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Tom P · 01-29-2020, 03:45 PM

I am curious why it's always been worded as "must hold volume" and no mention of maximum.

"Cylinder head must be able to hold combustion chamber, intake and exhaust runner volumes per NHRA Specifications"

The way I interpret that is a five gallon bucket will hold a gallon but a one gallon bucket won't hold five. So ports can be larger than their spec but not smaller.
Obviously they want the combustion chamber to hold all of the 72cc or whatever spec is but they want that 205cc port to hold NO MORE THAN 205cc.

Why wouldn't they just say that?

A lot of the rulebook seems to have been written in 1952 and they added extra words instead of rewriting the whole thing. The previously mentioned pinned studs for example.

01-29-2020, 03:45 PM	#143
Tom P Senior Member Join Date: Mar 2002 Posts: 707 Likes: 30 Liked 239 Times in 94 Posts	Re: NHRA 2020 Rule Amendment SS Intakes??? I am curious why it's always been worded as "must hold volume" and no mention of maximum. "Cylinder head must be able to hold combustion chamber, intake and exhaust runner volumes per NHRA Specifications" The way I interpret that is a five gallon bucket will hold a gallon but a one gallon bucket won't hold five. So ports can be larger than their spec but not smaller. Obviously they want the combustion chamber to hold all of the 72cc or whatever spec is but they want that 205cc port to hold NO MORE THAN 205cc. Why wouldn't they just say that? A lot of the rulebook seems to have been written in 1952 and they added extra words instead of rewriting the whole thing. The previously mentioned pinned studs for example.