Firebird 67-68

[Jeff Lee]

Originally Posted by Adam Strang

The HO and Ram Air 1 motors had D port heads and the Ram Air II motor had round port heads with the standard size intake port in `68.In` 69 the Ram Air IV motor was introduced with round port exhaust like the Ram Air II but with a taller intake port had the same cam as the Ram Air II but had 1.65 rockers.The 400 HO was called a Ram Air III in `69 and `70. So,no the Ram Air IV and HO motors do not have virtually the same specs.

I agree on the round / D port, etc., but I think the confusion on names is Pontiac never really had a Ram Air II. They had the 1968 400 4bbl with D ports and no numerical designation which was followed by a Ram Air with round ports which technically was never marketed as a Ram Air II. Correct? Followed by the Ram Air III of 1969/1970/1971 with D ports and the RAIV with round ports of 1969/1970. I'm no Pontiac expert so let me know if I'm wrong.

I wonder why NHRA has the 1969 Firebird RAIV and RAIII rated the same 356 HP with all the better parts on the RAIV? Seems like the RAIV would be the best of these two.
1968 shows in NHRA as having the Firebird with a 400 that's OEM / NHRA rated at 330 / 325 - 335 / 327 - 335 / 340 RA & 340 / 335 RA. That would take a lot more investigating.
Since I'm not building a FB, good luck Janne!