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JIM MARSHALL · 01-11-2023, 06:04 PM

I don’t know what 455 you guys are referring to but a quick look at the guide shows the last time one had an increase or decrease was 2008.
That being said the late George Thompson raced a 1972 Olds 442 in G/SA with a 455 and could easily go a second under if he wanted to. I don’t have the answer but I do know I run the combo that has the greatest chance for success.

01-11-2023, 06:04 PM	#2
JIM MARSHALL Member Join Date: Mar 2002 Location: Indian Land SC Posts: 122 Likes: 251 Liked 337 Times in 46 Posts	Re: LS1 Horsepower Factors I don’t know what 455 you guys are referring to but a quick look at the guide shows the last time one had an increase or decrease was 2008. That being said the late George Thompson raced a 1972 Olds 442 in G/SA with a 455 and could easily go a second under if he wanted to. I don’t have the answer but I do know I run the combo that has the greatest chance for success. __________________ Jim Marshall 1967 STK