youngmonte71 Posted January 31, 2011 Share Posted January 31, 2011 im looking to buy a 454 its a Mark IV 90-91 4 bolt main. but on the back of the block it says Hi Perf. what makes that different then a normal 454? Quote Link to comment Share on other sites More sharing options...
Mike 57 Posted January 31, 2011 Share Posted January 31, 2011 Nothing, 4 bolt, 2 bolt they all say HI Perf and pass I have seen some blocks missing the P in pass I can't say for sure, I would have to dig one out but I think the tall deck truck blocks say truck Quote Link to comment Share on other sites More sharing options...
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