As of 3/18/2008
- Current changes have been marked with **
NOTE: These changes leave NO GREY AREAS. If you
feel there is a grey area or have ANY questions about the rules
at any level, please contact track management at 901-508-6200
for clarification.
Non Winged Sprints MUST
run full sized Nerf Bars
**Minimum Weight 1375#
**Right Rear Tire to Punch 38 on Durometer
Chapter 15: General Engine Rules
316 max cubic inch limit/ 3.48 max stroke
All engine components must be of ferrous material only. No
titanium or ceramics.
15.1 Engine Block
15.1.1 OEM production cast iron 305 Chevrolet only (no
aftermarket). Ford 302??
15.1.2 No repositioning, boring, or bushing of cam or lifter
bores.
15.2 Crankshaft
15.2.1 OEM production crank or ANY brand of
3.480 stroke w/stock weight. (balancing only no “knifing”)
15.3 Connecting Rods
15.3.1 Any OEM or aftermarket stock length (5.7”Chevrolet “I”
beam rod. ) No billet allowed.
15.4 Pistons
15.4.1 Any flat top two or four valve relief allowed.
15.4.2 Max “0” deck height (Piston may not protrude above deck
surface)
15.4.3 Any piston rings.
15.5 Valve Train Specs
15.5.1 Timing sets - Chain only. No belt or gear drives allowed.
15.5.2 Valve springs straight wound only max seat pressure
120lbs. Must
have 5 full coils.
15.5.3 Any flat tappet lifter with max diameter of .842 for
Chevy & .875 for Ford. NO roller or mushroom style lifters
allowed.
15.5.4 Any 5/16 diameter pushrod.
15.5.5 Any steel 7 or 10 degree valve spring retainer
allowed.
15.5.6 Stamped steel or roller rocker arms allowed. No shaft
systems, rev kits, stud girdles, or valve stabilizers allowed.
15.6 Oiling System. Wet Sump Only (No Dry Sump allowed).
15.7 Camshaft
15.7.1 Flat Tappet only/No Rollers. No “hard face” cams.
15.7.2 Chevy's must utilize stock firing order (18436572)
15.8 Valves:
15.8.1 2.02 intake/1.60 max head diameter allowed.
15.8.2 11/32 valve stem diameter only. NO titanium valves.
15.9 Cylinder heads:
15.9.1 Cast Iron only, no modifications allowed to the port,
bowl, or chamber area. Minimum chamber volume is 64cc for
Chevrolet and 58cc for Ford engines. The only stock VORTEC head
allowed is the 350 Vortec. Any GM stock head with minimum 64cc
chamber is allowed. No grinding, polishing, welding, acid or
caustic work, shot peening, glass beading, coating, or other
process that will alter the machined surfaces or natural sand
cast finish. Heads must be untouched. Comparisons will be made
to known legal heads if questions arise. The only exception
allowed to this rule will be when media blasting has been used
for cleaning purposes only. This determination will be made by
the tech inspector(s). Any questionable parts may be presented
to track management for inspection prior to assembly to avoid
possible issues later.
15.10 Approved cylinder head castings:
15.10.1 Small Block Chevy:
15.10.1.1 RHS Pro Action p/n 12319. (200 runner, 2.02 / 1.60
valves, 64 cc chamber, straight plug)
15.10.1.2 RHS Pro Action p/n 12320. (200 runner, 2.02 / 1.60
valves, 64 cc chamber, angle plug). ** Part number 223400000 or
223400000A stamped in the accessory bolt mounting flange on one
end of the head, also has 200 in casting under valve cover.
15.10.1.3 Dart Iron Eagle p/n 10320010 or 10230010P. (200
runner, 2.02 / 1.60 valves, 64 cc chamber, straight plug) --Part number stamped in the accessory bolt mounting flange on one
end of head, also has 200 in casting under valve cover.
15.10.1.4 Dart Iron Eagle p/n 10310010 or 10310010P. (200
runner, 2.02 / 1.60 valves, 64 cc chamber, angle plug). --Part
number stamped in the accessory bolt mounting flange on one end
of head, also has 200 in casting under valve cover.
15.10.1.5 World Products Motown p/n 011250. (200 runner, 2.02 /
1.60 valves, 64 cc chamber, straight plug). --Part number in
casting under valve cover.
15.10.1.6 World Products Motown p/n 011150. (200 runner, 2.02 /
1.60 valves, 64 cc chamber, angle plug). --Part number in
casting under valve cover.
15.11 Fuel System
15.11.1 Injectors or carburetor allowed
15.11.2 Cam drive fuel pump only
XX Gear Rule
-All cars will run the same final drive ratio of 6:68. All cars will be
required to have a minimum ¼” inspection hole drilled in the
driveline tube positioned in such a manner to allow verification
of above mentioned final drive ratio. This will allow the cars
to turn in the 6,500 to 6,800 RPM range which should then make
it unnecessary for the racer to “overbuild” the engine.
Any violation of engine rules will result in disqualification of
the car and driver for the remainder of the year.
Cars must be affixed with a safety strap on drag link.
Network with 5 tracks: North Alabama; Beebe; Atwood; Malden; and
RIS.
The halo bars on the 305’s are optional.
