Did you use a two part flush?
That type is the best, but you should by pass the heater core for the flush.
Is there a fan clutch and does it keep the fan engaged at engine idle speed when the motor is up to temp,
Does one of the exh manifolds still have its heat riser flap and if so is it jammed closed?
Is the exh system bent up and restricted?
If the vacuum advance is not working that can contribute to low speed hot running.
You might just right off the bat pull the water pump to make sure the two seal incerts are there in the divider plate and are in good shape and also to check the water pump impeller to divider plate clearance.
Also just to look at if the pump has the preferred good cast iron impeller or if it’s crappy type that looks like an Alternator fan .
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
Last edited by steve25; 08-28-2025 at 06:25 PM.
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