CorvetteForum - Chevrolet Corvette Forum Discussion - base timing on a 1978 mild modified L-82

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base timing on a 1978 mild modified L-82

I just rebuilt the L-82 in my 78 and I am trying to tune the engine now I have added some aftermarket parts such as a 600cfm edelbrock carb, an air gap performer intake, MSD ignition system, and hooker headers with true dual exhaust. Now I am looking to set timing right. It is at 26 degrees BTC base, I’m not sure what total is with mechanical or vacuum. But I was wondering if someone could point me in the right direction. I had it down at 20 degrees BTC but it ran horrible. So I guessing I’m close but I really am not sure so any help I can get would be great.

Re: base timing on a 1978 mild modified L-82 (1978Anniv)

You should be 8-12° advanced for idle with a stock to mild cam. Check your dist weights to make sure they are freely moving and disconnect the vac advance. Then set total advance to 36° at 3000 RPM without vacuum.

Re: base timing on a 1978 mild modified L-82 (1978Anniv)

Get a copy of Lars Timing Paper at http://www.corvettefaq.com It will answer all the questions you ever needed to know about timing! :yesnod: