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That's something that will have to wait. I know the cam was degreed and found to be correct when the engine builder assembled the motor, the opti is a vented that I personally installed and know is on correctly, and the motor doesn't act like the timing is off (I've worked on LT1's where the...

Otto, It's a 93, running a 95+ Vented opti, using a Brian Macy (Fast Track Performance) piggyback harness. No timing to match up at the balancer. No timing marks on balancer. It's ONLY a low RPM light load backfire. Anything else I give it it's fine, be it at idle or being more...

This isn't on a turbo buick, but on a single turbo 93 LT1 car, opti and all. I was recommended to ask here from LS1Tech because of the amount of knowledge and number of XFI familiar people here. I must say that after browsing I'm quite impressed. Anyway, I've got a fresh motor (383 stroker)...