Thread: 70 chevy with 350 engine trouble

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If you have a points distrbutor & points gone bad, replace it.
Verify correct gap in points. I dont recall what is should be.
Rotor, cap, points may come as a package. Its been 20 years since Ive messed with thst set up.
Check spark by grounding a sparkplug against the engine block with the plug wire in the distributor. Have someone try to start the motor as you watch the spark nump from the plug to the block. It should be a brilliant blue. Yellow is a weak spark.

As an aside, if you're changing points, consider eliminating them with a Pertronix I kit. Easy to do, improves spark and never needs any adjustment. Cost like 28 bucks.