10 degrees overlap for Ls3 DD
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With a good tune, you shouldn't have any. There's plenty of big cammed ls3's on the street with more overlap and no issues. Granted I only have 7 degrees of overlap but I have mine idling 750 and no surging or bucking issues on a stock stall. Just took me quite a few hrs. on getting the drivability down pat but Im pretty new to tuning/hp tuners. A good tuner should have it purring like a kitten.
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Tuning is key. But it can be tuned with that much overlap to reduce or eliminate any surging or bucking. You need someone that is willing to tune the driveability not just a WOT tune.
Lonnie
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