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Karl Owens · 06-27-2014, 09:41 PM

The other rule issue which affected another SS/AM is the bore spacing rule. This rule was never in the rule book until fairly recently and it is a rule that doesn't make sense in pounds per cubic inch class. The bore spacing rule should be the same as Pro Stock at 4.900" mainly because Big Block Chevy and Mopar have 4.840" bore spacing which limits the cylinder head technology to 20 year old stuff, Big Block Ford however is 4.900" and allow that combination to use the latest Pro Stock technology.

My argument with the Edelbrock head is one it has NHRA engraved on it and is accepted as a replacement for the OE head, therefore Edelbrock head =OE head. The head is an exact copy of a well ported Ram Air IV head, no raised ports, uses the same intake, valve cover, valves, headers, rocker arms and is somewhat of a disadvantage over a Brodix Big Chief head with GM part number. I know Im talking to the wall when it comes to this and NHRA.

06-27-2014, 09:41 PM	#1
Karl Owens Junior Member Join Date: Dec 2009 Posts: 69 Likes: 0 Liked 1 Time in 1 Post	Re: IHRA SS Production?? The other rule issue which affected another SS/AM is the bore spacing rule. This rule was never in the rule book until fairly recently and it is a rule that doesn't make sense in pounds per cubic inch class. The bore spacing rule should be the same as Pro Stock at 4.900" mainly because Big Block Chevy and Mopar have 4.840" bore spacing which limits the cylinder head technology to 20 year old stuff, Big Block Ford however is 4.900" and allow that combination to use the latest Pro Stock technology. My argument with the Edelbrock head is one it has NHRA engraved on it and is accepted as a replacement for the OE head, therefore Edelbrock head =OE head. The head is an exact copy of a well ported Ram Air IV head, no raised ports, uses the same intake, valve cover, valves, headers, rocker arms and is somewhat of a disadvantage over a Brodix Big Chief head with GM part number. I know Im talking to the wall when it comes to this and NHRA.