Chevelle Tech - View Single Post - LS6 crate 454 piston help
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post #11 of (permalink) Old Nov 19th, 02, 2:22 AM
Join Date: Jul 2002
Posts: 392
HI Volney
In 1990 I bought a new XXA LS6 crate engine part #366250 It came with the closed chamber pistons & open chamber heads witch gives you 10.23to1 compression. The original 1970 motors had closed chamber pistons and closed chamber heads & 11to1 compression.I ran it on Sunoco 94 octane for many years 40,000 miles and didn't think there was any problems (motor ran fine and no ignition ping) until I had the motor rebuilt this past summer. The engine builder said I had damaged the piston skirts due to detonation??? I replaced the pistons and dropped it down to 9to1 to avoid any further problems with detonation. Dave
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