Quote:
Originally Posted by DGthe3
Nearly all the variants in the High-feature V6 family (3.0L and 3.6L) are between 80 and 90 hp/L, and there are a few in the Ecotec 4 cylinder family are up in that range as well. I don't know the sales numbers for each engine, but I don't think its unreasonable to assume that at least 1 in 5 GM vehicles, worldwide, has one of those engines.
As far as I know, all these engines are DOHC, and any that aren't would be SOHC not push rod. But the placement & number of cams (to my knowledge) doesn't impact engine longevity
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I'm not saying an overhead cam engine is more reliable or longer living than a cam in block engine, just that they put out more horsepower per liter than a cam in block engine.