[69SSZL1]

I have been driving my ZL-1 Camaro for over 6 years and have discovered alot about these motors. They like lots of timing advance, they don't like exhaust pipes. Remember that your T.I. ignition retards timing 1 degree for every 1000 rpms. Set your gap at .035" for a stable idle. Add an adjustable vacuum advance pod to the distributor connected to full-time vacuum. Set initial timing to 12* -14*, my vacuum pod adds 11* at idle, total timing is 42* @3000rpm. You probably will need to add a mechanical advance limiter to the distributor to achieve this. The stock exhaust system will dog this motor, and dilute the chambers so much as to lose 100hp or more. Carb: make sure your power valves are rated below your engine vacuum, they can cause eratic idle as well when they fluctuate, Holley power valve blow-out protection is required due to the cam spitting back when cold. I could go on and on, but this is the greatest motor every built by Chevrolet. It works great on the street, but is a race motor that has unbelievable power!