ducenqtr69 Posted June 3, 2002 Share Posted June 3, 2002 Has Any One looked at the Heatriser or Collapsed Muff or Pluged Exh Pipes , This will Cause same problems,??/ rapid over heat or timing to far advanced ??? Always Something else??? than The obvious Link to comment Share on other sites More sharing options...
BUICK RACER Posted June 3, 2002 Share Posted June 3, 2002 JT, when do they overheat, driving or after the shut down? Chris and I had both '73s that would overheat after we shut them off, and the heads were cracked! Tough to find without magnaflux, etc. Seems like it was a '73 problem more than any other year, so see what year blocks they are using. RV Link to comment Share on other sites More sharing options...
The Old Guy Posted June 3, 2002 Share Posted June 3, 2002 Both cars have good dual exhaust systems ,but It could be the heads. I suggested that they pull them and have them magnifluxed. <BR> Thanx Link to comment Share on other sites More sharing options...
The Old Guy Posted June 3, 2002 Share Posted June 3, 2002 I have two buddies that are having a problem with 455s running hot. One is in a 50 Merc lead sled,and I suspect he is not moving enough air ,as the engine compartment is FULL. The other one is the real problem. He has changed radiators ,water pump and thermostat and it still get to 230 in five minutes of driving. Can it be a cracked head ? He even pulled the heads to see if the gaskets were good (they were)Ican't believe the block is plugged ,and I do not know what to tell him.<BR> HELP<p>[ 06-02-2002: Message edited by: The Old Guy ] Link to comment Share on other sites More sharing options...
Steve B Posted June 3, 2002 Share Posted June 3, 2002 Bubbles in the antifreeze overflow when it is running? Link to comment Share on other sites More sharing options...
Guest Posted June 4, 2002 Share Posted June 4, 2002 Hmmmmm...are these engines running with or without a shroud ...i know i ran without one for a short time...didnt take me long to get a shroud....mark Link to comment Share on other sites More sharing options...
The Old Guy Posted June 5, 2002 Share Posted June 5, 2002 The 455 with the problem has an aluminum rad by Howe racing (the same one I have in my street rod which runs cool as a cucumber)He is also running a BIG electric fan ,and it still heats up. I just talked to him this evening ,and he pulled the heads and had them magnifluxed ,and they are good. The only thing left that I can think of ,is a block full of debris. Link to comment Share on other sites More sharing options...
Guest Posted June 5, 2002 Share Posted June 5, 2002 As the prior post states - what about air bubbles??? On my 60 Invicta something is wrong - the hoses get rock hard after 5 minutes and I'm getting the air bubbles - almost like somebody put Tide in the antifreeze. Also - I'm getting white smoke for a couple of minutes after start-up even though the temp is relatively warm. I am thinking head gasket. Link to comment Share on other sites More sharing options...
Guest Posted June 6, 2002 Share Posted June 6, 2002 I would have to agree with ya old guy...cooling passages could be restricted...i assume your friend can take his thermostat out (if he hasnt already) and will still heat up?....only other thing i can think of is to lower the boiling point with a lower pressure radiator cap...Mark Link to comment Share on other sites More sharing options...
Guest Randy Berger Posted June 6, 2002 Share Posted June 6, 2002 You must have either a thermostat or a restrictor plate - if neither, the water moves through too fast to pick up heat.<BR>Double-checking the timing and the cam timing couldn't hurt either. <BR>Be sure and come back and let us know the resolution when you find it. Link to comment Share on other sites More sharing options...
Guest Posted June 9, 2002 Share Posted June 9, 2002 You could take the radiator cap off, start it up and stick a thermometer in the radiator. See if the radiator water gets as hot as the gauge hooked to the engine. That could tell you if you have a water flow problem. Link to comment Share on other sites More sharing options...
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