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tubman · 09-25-2020, 12:47 PM

I had the 327 in my Corvette rebuilt a while ago. When I got it running, it ran well, but would not idle for any period of time at all before it started to boil. I tried everything; changed the radiator cap, flushed the system, and a bunch of other things. I was just getting ready to pull it, when all of a sudden it settled down. Like the previous poster, I believe that it was built too "tight", and after it finally got broken in, it was (and still is) fine.

I'm not saying that this is your problem (flatheads have more cooling foibles than SBC's), but this is what I experienced.

09-25-2020, 12:47 PM	#7
tubman Senior Member Join Date: Dec 2013 Location: Minnesota, Florida Keys Posts: 10,299	Re: New Rebuild Overheating I had the 327 in my Corvette rebuilt a while ago. When I got it running, it ran well, but would not idle for any period of time at all before it started to boil. I tried everything; changed the radiator cap, flushed the system, and a bunch of other things. I was just getting ready to pull it, when all of a sudden it settled down. Like the previous poster, I believe that it was built too "tight", and after it finally got broken in, it was (and still is) fine. I'm not saying that this is your problem (flatheads have more cooling foibles than SBC's), but this is what I experienced.