Lookin for NHRA Stock Class ET/MPH from 1970-71

[DeuceCoupe]

Originally Posted by Dwight Southerland

For your inquiry, here is what I found:


302-290 Z28 315 rating
427-425hp L72 435 rating
427-420hp L88/ZL1 480 rating
302-290hp Boss 330 rating
340-275hp MoPar 310 rating
426-425hp Street Hemi 480 rating
455-370hp Olds W30 380 rating
350-255hp 1969 Chevrolet 265 rating
400-370 1969 Pontiac RAIV 380 rating


Your '62 Pontiac 421-405hp combination was listed with and without the lightweight components, which we do not have in the current Class Guide. In 1969, C/S was an 8.50 break; in 1970, C/S was an 8.00 break. The lightweight component car would have made C/S easily @ 8.57 factor.


Odd items:
1) I cannot find a listing for the '68 Dart SS Hemi car.
2) The ZL1 '69 Corvette is in the guide
3) The LS7 '70 Corvette is in the guide

Dwight,
I am still working away, up to 1967-70 now and struggling with all those 400 Pontiacs. Wondering if you have time to look up some factors circa those years.
I'm assuming from the above that all the 400ra4, Firebird and Tempest, were factored to 380hp. I am using that 380hp also for the 1968-1/2 Ra2 cars since that "fits" the cars that ran and the engines were so similar.

It seems from 1967-70, Pontiac had a zillion 400's. The stick and auto cars had different cams but the same rated HP. The Tempest and Firebird had the same engines (well at least when they were uncorked for NHRA with open headers & throttles) but the Firebirds were all rated lower.

IN GENERAL, did NHRA up-rate all the Firebirds to their equal Tempest-engine ratings? (It seems the current guides do this but I wonder if they did that right away back in 1967-70 ?)

eg 1967:
Was the "325hp" Firebird RA1 up-rated to the "360hp" Tempest RA1 rating? (which I assume was left as-is at 360)? Were both the stick and auto cam engines left with the same rating?

1968:
So, was the "335hp" Firebird RA1 up-rated to the "360hp" Tempest RA1 rating (which I assume was left as-is at 360)? Were both the stick and auto cam engines left with the same rating?

1968-70
Was the base "330hp" Firebird up-rated to the base "350hp" Tempest rating?

Oddly, today's NHRA rates the 1968 Firebird base "330hp" at 338hp auto, 325hp stick, even though the auto engine had the smaller "066" cam.

1969:
Was the "335hp" Firebird RA3 up-rated to the "366hp" Tempest RA3 rating?

1970:
Was the "345hp" Firebird RA3 up-rated to the "366hp" Tempest RA3 rating?

It seems like, unless the Firebirds were "uprated" to the Tempest ratings, why would anybody ever race a Tempest when the Firebirds has this built-in advantage?

Sorry to be such a bother, trying to make the history as accurate as I can as I try to "Gonkulate" all these cars.