Help with pushrod length!!
#1
Staging Lane
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Join Date: Nov 2003
Location: Bedford, TX
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Help with pushrod length!!
I have a set of GM performance parts ls6 heads milled .050, cometic .041 head gaskets and TSP 231/237 cam, what length pushrods do I need, and what will my compression be?
#7
TECH Senior Member
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Yeah, you need to know the base circle difference. Theres a .020 discrpency between factory (7.380) and aftermarket (7.400) pushrods. And your gasket brings you .011 closer as well, so if you had a .050 difference in base circle radius youd still be .031" deeper than stock preload. Most manufacturers suggest that you have less preload than stock. Id probably go with 7.350 pushrods and run .019" under stock preload. Or youll do fine with 7.375 pushrods and running .006 over stock preload. That being said, my setup is .011 over stock preload and it runs well. No problems with lifter pumpup.