Regarding the 455HO of the 1971-72 era, does anyone know the history of these engines? There was a 1970 455HO but it was a different animal than the 1971-72 models. Was the 1971-72 455HO something that was really thought out or was it a piece mill for those two model years due to dropping compression ratio drops [and GM lifting the ban on putting those engines in intermediate size cars] because I’ve read the SD455 was in development during that time frame.
WRT to Pontiac not developing the 455 [SD or HO] has always been a question to me but they did have other projects going at the time; a RA-V, RA-VI and RA-VII and I believe I read once Pontiac was working with Chrysler to come up with a engine very similar to the HEMI.
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