Re: sAFE COMPRESSIONRATIO FOR 454
I ran 10:1 on a couple different 454s I had. One had 781s other had GM perf. aluminum heads. Ran both with 93, after getting timing down, they ran great. If EFI has timing control, should be fine.
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2000 GMC CCSB 454/4L80 6” lift SAS
1999 Chevy CCSB 454/NV4500 6” lift
1999 GMC Yukon 350/4L60 4" SAS
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