I liked what Katech has to offer for the LS7, plenty of R & D verifing their cam and valve spring combinations as well as diagnose valve train issues using a spintron. So I pulled the heads and sent them to Katech for their "LS7 fix" including porting, bronze valve guides, Ti/Mo intake valves and new LS7 exhaust valves, and PSI springs set for their Torquer cam among other items
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