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53 w i s s o t a . o r g © 2009 WISSOTA Promoters Association 2 0 0 9

mobile, AMC or other engines allowed. See section 1 general rules, 1.1 general application.

A. No aluminum or aftermarket blocks allowed. No splayed or aftermarket main caps

allowed. No turning a block that wasn’t produced as a 4 bolt main into a 4 bolt main

block. No grinding or polishing of any kind allowed to block. The two rear oil return holes

in lifter galley can have the flashing ground out of the hole only.

B. All cars must be equipped with an engine with a stock stroke. No intermingling of

crankshafts, rods or pistons to change stroke. Crankshaft and connecting rods must be

O.E.M. to block with no lightening, grinding, knife edging or polishing of any type. No

marine parts. Absolutely no strokers. Balancing is allowed. No after-market rods or crank

shaft. No aftermarket harmonic balancers allowed. Stock balancers only. Balancer may be

degreed but must meet measurements below. No modifications of any kind allowed. No

283, 307 or 327 balancers allowed on any engine other than a 283, 307 or small journal

327. Minimum size 283-307 and small journal 327 is 6-1/8 by 3/4 inch thick. 305, 350

and large journal 327 minimum size is

6-3/4 by 1-3/16 inch thick. No fluid balancers. No hubs only - balancer must be two

piece. Floating wrist pins allowed.

C. The maximum engine over bore permitted will be .040 on the 360 Chrysler engine. On

Chevrolet, Ford and 340 Chrysler, the maximum over bore permitted will be .060.

Stock-type flat top or dished pistons only. Pistons must be below deck on all engines.

1. Chevrolet engines will be permitted a maximum displacement of 360.4 c.i.d.

2. Ford engines will be permitted a maximum displacement of 362 c.i.d.

3. 360 Chrysler engines will be permitted a maximum displacement of 367 c.i.d.

D. Distributors. Stock O.E.M. distributors only. Billet distributors allowed. No multiple-spark

boxes. No magnetos or dual-point distributors allowed. Any coil used must fit in stock

cap and must use stock coil cover. GM H.E.I. Distributor can be interchanged with Ford

and Mopar engines. Adapt-A-Cap is allowed.

E. Stock cast iron two or four barrell intake manifolds only. No aftermarket, marine, propane,

throttle body or fuel injected manifolds. No raised plenum truck manifolds. Absolutely no

reworked intake manifolds. No coating, painting, grinding, port matching, polishing or acid

porting work in the inside of the intake manifold. Center intake bolt holes may be drilled

to match 1987-1995 Chevrolet heads.

F. Cylinder heads O.E.M. only; no angle milling allowed.

1. No angle plug, vortex or camelback heads or comparable camelback heads

allowed on Chevrolet. Some of the casting numbers not allowed include: 186, 187,

414, 492, 461, 461X, 462, 432, 041, 040, 040, 370, 10239906, 14011083,

14096217, 10125320, 10208890, 12554290. Also, no A.R.D. heads, no GT40 or

magnum heads allowed.

2. No Bowtie, SVO, W2 or any other aftermarket heads allowed at any time.

3. No porting, polishing, grinding or port matching allowed at any time. Valve seats

may be ground no further than 1/4-inch below top of the seat.

4. Valve size must match head being used. No 2.02 intake valves on Chevrolet or

Chrysler. No 1.6 exhaust valves.

5. Stock ratio rockers only; no fulcrum roller or roller-tipped rockers allowed. No stud

girdles allowed. No guide plates allowed. Stamped steel rockers only. No

modifications of any kind allowed on rockers except oil hole may be deburred.

Valley pans allowed.

6. Valve springs must be the stock diameter for the cylinder head being used.

7. Engine must have stock rubber mounts or steel mounts and must be in stock location

for the type of engine being used. Must be eight (8) cylinder.

8. No titanium parts of any kind allowed.

G. Camshafts

1. Hydraulic camshafts and lifters only. No roller cams or roller lifters allowed. No

mushroom or step lifters allowed. No machining permitted to install cam or lifters.

54 © 2009 WISSOTA Promoters Association w i s s o t a . o r g 2 0 0 9

Must be able to remove lifter from top of lifter galley at any time. Bushing of lifter

bores is not allowed. Lifters must be steel or iron and must be free to rotate.

2. Any timing chain allowed. No gear drives allowed. Valve timing configuration and

firing order must match engine used. Example: Chevy 18436572.

H. Stock cast iron exhaust manifolds allowed. No center-dump manifolds allowed on

Chevrolet. Casting numbers also not allowed are 10168496, 10168494 and 12524289.

Stock replacement exhaust manifolds allowed for cast iron stock manifolds currently

allowed by rules. No other after-market or reworked manifolds allowed. No headers

allowed.

I. One (1) radiator only; must be in stock location. Aluminum radiator allowed.

J. No crank trigger ignitions allowed.

K. No vacuum pump/air pump allowed.

L. No bee hive-conical type valve springs allowed.

M. External cooling lines maximum of 2 lines from the back of the intake to enter into

thermostat housing or spacer. No other external cooling lines allowed.

N. All engines are allowed to run a valve train oil deflector.

O. No coating, painting or any other work to inside of intake manifolds, heads and block

lifter galley allowed.

P. Lifters must collapse a minimum of 100 thousands and be made of magnetic material.

Q. No external oil pumps of any kind allowed.

R. Starter must be in stock location.

S. Main cap girdle not allowed. Crank scraper not allowed.

A. Carburetion will be limited to one (1) stock Holley 500 CFM 2- barrel, part no. 4412,

with a 1-11/16-inch throttle bore. No grinding or polishing of any kind allowed. All

carburetor components must be for a 500 Holley. No milling or grinding of throttle shaft

allowed. Shaft must stay round. Choke can be removed but NOT the air horn. Must

have stock measurements.

B. Adapter plate - maximum thickness between carburetor and intake manifold with

gaskets and adapter will be one-and-three-eighths (1-3/8) inches. No high-performance

adapters allowed. Spacer opening must be perpendicular to the base of carburetor.

Aluminum spacer only. No adjustable spacers or sliders allowed.

1. Devices below carburetor designed to increase the flow of air are not permitted.

2. All air entering the engine will be required to enter through top of the carburetor.

C. Fuel must be pump gasoline only. 10% ethanol-enriched gasoline may be used. No

alcohol; no nitrous oxide, or nitro; no nitrous devices allowed. No methane or propolene

oxide allowed.

D. No electric fuel pumps allowed. No belt-driven fuel pumps allowed.

E. Carburetor must be mounted with float bowl forward. Carburetor must have stock

4412 bodied carburetor only. No adjustable air bleeds. No aftermarket or billet metering

block allowed. No piston type fuel pumps allowed. Must be stock diaphragm type.