lm7 3.5 valve springs in a 5.7 vortec?
July 9th, 2018, 5:32 PM
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lm7 3.5 valve springs in a 5.7 vortec?
hello i was wondering if anyone has some info on swaping lm7 5.3 behive springs into 5.7 vortec heads this is for a marine application so dont need crazy lift just want to upgrade to behive springs and could get a little bit more lift without machining i know the ls6 springs are a commen swap but i have a set of 3.5 springs laying around from a previous build ..would this be any sort of upgrade i know the lm7 are roller lifters so need more spring rate and the 5.7 is hydro tappit i just cant find any factory spring specs for them to compare i would be thankfull for any info
