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

[Dwight Southerland]

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? Yes.

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? Yes and yes.

1968-70
Was the base "330hp" Firebird up-rated to the base "350hp" Tempest rating? No. 1968 Firebird was left at 330. 1969 and 1970 Firebirds were 350.

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

1970:
Was the "345hp" Firebird RA3 up-rated to the "366hp" Tempest RA3 rating? 345hp Firebird and the 366hp Tempest were both at 366. The 370hp RA IV engines in 1969 and 1970 were at 380.

[DeuceCoupe]

Originally Posted by Dwight Southerland

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? Yes.

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? Yes and yes.

1968-70
Was the base "330hp" Firebird up-rated to the base "350hp" Tempest rating? No. 1968 Firebird was left at 330. 1969 and 1970 Firebirds were 350.

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

1970:
Was the "345hp" Firebird RA3 up-rated to the "366hp" Tempest RA3 rating? 345hp Firebird and the 366hp Tempest were both at 366. The 370hp RA IV engines in 1969 and 1970 were at 380.

Thanks Dwight that is a great help in lining things up. At least with Pontiac you don't have to worry so much about a Ram Air factor, its either a Ram Air car or its not.


I'm not sure how (or if) NHRA handled cold air in general back then - we covered where NHRA factored the flat-hood 428CJ at 340hp, but factored the cold-air 428CJ at 360hp.


But I cant find any other examples were NHRA factored a cold-air car different than a flat-hood or "warm-air" car, does that sound right?




Well now I am thinking about those doggone Street Hemi's again.
Were they ALL factored to 480hp or just the ones with cold air, which would be all the 69-70 Hemis, some of the 71 Hemis, and a few of the 67 Hemis, the RO23 glass hood cars?


Could the rest of the warm-air Hemis been factored at say 465hp or were they all 480hp?