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12-30-2009, 05:13 PM
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Right turn Clyde
Join Date: Nov 2002
Location: Cincinnati, Ohio
Posts: 2,911
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1974 C25 octane rating
I was looking around on Jeff's site look at some vintage ads. Noticed that for 1974 the recommended octane for the 454 was 91. But the compression ratio was pretty low like 8.25:1. Looking over the ad again all the engines are recommenced for 91 octane.
So does my 454 really need 91 or is 87 okay? I just got it and put 89 in it and it seems to run okay. http://www.73-87.com/7387info/articles/74pu02.jpg
__________________
1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI |
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