2019 WISSOTA Pure Stock Phase In Rule Adjustments

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Posted April 2, 2019

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Chateau Speedway is going to follow WISSOTA sanction rules for Pure Stock and Hornet classes with the exception of the following…during a phase in period/

Pure stock

* 3:56 max gear ratio 305 motor unlimited gear ratio

*No tranny protest

*Don’t need to have sway bars

*Our engine rule will be as follows…

No intermarriage of engines allowed (GM for GM and Ford for Ford, etc., only).  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 crankshaft. 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 ¾ inch thick. 305, 350 and large journal 327 minimum size is 6 ¾  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 engine will be permitted a maximum displacement of 367 C.I.D. Engine compressions limit 9.5to1. D. Distributors. Stock O.E.M. distributors only. Billet distributors allowed. No multiple spark boxes. Modules must be stock appearing. 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.  E. Stock cast iron two or four barrel 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, 370, 10239906, 14011083, 14096217, 10125320, 10208890, and 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 ¼ -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. Guide plate’s 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. No bee hive-conical type valve springs allowed  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. 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. Maximum valve lift is .465 inch. Valve lift will be checked on the push rod side, multiplied by 1.5. (stock rocker ratio allowed) Stock push rod lengths mandatory for engine.   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 only. No center-dump manifolds or LT1 manifolds allowed on Chevrolet. No manifold with a cold inside diameter of 2.25 inches allowed. Casting numbers also not allowed are 10168496, 10168494, 10168495, 10108700, 10168544 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. Maximum 2.5 inch O.D. exhaust pipes allowed. I. One (1) radiator only: Must be in stock location. Aluminum radiator allowed. Radiator core support may be removed.  J. No crank trigger ignitions allowed. K. No vacuum pump/air pump allowed. L. 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.  M. All engines are allowed to run a valve train oil deflector. N.  No Coating, painting or any other work to inside of intake manifolds, heads and block lifter galley allowed. O. Lifters must collapse a minimum of 100 thousands and be made of magnetic material. P. No external oil pumps of any kind allowed. Q. Starter must be in stock location. R. Main cap girdle not allowed. Crank scraper not allowed. 


*ENGINE  variable cam timing motors permitted,  No turbo’s allowed.

*WEIGHT RULES:  Dual overhead cams must weigh 2200 pounds. Single overhead cams and non-overhead cams must weigh 2100. 3. Officials may modified weight rules 

*Aftermarket rims permitted