LS3 casting GM corePAC 1219 (.660 duel valve spring option available)GM Valves re-manufactured ..
Motorsports Customer Supplied CNC ported heads Get
your heads CNC portedCNC PO..
Introducing the NEW Thompson Motorsports and Frankenstein Engine Dynamics Cylinder HeadsThese LS3 he..
PLEASE NOTE THIS PRODUCT IS ON BACK ORDERUNTIL Mid-June 2020Introducing the NEW Thompson Motorsport..
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