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is there any difference in deck height from ls1 to ls6 heads? i want to put LS6 heads on my LS1, am i going to need anything different, shorter pushrods?
Yep, just new head gaskets, head bolts, etc.
Everything else switched right over.
Honestly I would look into a set of ported LS6 heads.
You can pick up a set with 918 springs for like 1000 bucks.