2017 Semi-Late Model Sportsman Rules
(limited/crate/steel block Im)
All cars must have wrecker hookup. All cars should have 5-pound minimum fire extinguisher in reach of driver. All drivers should wear flame retardant fire suit, shoes and gloves. Window nets are highly recommended for all cars. No radios, communication equipment or mirrors permitted, including pit boards. No computer controlled equipment.
Weight Category Summary
Car must meet all specific rules for the weight category plus all general car rules. Rules cannot be mixed between weight categories.
2,200 – 602 or 604 Crate (rules 1-23 & 24-33)
2,350 – Econo 355 (rules 1-23 & 34-39)
2,400 – Limited 360 (rules 1-23 & 40-45)
Rules 1-24 apply to ALL CARS!
Weight limits may be adjusted during the season for competition.
ALL CARS-VB motors only. Motor must be based on factory design and naturally aspirated. 1 spark plug and 2 valves per cylinder.
No titanium or exotic metals except titanium retainers-OK. No fuel injection, turbo chargers or blowers.
ALL CARS-Headers permitted. Exhaust pipes may NOT point towards ground. Mufflers are HIGHLY recommended for all cars. Exhaust system should be mounted in such a way as to direct gases away from the cockpit of the vehicle.
ALL CARS-Gasoline or alcohol. No nitrous oxide, nitro-methane or propylene oxide. No electric fuel pumps or pressurized fuel systems .Mechanical or belt-driven fuel pumps only. Fuel lines should not pass through driver’s compartment.
ALL CARS-Any battery powered ignition, MSD, Acee!, Mallory or equivalent system permitted. No coil pack or individual cylinder systems.
ALL CARS-11″ maximum tire tread width. 16 3/4″ maximum cross section. Tire hoop must pass freely over tire. 93″ maximum circumference. Tires must have all manufacturer’s stamps intact. 32 minimum tire hardness after race, verified by durometer. Only American Racer 44, Hoosier 15/1300 or harder compounds permitted-no softer compounds allowed on all wheels except inside front tire may be open compound. Hoosier D21, D55, FT200, FT400 and FT600-0K. American Racer Crate 44, 48 and 56-0K.
The track durometer is the official measuring device. 11″ maximum circumference grooving-no tolerance. No buffing or taping over tire size markings.
ALL CARS-14″ maximum steel or aluminum wheels only. No plastic wheels, fiberglass or carbon fiber wheels. Bead locks allowed. Wheels must be held on by bolt-type lug nuts, no knock-off type mounting permitted. 90″ maximum outside width at wheels with wheels pointed straight. Foam wheel plugs are recommended if wheel plugs/covers are used.
7. TRACTION CONTROL
ALL CARS-All traction control devices using wheel sensors are NOT permitted. Adjustable ping control devices, dial a chip controls, timing controls or automated throttle controls are NOT allowed in the cockpit or any other location accessible by driver. Any remote control components or data acquisition equipment are NOT permitted.
8. REAR AXLE
ALL CARS-Any rear end permitted. Quick change-OK. No live-axle rear ends. Aluminum axle tubes permitted. Only floater wide-five hub assembly permitted.
9. TRANSMISSION AND DRIVE SHAFT
ALL CARS-Any aluminum or steel transmission permitted. Racing and automatic transmission–OK. Transmission and clutch should have explosion-proof bell housing or 358 degree ‘!.” steel scatter shield securely mounted to car. Any type clutch permitted and clutch should have scatter shield. Multi-disc clutch permitted and can have aluminum bell housing. No in and out boxes. Transmission should be bolted to the motor and must have working reverse gear. Only one drive shaft permitted. All drive shafts should be painted white and should be surrounded by two 3″ steel safety loops or sling mounted to frame.
ALL CARS-103″ minimum wheelbase. All frames should be constructed of 2″x 2″ square steel tubing or 1314” outside diameter round steel tubing, with .083″ minimum material thickness All round tubing frame cars should use 4130 chrome molly steel or DOM in frame construction . No holes may be cut in frame. All other chassis tubing should 1%” at outside diameter and have a minimum thickness of .083″ .Car should have horizontal safety bar constructed from same steel tubing as frame, mounted behind fuel cell and securely welded to frame. Rear bumper should be at least 4″ behind fuel cell. Center of rear bumper and safety bar should be at rear deck center height approximately 19″ from the ground and should be at least as wide as frame. Tubing should also extend downward to form a horizontal bar at the bottom height of the fuel cell, with additional vertical and diagonal tubing bracing the lower tubing to the rear bumper and the safety bar. Lower tubing should be at least as wide as fuel cell. No part of the fuel cell should be below the protective tubing. Any rear bumper that extends more than 8″ from the rear of frame should be rounded and directed toward the front of car. Bumper should not have sharp edges. No external rub rails.
ALL CARS-No straight front axles. Coilovers-OK. Suspension must be mechanical-no computer or electronic components. Front suspension must be stock configuration. No center steering. No torsion bar suspensions Shocks must be steel or aluminum. No through-rod crossover/tandem or inerter shocks. No shocks that can be adjusted electronically through cell phone apps or other remote controls.
ALL CARS-Body must meet all specifications listed on diagram. Super late model type, full bodied cars only. All body panels must be solid no holes, gaps, slots etc. Body line must be a flowing line from front to rear. 40″ maximum front fender and door height. 48″maximum rear quarter panel length measured from center of rear wheel. Ground clearance should be 3″ minimum. Wheel clearance should be 2″ minimum. No ridges, fins or raised edges on body except roof bead rolls. 40″ maximum deck height at rear at all points regardless of tilted angle of body, WITH NO TOLERANCE!
Fenders must be level from side to side. Quarter panels must be same length and cannot extend higher than rear deck. Rear deck must be level 20″ forward from rear of quarter panel and must extend between quarter panels. Rear deck may not extend past quarter panel and top to bottom of quarter panels must extend to rear of deck. Quarter panels and doors may not dish inward. Skirting may not extend behind quarter panel. Left rear quarter panel must extend downward from deck minimum 33″ with plastic skirt at all points.
Right rear quarter panel must extend down from deck minimum of 31″ with plastic skirt or 27″ without plastic skirt at all points.
76″ maximum body width at top deck. 82″ maximum body width at bottom of doors measured at the center of the car. 86″ maximum width at rear of quarter panels from bottom to 19″ from ground. All body width variations must taper evenly on both sides.
All fenders, doors and quarter panels should roll inward %” to 1″ at top, with sides over upper body. No sharp or jagged edges, fasteners, etc. No wings or tunnels permitted under body or chassis. Unapproved bodies may be assessed a 50-pound weight penalty.
ALL CARS-Approved roof and roof supports should match nosepiece. Minimum 44″ long x 48″ wide, maximum 54″ long x 52″ wide. 45″ minimum height from ground, 48″ maximum. Roof must be mounted near center of car, parallel to the deck and level. Roofline and side panel window contours should be stock appearing and match nosepiece. Roof Line MUST be rounded-no flat, wedge, bellied or hollow roofs.
Rear roof and front roof supports mandatory. Rear roof supports may extend 43″ from rear of driver’s side window. Rear roof
Supports must taper downward evenly from outside edges of roof with a 2″ maximum outward bow both to the sides and rear. 17″ maximum at top of rear roof support. 10″ high x 15″ long minimum rear support window is optional and recommended for appearance. Rear support window may be filled with clear Lexan. 2″ minimum front roof post width, 4″ maximum. Front roof post bracing may extend 7″ vertical and horizontal. Front roof posts must extend forward to the rear of hood. %” maximum bead rolls permitted on roof running from front to rear in direction, 4 maximum including edge bead rolls.
Door window opening height should be minimum 12″ measured from deck to roof. 1.5″ maximum roll down permitted along front and rear edge of roof. Roof may not turn upward. 4″ maximum hinged sun shield permitted in front of driver. 25-pound penalty for unapproved roofs.
14. NOSE PIECE, FENDER FLARES AND HOOD
ALL CARS-Approved stock appearing molded nose piece required and should match roof and roof supports. Nose piece must be made of flexible material. 15″ minimum nose piece height measured from bottom of nose piece to where sheet metal is attached, following the angle of the nose piece. Nose must be mounted level. 2-piece nose cannot be widened. 52″ maximum nose piece extension Measured from center of front hub with wheels turned straight. 3″ minimum ground clearance. Nose piece may not be modified or cut. Unapproved nose pieces may be assessed a 50 to 125-pound penalty. Tech inspector may require that any unapproved nose piece must be changed.
37″ maximum front fender height from ground. Plastic front fender flares permitted, but cannot alter original shape of nose piece and must have collapsible support (no steel supports). Fender flares may extend 1″ outside front wheels when pointed straight. 90″ maximum fender flare width. Fender flares may extend maximum 2″ above fenders. Hood must be level from side to side. Scoop may be maximum of 1″ above air cleaner. No raised edges on scoop.
Spoiler measurements may be adjusted during the season for competition.
ALL CARS-Spoiler and braces must meet all specifications listed on diagram. 72″ maximum width. Maximum 3 solid side spoilers permitted. Side spoilers must be mounted at rear of deck and outer side spoilers must be at outside edge of deck. Side spoiler must taper down evenly from maximum to minimum height and may be rounded or triangular in shape. 2 additional 1″ open aluminum braces permitted. Spoiler should be clear Lexan or aluminum. No driver-adjustable spoilers. Spoiler must be mounted at rear of deck. Spoiler may not be suspended to create a wing. No other spoilers or wings.
ALL CARS-All cars must have 4-wheel braking system. Steel brake rotors only. No plastic brake lines. Steel braided brake lines-OK.
17. STARTER AND BATTERY
ALL CARS-All cars must be self-starting. Failure to start during a race will result in disqualification. Battery should be located in a safe area and covered with a metal fireproof box. Battery should not be in driver compartment. Battery disconnect kill switch to shut down motor highly recommended mounted in reach of driver and should be clearly labeled for safety crew.
18. FUEL CELL
ALL CARS-Racing-approved fuel cell should have 35- g a 1 1 o n maximum capacity and should bE -securely mounted inside a 20-gauge steel or .060″ aluminum metal box and secured to frame with a minimum of two 2″ x 1/8″ thick steel straps around entire fuel cell. Minimum 7/16″ bolts should be used to mount the fuel cell. The fuel pick up should be on the top or right side of the fuel cell, be constructed of steel and should have a check valve in case of roll over. Fuel cell should be mounted in square tubing frame. Fuel cell should be mounted behind the rear axle and between the rear tires, at least 4″ in front of the rear bumper. 9″ minimum fuel cell ground clearance. No part of the fuel cell should be lower than the rear end housing. Car number must be displayed on fuel cell, 6″ minimum height. No pressurized fuel systems.
19. ROLL CAGE
ALL CARS–4-post box-type roll cage should be constructed of 1 %” minimum outside diameter and .095 minimum material thickness steel tubing. Roll cage should have at least 3 horizontal bars at driver’s side door and 2 horizontal bars at passenger side door, extended outward into door panels with 2 vertical bars between each horizontal bar as additional support. An extra vertical side brace bar is recommended on the left side in line with steering wheel. Door bars should be 1 %” in diameter with a minimum thickness of .065. Both door window areas should remain open and unblocked by roll cage bars for easy exit. Roll cage should extend forward on driver’s side to protect foot area completely. Roll cage should be welded to frame in at least 6 places (in addition to diagonal bracing) and welded together at all intersecting points. Diagonal bars should brace roll cage at rear, and should run from frame to top of roll cage.
ALL CARS-Top of roll cage should be at least 2″ above top of driver’s helmet. All areas of the cockpit should have at least 11″ to 12″ of clearance below the roll cage and roof. All roll cage bars within reach of driver should be covered with non-flammable foam padding certified to SFI spec 45.1. Other than padding, roll cage must remain exposed above top of door with no aerodynamic effects. Right side padded headrest or head net recommended attached to roll cage. Bars or wire mesh in windshield and driver’s side quick release window net certified to SFI spec 27.1 are highly recommended.
20. FIREWALLS AND INTERIOR
ALL CARS-A full metal firewall constructed from 18-gauge steel or 1-1/8″ thick aluminum should be joined to seal off driver compartment at front, rear, sides and floorboard. Full metal floorboard. Top of interior may be maximum of 3″ below top of doors. The start of the dropped interior should remain closed as part of the firewall. The interior must taper up gradually to be even with the rear quarter panel and level for 20″ from rear of deck and quarter panel. Interior must be mounted flush with outside body panels. Interior clearance should be 11″ to 12″ minimum below roll cage at all points for easy exit. On board fire suppression system recommended.
21. SEAT AND SAFETY BELT
ALL CARS-Full containment, metal racing-approved seat with padded headrest should be securely attached to frame. 3″, 5, 6 or 7-point, quick release racing belt with double harness certified to SFI spec 16.1. 7-point system is highly recommended. Seat and belts should be mounted to the chassis with grade 5 or better hardware. Mounts should run in the same direction to secure the belt. Belt should not come in contact with sharp edges. Safety belts should be replaced if 2 years old, and all worn or damaged safety belts should be replaced. Quick-release, racing-type steering should be used.
22. FIRE SUIT AND HELMET
ALL CARS-Drivers should have flame retardant fire suit certified to SFI spec 3.2A/5 and racing approved full-face helmet with face shield certified to Snell SA2000, SA2005 or SA2010 standard or SFI spec 31.1A, 31.1/2005 or 31.1/2010. Gloves certified to SFI spec 3.5/5 highly recommended. Nomex shoes. Socks and hood highly recommended. Head and neck restraint system certified to SFI spec 38. 1and arm restraints are highly recommended.
Weight limits may be adjusted during the season for competition.
ALL CARS- Weight limits are after race and include driver. All weights should be solid material, entirely painted white or a bright color and marked with car number. Each weight should be 50-pound maximum. Weights should be bolted to frame with two ‘!.” Grade 5 bolts on two weight clamps or secured with steel plate. Weights should be attached below the body decking. No weights should be attached to rear bumper or in driver’s area. Weights should not be lead pellets or liquid. Each weight should be bolted to the frame individually and should not be stacked on another weight.
RULE BOOK DISCLAIMER: The rules and/or regulations set forth herein are designed to provide for the orderly conduct of racing events and to establish minimum acceptable requirements for such events. These rules shall govern the condition of all events, and, by participating in these events, all participants are deemed to have complied with these rules. NO EXPRESSED OR IMPLIED WARRANTY OR SAFETY SHALL RESULT FROM PUBLICATIONS OF OR COMPLIANCE WITH THESE RULES AND/OR REGULATIONS. They are intended as a guide for the conduct of the sport and are in no way a guarantee against injury or death to a participant, spectator or official. The race director shall be empowered to permit reasonable and appropriate deviations from any of the specifications herein or impose any further restrictions that in his opinion do not alter the minimum acceptable requirements. NO EXPRESSED OR IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM SUCH ALTERATION OF SPECIFICATIONS. Any Interpretation or deviation of these rules is left to the discretion of the officials. Their decision is final.
2017 Semi-Late Model Sportsman
Rules 1-23 and 24-33 apply to Crate 2,200 weight cars!
24. MOTOR (all rule 1 specifications apply)
8″ maximum setback measured from center of left front spark plug to center of ball joint.
GM 602 CT350 crate motor part number #19258602 or #88958602. GM 604 CT400 crate motor part number #88958604 or #19318604. Motor must meet all specifications in the GM spec document for that motor. No vacuum pumps. No RM bolts! Original
GM, Crate USA and FASTRAK seals only. Rush seals permitted on 602. Motor must be purchased from an authorized dealer and MUST remain sealed at all times. GM factory encrypted bolts cannot be altered, removed or changed except by an authorized repair center. .Absolutely no modification of any internal engine part. All motor parts included with the motor as shipped from GM must remain OEM and may NOT be modified including but not limited to: intake manifold, heads, valve covers, front cover, oil pan harmonic balancer or any other part on or in the motor. No upgrades are allowed that may produce power via performance enhancing methods including breather system modifications. No machine work permitted. Any motor modification will result in one-year suspension and loss of all points and winnings. Any GM bolts that have been copied is considered trademark infringement and will be reported to the manufacturer for legal proceedings. By using a crate motor in competition, the race team acknowledges all responsibility for the legality of the motor upon inspection at any event regardless of any previous motor verification.
GM 602 and 604 crate motors with original factory seals may not be protested. GM 602 and GM 604 motors with original factory seals may be claimed for the amount listed in the procedure rules as it came in the crate, not including any bolt-on items. Refusal to accept claim will result in disqualification fine and suspension. A car must compete in the feature to have its motor claimed. Claims must be submitted in writing within 15 minutes of completion of feature. Motor service or reassembly after tear down may only be performed at an authorized repair center and motor must be resealed with GM factory encrypted bolts. All motor repairs must be done with the same GM motor parts, listed in GM book part #88958668. Rebuilt motors are subject to protesV tear down or claim.
25. DISTRIBUTOR (all rule 4 specifications apply)
604 Crate 2,200 and 602 Crate 2,200 weight- Any battery powered ignition, MSD, Acee!, Mallory or equivalent system permitted. No crank trigger, distributor less, multi-coil or magneto systems.
One 2 or 4-barrel open carburetor
27. BODY (all rule 12 specifications apply)
604 Crate 2,200 and 602 Crate 2,200 weight cars will receive a 2″ tolerance on quarter panel length and top deck width. 2″ tolerance on top deck width between wheels.
28. ROOF (all rule 13 specifications apply)
604 Crate 2,200 and 602 Crate 2,200 weight cars will receive a 5″ tolerance on the front roof post bracing.
29; NOSEPIECE, FENDER FLARES AND HOOD (all rule 14 specifications apply)
604 Crate 2,200 and 602 Crate 2,200 weight cars will receive a 2″ tolerance on fender flare height, fender flare width and nosepiece length.
30. SPOILERS (all rule 15 specifications apply)
604 Crate 2,200 weight and 602 Crate 2,200 weight-12″ maximum vertical spoiler height measured from top of rear deck and 12″ maximum spoiler length measured along the angle of the spoiler. 12″ maximum side spoiler height from rear of side spoiler to 10″ forward of rear of side spoiler. 4.5″ maximum height at front of side spoiler. 24″ maximum side spoiler length. 4″ high x 32″ long spill board with 1″ ridge on top permitted on the nosepiece. Spill board measured at mounted angle. No other ridges allowed on the nosepiece.
31. FRAME (all rule 10 specifications apply)
604 Crate 2,200 and 602 Crate 2,200 weight cars will receive a 1″ wheel base tolerance.
32. SUSPENSION (all rule 11 specifications apply).
604 Crate 2,200 and 602 Crate 2,200 weight-Any type steel or aluminum shocks allowed.
33. WEIGHT (all rule 23 specifications apply)
GM 604 CT400 Crate motors-2,200 pounds. No tolerance.
GM 602 CT350 Crate motors-2,200 pounds. No tolerance.
2017 Semi-Late Model Sportsman
Econo 355 2,350
Rules 1-23 and 34 – 39 apply to Econo 2,350 weight cars!
34. MOTOR (all rule 1 specifications apply)
Econo 2,350 weight-Cast iron block and heads. 11:1 maximum compression ratio. Max cubic inch limit: Chevrolet 355, Ford 357, Mopar 366 .030 maximum overbore. Flat tappet cam only. No roller cams. No roller radius or mushroom lifters. Roller rockers-OK. 6″ maximum setback measured from center of left front spark plug to center of ball joint OR 25 %” maximum setback measured from center of ball joint to front of motor plate.
Econo 2,350 option 2 motor-Cast iron block. 362.5 maximum cubic inch limit. OEM 23-degree head valve angle. Flat top pistons only. Flat tappet cam with .333 max lift measure at the cam. 1.5 rocker ratio. 6″ maximum setback measured from center of left front spark plug to center of ball joint OR 25 ‘!.” maximum setback measured from center of ball joint to front of motor plate.
35. DISTRIBUTOR (all rule 4 specifications apply)
Econo 2,350 weight-Only single distributor or magneto permitted.
Econo 2,350 weight-One 2 or 4-barrel open carburetor.
37. SPOILERS (all rule 15 specifications apply)
Econo 2,350 weight- 8″ maximum vertical spoiler height measured from top of rear deck and 8″ maximum spoiler length measured along the angle of the spoiler. 8″ maximum side spoiler height from rear of side spoiler to 6″ forward of rear of side spoiler. 4.5″ maximum height at front of side spoiler. 18″ maximum side spoiler length.
38. SUSPENSION (all rule 11 specifications apply)
Econo 2,350 weight- Only non-adjustable oil shocks permitted.
39. WEIGHT (a// rule 23 specifications apply)
2,350 minimum weight for Econo 355 ci cast iron head motors meeting all listed specifications .
2017 Semi-Late Model Sportsman
Rules 1-23 and 40-45 apply to Limited 2400 weight cars!
40. MOTOR (all rule 1 specifications apply)
Limited 2400 weight-360 cubic inch limit. Block must be standard factory production or aftermarket cast iron block that was originally less than 360 cubic inches. Chevrolet Bowtie, Mopar-R and Ford SVO blocks-OK. All factory ID letters and numbers must be on blocks. 6″ maximum setback measured from center of left front spark plug to center of ball joint OR 25 %” maximum setback measured from center of ball joint to front of motor plate.
Any Limited 2400 weight car with CNC lightened heads or CNC lightened block must mount a 20-pound weight on or in front of the motor mid-plate for 1 of those parts and 40 pounds of weight on or in front of the motor mid-plate for 2 of those parts.
Flat top pistons only with 0 deck tolerance-pistons may not be above the block. OEM or aftermarket steel crankshafts only with 46-pound minimum weight. Crankshaft must retain stock stroke for make and model. 3.5″ stroke crankshafts-OK. Ford SVO #M6303-H351 and Mopar #P4120312 crankshafts permitted. Crankshafts may be turned to maximum of .040″ undersize. No lightweight crankshafts. Flat tappet cam only-no roller or mushroom cams. Lifter bores must remain stock. No needle bearing cam, crankshaft or rod bearings permitted. No cam belt drives or externally adjusted cam timing devices.
Any approved intake except smoke or tunnel ram. Any stock dimension steel connecting rod. No titanium rods. Aftermarket
Steel connecting rods-OK. 6 inch connecting rod permitted on all motors. All 358 engines must have a %” inspection hole in the left side of the oil pan opposite the number one rod journal OR oil pan must be removed for inspection.
Engine setback: Forward most spark plug behind the upper ball joint not to exceed 6″ measured from center line of spark plug to center line of upper ball joint
Dart/World Products Sportsman II or Roush 200 with casting number i-037 for GM and i-051 for Ford, Chevrolet Bowtie and Vortec (except Vortec #25534421 -#25534351 and #25534445 -#35534371), Mopar W2, Ford N or any factory production cast iron heads allowed with the following specifications: No aluminum heads. No head angle milling. Combustion chambers can be ground or polished on heads, but must have 60 cc minimum. Rocker arm studs may not be relocated. Shaft-style rocker systems-OK. Port matching on the head intake runner is acceptable up to maximum %” depth from the intake manifold interface and on the head exhaust runner up to maximum %” depth from the head interface. Valve seat area can be cleaned up and blended no deeper than%” from the seat. Head runner CC measurements must remain stock with the exception of port matching. No other hand or machine work on ports permitted on heads! Steel or stainless steel valves only-no titanium or hollow stem valves. Any spring, any retainer and any valve lock permitted including titanium. Roller rocker arms permitted.
Vortec #25534421 -#25534351 and #25534445 -#35534371, RHS ProAction #35301, #35302 or #35303, World Products Windsor Sr i -061 and Dart Iron Eagle #13310010 , #13410010 or #13520020 cast iron heads allowed with the following specifications: No aluminum heads. 60 cc minimum combustion chamber with NO grinding in chamber. No relocating rocker arm studs. No porting or polishing except port matching on the head intake runner is acceptable up to maximum %” depth from the intake manifold interface only. Valve seat area can be cleaned up using a maximum 80-degree grinding stone. CC measurement of intake runner of head to remain stock with the exception of intake port matching to the intake manifold runners. No additional hand or machine work of any kind permitted on heads! Any steel or stainless steel valve. No titanium valves. Any spring, any retainer and any valve lock permitted including titanium. Stock valve guide angle. No relocating valve guides. Roller rockers permitted.
41. DISTRIBUTOR (all rule 4 specifications apply)
Limited 2400 weight- No magnetos.
One 2 or 4-barrel open carburetor.
43. SPOILERS (all rule 15 specifications apply)
Limited 2,400 weight-8″ maximum vertical spoiler height measured from top of rear deck and 8″ maximum spoiler length measured along the angle of the spoiler. 8″ maximum side spoiler height from rear of side spoiler to 6″ forward of rear of side spoiler. 4.5″ maximum height at front of side spoiler. 18″ maximum side spoiler length.
44. SUSPENSION (all rule 11 specifications apply).
Limited 2400 weight-Any type steel or aluminum shocks allowed.
45. WEIGHT (all rule 23 specifications apply)
2400 minimum weight fo