Did a recent tune-up. All plugs looked good except the back one on the passenger side. It was caked with black gunk on the end and a little bit of brown on the tip. It doesn't smoke. I'm not sure how long the plugs were in there. In the short time I've had the new plug in, I've been keeping an eye on it, and it seems like it's starting to do the same thing. Would putting in a hotter plug (has Autolite 46s) help? If so is an Autolite 45 hotter or what is a hotter plug? Or maybe install a non-fouler on the plug? Or anything else to get by temporarily?
I plan to do a compression test too. What should the compression be for a stock 76 302? What's the best way to do the test? Is there anything else I should do to pinpoint the problem before I tear the engine down?
I plan to do a compression test too. What should the compression be for a stock 76 302? What's the best way to do the test? Is there anything else I should do to pinpoint the problem before I tear the engine down?