more:
clogged or restricted exhaust/
wrong cylinder head gasket? or installed incorrectly
centrifugal advance fails due to sticking weights
slipping belt
leaking water pump seal(allows air in)
build-up of scale in block
idle speed too low
antifreeze concentration over specification
You are producing more heat than the system was designed to handle?
not enough coolant in system
casting flash blocking cooling passages
oil or grease in the coolant will affect heat transfer
alcohol based antifreeze in mild weather
From Motor trouble shooting guide:
Six basic causes for overheating water cooled engine:
1. water not cooling engine
2. Air not cooling water
3. Pre-ignition
4. Pinging
5. excessive friction in engine or powertrain
6. excessive backpressure in exhaust system
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1967 Firebird 400 conv T400 3.08, 1989 Formula 350 700r4 3.27
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