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DeuceCoupe · 09-26-2021, 01:06 PM

Yes for 1971 I/SA=11.00 lb/hp.

I found:
1971 GTO convert, 3717/335=11.10 455/355HO
1971 Lemans 2dr HT, 3575/325=11.00 455/325 auto-only 067 cam

The 455HO was more underrated & lots of people ran it so that might make sense. IF it's the right year.

I can tell from other cars that NHRA had left the 455/335HO at its 335 rating. I dont know about the 455/325 combo, havent found any other cars running that engine. Unless I know something was factored I ASSUME it was not, back then.

Note that Fields D/S=8.50 Firebird had to be factored to at least 375hp (or even 380hp like the RA4) to fit class. So the RA2 did get factored, even up from its GTO rating of 366hp, no surprise there.

Petersen has a file on 71 Indy so there might be a picture.
I missed this thread so didnt know the car numbers until now.

Also confirms Schellenberger made SS/E in a 71 Mustang 429SCJ, WAY over-factored at 430hp, down from the 490hp the 429SCJ was factored at in SUPER-stock in 1970.

I still wonder if NHRA was hating on the 429SCJ so factored it higher after FoMoCo sandbagged so much on the 428CJ at "335hp" LOL.

09-26-2021, 01:06 PM	#7
DeuceCoupe Member Join Date: Feb 2016 Posts: 267 Likes: 96 Liked 45 Times in 41 Posts	Re: 1971 US Nationals class winners. Yes for 1971 I/SA=11.00 lb/hp. I found: 1971 GTO convert, 3717/335=11.10 455/355HO 1971 Lemans 2dr HT, 3575/325=11.00 455/325 auto-only 067 cam The 455HO was more underrated & lots of people ran it so that might make sense. IF it's the right year. I can tell from other cars that NHRA had left the 455/335HO at its 335 rating. I dont know about the 455/325 combo, havent found any other cars running that engine. Unless I know something was factored I ASSUME it was not, back then. Note that Fields D/S=8.50 Firebird had to be factored to at least 375hp (or even 380hp like the RA4) to fit class. So the RA2 did get factored, even up from its GTO rating of 366hp, no surprise there. Petersen has a file on 71 Indy so there might be a picture. I missed this thread so didnt know the car numbers until now. Also confirms Schellenberger made SS/E in a 71 Mustang 429SCJ, WAY over-factored at 430hp, down from the 490hp the 429SCJ was factored at in SUPER-stock in 1970. I still wonder if NHRA was hating on the 429SCJ so factored it higher after FoMoCo sandbagged so much on the 428CJ at "335hp" LOL. Last edited by DeuceCoupe; 09-26-2021 at 01:10 PM.