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engineguy · 01-25-2019, 09:08 PM

But, before the advent of the .90 classes (early, mid 70's) there was a "formula" Hot Rod Class. Cars were divided into "Formula" based upon Transmission (stick or automatic) and number of carburetors (single or multiple carburetors) then further divided by weight divided by cubic inches. For example Formula 2, D/Hot Rod, etc.

01-25-2019, 09:08 PM	#12
engineguy Junior Member Join Date: Jan 2003 Location: Gold Canyon, AZ Posts: 12 Likes: 0 Liked 1 Time in 1 Post	Re: IHRA Super Stock Modified But, before the advent of the .90 classes (early, mid 70's) there was a "formula" Hot Rod Class. Cars were divided into "Formula" based upon Transmission (stick or automatic) and number of carburetors (single or multiple carburetors) then further divided by weight divided by cubic inches. For example Formula 2, D/Hot Rod, etc.