I've been having some overheating problems as of late with my Buick. The problem? It's getting too hot! I just replaced the water pump, put in a new 180 thermostat, flushed out the old coolant, etc. I've pretty much gone through the whole system, and it's a lot better now than it was. In traffic, it used to get hot REALLY fast, but the water pump and thermostat seem to help. The problem now, is after getting the car all warmed up and driving for an hour or so, I'll shut it off, and come back and start it up, and since it's been sitting, the temp will be at like 200, and it doesn't want to run. It will start, but then start to die unless I gas it a lot. Anyone out there know what it might be? Fuel getting too hot? I can't seem to figure this one out. I should probably also mention the motor is a 307 Chevy SBC with an Edelbrock 4 bbl carb and manifold, stock fan, no fan shroud, stock radiator, running 8 degrees advance, stock distributor w/ petronix.
Doesnt sound like you have an overheat problem. Engines warm up after setting idle. 200 is not hot. the starting issue sounds like you may be too far advanced in your timing. Check your timing and retard it a tad. I had a problem similar to this after running a 350. Thinking it was just a starter heat sink issue and never really retarded the timing till years after. Finding that was the issue all along.
Gas is boiling in your carburetor. Next time it happens try cooling the float chamber area of your carb and see if it doesn't help. Have you changed anything under the hood? Added anything lately that might cut down on air flow?
Haven't added anything lately that would cut down air flow...haha except for that cheap air cleaner. Maybe I'll put the other one back on. The problem isn't really a starting issue, but more of a "one i get it started after it's been warmed up" issue. I was thinking it could be fuel is getting too hot. Would a carb spacer help? I used to have one on there, and it didn't seem to have this problem when it was on...but it's been a while since I took it off so I could be wrong. I'll try retarding the timing a bit too...any other suggestions?
If timing doesn't do it, try the spacer. It doesn't take much separation to cool it enough so the gas doesn't boil.