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Old 06-29-2013, 08:32 AM
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ls1 vs 5.3 question

How do they compare I know the ls1 is alum block and the 5.3 is a truck motor but how do they compare in hp I'm thinking about putting in a late 70s early 80s trans am thanks

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Old 06-29-2013, 10:03 AM
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check the head flow and cam timing on both engines,if you plan to leave the engine stock.the size is slight difference but we all want as much as we can get
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Old 06-30-2013, 02:29 AM
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Thought I read the LS bottom end flex under high performance use at a certain hp level and the aftermarket cast in a fix for that.
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