Please help me diagnose this 273

SeattleQQ1Fish said

The needle was bouncing around during the vacuum test. Not severely, but it wasn’t perfectly steady. I’m not sure what power valve is in the carb, it’s whatever Holley put in it new from the factory. The way I checked for a leak was to spray carb cleaner all around the intake and base of the carb looking for a change in rpm.

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I would always refrain from using carb cleaner or any flammable liquid. I have seen many lose their cars doing this. A bad spark pug wire , Or spark from anywhere will ignite The liquid. Use a small hand held propane torch with a hose on the end to reach all areas. If a spark ignites it you can pull it away . A gas is way better than liquid. Its not soaking the motor that once ignited on an oily motor or wire is not always easy yo put out.

A friend of mine lost his truck years ago. And he was burned pretty bad trying to put it out. with a old used shop rag that just made it worse. Just advise you may want to use. If you feel you are to experienced at doing this. Go for it but you have been warned. Seen liquid spray ignite many motors.

Check how fast a fire can spread with starting fluid and how long it burns . Just think if this was under the hood of a car with oil soak wires or rubber parts.