getting ls6 heads put on the ls1???
What tranny? What gears? Have supporting power mods?
I must agree.
At least get a spring kit.
What I would do is save yourself the 900-1000 dollars on the LS6 heads your buying and buy a set of heads from a sponsor.
For example TEA has a stage 1.5 head that is a 5.3 casting. It is completly ported and polished and comes setup to run damn near any cam you would want. Titanium retainers, Gold sprinds, better valves etc.
Those are 1550 plus a camshaft.
You would get much more power out of these heads then stock LS6 heads.
Look around. TEA, Patroit, and quite a few other companies have very good priced heads.
I think this combination should be good for 60-70rwhp over a bolt on ls1.
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