Wood, i am running a 455 with a comp xe274 and about 8.5 compression and i only see about 135-140 on the compression, and i have done leak down tests and such, i think the xe cams bleed off cyl pressure that is why they work well in low compression engines. You need ot do a leak down test to check things out. I installed my cam straight up but did not degree it to check it.
Mike
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