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Myron Piatek · 10-26-2010, 04:57 PM

Do I understand correctly that now "any" valve spring is permitted, including dual springs "provided no modification to head is performed."? But that removing the "step" on Mopar heads would be considered a "modification"?

IHRA usually follows NHRA.

10-26-2010, 04:57 PM	#7
Myron Piatek VIP Member Join Date: Nov 2001 Location: Florida Posts: 1,542 Likes: 34 Liked 138 Times in 51 Posts	Re: 2011 Stock/Super Stock Rule Changes Do I understand correctly that now "any" valve spring is permitted, including dual springs "provided no modification to head is performed."? But that removing the "step" on Mopar heads would be considered a "modification"? IHRA usually follows NHRA.