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GMC V6 and V12 Engines Engine repair and rebuilding |
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#11
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Re: Thermostat housing / water outlet
Quote:
Thanks. |
#12
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Re: Thermostat housing / water outlet
According to Rock Auto it fit:
PONTIAC ACADIAN 1968-1971 PONTIAC BONNEVILLE 1959-1970 PONTIAC CATALINA 1959-1970 PONTIAC FIREBIRD 1967-1969 PONTIAC GRAND PRIX 1962-1970 PONTIAC GTO 1964-1970 PONTIAC LEMANS 1966-1970 PONTIAC TEMPEST 1961-1970 PONTIAC VENTURA 1960-1961 With a 389 cid or the 400 cid engine. I don't know if it will fit the GMC V6. |
#13
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Re: Thermostat housing / water outlet
It all depends on which water crossover you have. The later Pontiac thermostat housing with the wider bolt spacing fits my '67 351.
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#14
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Re: Thermostat housing / water outlet
Thanks! My cross over has the housing sitting on top at this point if vertical I will try to Mach up a hose. I just need the 3” in center bolt holes
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#15
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Re: Thermostat housing / water outlet
Here is a shot of the cross over
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#16
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Re: Thermostat housing / water outlet
Update….. I was able to match up a housing at NPD in Ventura!
Now I found an oil leak coming from up top and running down the top of the bell housing. Smh |
#17
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Re: Thermostat housing / water outlet
Quote:
Some thoughts regarding oil leaks: 1. Rear freeze plug in the camshaft bore... Inaccessible unless you have the motor out. Had this on my old 305E. 2. Valley cover gasket. Easy to replace. |
#18
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Re: Thermostat housing / water outlet
Thanks! The investigation starts tonight!
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#19
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Re: Thermostat housing / water outlet
Prowbar,
Investigation complete! You were correct rear freeze plug @ camshaft bore. Oddly, it looks like someone replaced it. Guess i will be pulling the motor sooner then i wanted. |
#20
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Re: Thermostat housing / water outlet
Quote:
In the last cam journal, the closest one to the freeze plug, there is a small hole drilled (about .150") longitudinally in the journal to relieve the oil that gets trapped behind the camshaft galley and freeze plug. These can also get clogged with sludge and junk. Remove the intake manifold and valley cover, then turn the engine so the drain hole is facing upwards. With a small screwdriver or drill bit, you should be able to poke it through. Having it clogged or at least, close to clogged, build up excessive pressure causing the freeze plug to leak. Hope this helps. |
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