ZZZBrahmaBull Posted June 13, 2012 Report Share Posted June 13, 2012 Bryon at JR Motorsports needs to know at Shady Oaks if I can run any cast iron head including aftermarket heads as long as they are 72cc or do they require the GM on them?To be able to run in the street stock class. Thanks. Link to comment Share on other sites More sharing options...
Racer '77 Posted June 13, 2012 Report Share Posted June 13, 2012 From Shady Oaks website: Rule 2.4.1 Any cast iron head 72cc minimum, max.2.02 intake / 1.60 exhaust valve. (No Vortec) heads Link to comment Share on other sites More sharing options...
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