Why can't LT1's use the crank gear to advance or retard a cam?

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07-07-2006, 09:31 PM

matt94z

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Why can't LT1's use the crank gear to advance or retard a cam?

Like the title cays. How does it throw opti timing off? Any info apreciated. I did buy off set cam bushings just in case, but I want all the info I can get.

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07-07-2006, 09:48 PM

GIZMO

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Because, with an opti-spark, if you move the cam you move the ignition timing. If you have DFI or a crank trigger you can make up for it.

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07-08-2006, 12:45 AM

DeltaT

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Why would you want to move the cam? +4 or -4 degrees is a VERY subtle difference, and not really worth the hassle. If you're a racer I can see doing it to tune to the track conditions, but with the LT1/4 it's too much of a hassle to make it worth it.

Jim