Pro Gas Rules
Body and Chassis Rules
Must be factory VW STEEL complete
floor pan, stamped steel floor pans are mandatory and must be welded
to tunnel. Pan head must be in place. Pie cutting of pan head is allowed
for added caster.
Tubular chassis are NOT allowed
Narrowing of torsion Housing is allowed
Raising of torsion housing is allowed, Max-3 inches
Must retain factory frame horns, Frame horns may not
be modified in any way
1 inch transmission raise is allowed for all cars, including
raised torsion housing cars
9.0 inch maximum measured tire width
Wheelie bars may be used, 60” inch maximum length
NHRA engine oil containment pans or blankets must be
Roll bar or roll cage is mandatory and must be NHRA
Type-1 and type-3 are allowed bodies for
Karman Ghia Body is allowed
Convertibles are NOT allowed
Factory windshield angle must be preserved
No open air vehicles allowed, I.E manx type vehicles,
Max 4” chop top allowed
Minimum roof height-48 inches
NO Sectioning of body allowed.
NO Channeling of body allowed
Fiberglass fenders, doors and front ends are allowed,
no carbon fiber
Stock width fenders or wider mandatory
Rear fenders can be raised for tire clearance
Lexan windows are allowed
Deck lid is mandatory, Stock replacement fiberglass
deck lids may be used, aluminum fabricated deck lids are allowed.
Dragster style wings are NOT allowed
in this class. A wing of a single plane design is permitted. It must be mounted below the lowest point of the
rear window and not more than 42” wide. Maximum height to be no
more than 4” from it’s mounting point. Maximum gap between
body and spoiler 1”.
Wings/spoilers are allowed a max of two 48 square inch openings on top of the wing/spoiler. No air ducting above or below the openings is allowed. Air flaps on the back of the engine cover is allowed.
Stock deck lids will be allowed a maximum of 6 inches lay back/stand off from the factory position. Deck lids are not allowed to be any higher than the lowest part of the rear window. Deck lids must be securely latched at bottom.
Non factory air induction, I.E. Naca Ducts, ducted air through scoops, under vehicle chassis,windshields is not allowed. For cars with non factory engine covers, follow wing/spoiler rules for allowable air vents. Cars that have air induction from racing in another class must show sufficient proof that air induction is disabled or car will not be allowed to race in class. If vehicle owner is caught modifying air induction before or after a round, vehicle owner and car will be disqualified and loss of payout and points will be implemented.
Pressure boxes and OR Carb trays are NOT
Single knob adjustable rear and front shock may be used,
must be commercially available
Aftermarket torsion bars and spring plates are allowed,
must be commercially available.
Spring plates must be factory length.
NO electronic or pneumatic shock controllers
Narrowed axles are allowed
IRS suspension is allowed
Shifter and Clutch
H-Pattern shifter is the only shifter allowed
NO Vertigate style shifters allowed
NO electronic type shifter allowed
Allowable Clutch engagement is by cable or hydraulic,
I.E Neal/CNC pedal assembly
Clutch release has to be foot operated only, NO
air activated, solenoid activated clutch release allowed
Hydraulic or manually activated clutch management is
Allowed transmission- Type-1, Type-2, Mendeola
NO Sequential shifted type transmissions
IRS to Swing axle conversion “Dave Folts”
kits are allowed
Swing axle or IRS suspension only
NO coil over/ladder bar type suspension
Minimum Weight limit for CB 044 Pro Gas is set at 1725
. There will be a 25 lb weight penalty
for raised torsion housings. The weight penalty rule for CB 044 Pro Gas
is subject to change if PRA deems necessary.
2332cc Max Engine Displacement
84mm stroke max, Any manufacturer,
may be flanged, wedge-mated, any main bearing dimensions O.K, min 2"
rod journals, crank may be turned for repair, No offset grinding, No
knife edging of crank is allowed.
Rods - Steel rods only, any manufacturer
allowed, minimum rod length is 5.325, maximum rod length is 5.700, .866
I.D pin bushing only.
Push rods - Steel only, any manufacturer
94mm bore max
Flat top piston only any manufacturer,
any ring type allowed, 3 ring grooves Mandatory, No gas porting allowed,
Minimum compression height-1.300, Minimum piston weight with pin- 475
grams, Valve relief’s are allowed.
Wrist Pins - Minimum wrist pin wall
thickness-.120, Steel wrist pins only, .866 wrist pin diameter only.
CNC Wedge Port head
as SPEC head for class. Heads must
use components that are sold with the #1411 Wedge Port head,
exceptions. Springs may be shimmed for proper installed height. Installed
valve spring height must remain within 1.500-1.530, NO exceptions. Any
depth flycut allowed, welding between chambers allowed for strength
when heads are flycut. Welding of head in any other areas other than
between combustion chambers is Not allowed. NO modifying, porting or
blending of ports is allowed, NO modifying, un-shrouding, or blending
of chambers is allowed. If seats are replaced to repair heads, intake
seat I.D must remain at 1.530, exhaust seat I.D must remain at 1.320.
Valve seat depth must remain at factory height if seats are replaced.
NO shortening or profiling of valve guides is allowed. Intake manifold
stud location may NOT be relocated.
Servicing of heads - If heads are serviced,
all parts must be factory CB #1411 Wedge Port replacement parts, NO
Rev Control - NO Internal or External
rev kits allowed to control valve train.
Intake manifold - Accepted manifolds;
CB Performance- IDA#3155 / IDF#3157,
JAYCEE #S-8 ALLOWED STARTING IN 2016, Berg-
IDF#GB580A / IDA#GB590 Scat- IDA#30122 IDF#30076 Manifolds may be welded
up to 1-1/2 inches from base ONLY to allow match porting and strength,
Manifolds may be match ported. Epoxy of any Kind is not allowed internally
or externally on manifolds.
Valve and seat angles - Seat-30/45/60/75
degrees only. Valve-30/45 degrees only.
Rocker arms - max 1.5 ratio, any manufacturer,
keep in mind that the valve springs are only capable of .630 lift.
Valve Springs - Valve springs may NOT
be modified in any way. Replacement valve springs must be CB part# VW650
Cam - must be flat tappet cast iron
cam any manufacturer is allowed
Cam gear - any manufacturer
Ignition - any type of distributor
CRANK TRIGGER IGNITION IS ALLOWED STARTING IN 2016, PROGRAMMABLE CRANK TRIGGER CDI IGNITION BOXES ARE NOT ALLOWED. any manufacturers coil allowed, Locked timing or mechanical advance only, No timing control.
Case - stock magnesium or Auto Linea
Oil pump - Full flow style only, no
dry sumps, external oil bypass allowed
Oil sump - any manufacturer allowed
Exhaust - any manufacturer allowed
and any size allowed, step headers are allowed. NO over the top exhaust
Carburetion - 48mm throttle plates
max, 44mm venturi max, No Mechanical Injection allowed, No EFI allowed,
Approved carburetors for class- Spanish or Italian Weber 48 IDA/IDF,
Dellorto 48 DRLA, No carb modifications allowed to improve air flow,
Aftermarket velocity stacks O.K, float bowl enlarging O.K
Lifters - cast iron only, no composite
lifters allowed, must be standard VW O.D dimensions, Minimum lifter
weight is 70 grams
Clutch - Stock style and J&G clutches and RLR Rev-6 are the only clutches allowed.
R6PG2016 -Rev-6 Clutch rule amendment starting in 2016
The Pro Gas Rev-6 clutch is not to be modified in shape; size, weight and or any other way except for maintenance due to wear from the disc, any repairs other than maintenance must be approved by CB Performance and/or RLR.
The units are to remain 6.250", single clutch disc, and no modifications to the clutch disc other than truing (grinding) for maintenance purposed are allowed.
The clutch units are serialized and numbered for identification purposed and must have the appropriate Pro-Gas designation to be used in competition.
Any units previously purchased and meeting the criteria described above and needing the Pro-Gas designation applied to their Rev-6 clutch can have that done at no cost by RLR.
Clutch Disc - Single disc ONLY, any diameter allowed, any manufacturer allowed. For the RLR Rev-6, the clutch disc must be the spec disc for Pro Gas, no other clutch disc is allowed when using the RLR Rev-6 clutch.
Flywheel - Must use steel flywheel,
12 lbs. min weight, 17 lbs Max flywheel weight, Flanged flywheels O.K
Fuel - VP C-12 will be the spec fuel
for the class
Vacuum pumps are NOT allowed
Nitrous Oxide is NOT allowed
Data Acquisition - Data acquisition
of any kind is NOT allowed. Competitors will need to remove oxygen sensors from exhaust systems before qualifying and elimination rounds begin. Competitors using data log computers, Race pack, etc will have to remove SD memory cards from the computer before qualifying and elimination rounds begin. If the data log computer does not use an SD memory card, competitor will need to show proof that the data log computer is disabled prior to qualifying/elimination rounds.