Ram Air IV versus 455 HO

[supergonzo]

However the 73 455 SD was the best of all of these. Even though rated at 310(290) net HP.

The 73 455 Sd intake was cast iron, by emission necessity. So it was fair in performance.
The 73 455SD heads out flow any other Pontiac heads made, other than RAV Tunnel ports. I have 2 sets of these and one going on a 73'T/A I'm building. At the time were said to out flow even HEMI heads! Although this is not true. What is true is that the heads were meticuously cast. Meaning most factory heads (any brand)have large casting differences among them, even within years. Depending upon the casting machine you could get a good LS6 head or a fair LS6 head. One that is clean and one that has casting imperfections in the passages, or even half closed passages alltogether. This is true of all brands.

The 73 455SD heads were all made very well. I have never seen a crappy one. They used slightly bigger Ram Air type exhaust manifolds than even the RAIV /455HO's.
As mike said: Today a 455SD with the original planned RAIV cam in it, and uncorked exhaust, 10 to 1 compression.. is a bad ass. One that is capable of staying with anything ever built in the muscle car era. Even in 1973 HotRod magazine tested one with 3.42 gears at [email protected] you read the article they mentioned that they had the air conditioning on while track testing it!! Other tests by other mamagzines were similar.

As a side bonus if you have ever driven a 70-74 Trans AM, they make any 60's muscle car feel like you are driving a school bus. They handle virtually like today's cars.