Possible causes for GTOs overheating - Page 12 - Pontiac GTO Forum
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post #111 of 116 (permalink) Old 10-13-2014, 08:34 PM
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Guys, putting a TH350 in my 66 Lemans, need to rout. The new coolant lines, does anyone recall if original trans coolant lines go above or below the sway bar? It looks awful close either way, want to get it right and not bend the new lines. Ripped off the old ones, buts. I can't recall above or below.....it always happens!
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post #112 of 116 (permalink) Old 11-02-2015, 10:14 PM
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Great read. I have this same issue with my 1966 Tempest with the stock rad and 326 engine. Replaced upper rad hose, t-stat, and rad cap. So far so good. Car hasn't spit coolant since I did this. However, I did buy a new water pump, shroud, and clutch fan, for install this winter.

I read earlier that one of the posters said to make sure that the lower rad hose has a spring in it. I checked and the current one does, but the new one I bought does not. What is this springs purpose and can I just take the old one out and put it in the new one? Thanks for any help.
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post #113 of 116 (permalink) Old 11-03-2015, 07:23 PM
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It keeps the hose from collapsing. If it is not rusted bad, you probably can reuse it.
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post #114 of 116 (permalink) Old 11-05-2015, 07:32 PM
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Much thanks!
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post #115 of 116 (permalink) Old 02-14-2016, 10:31 AM
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Great information, have a 68 that will benefit from this. thanks again
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post #116 of 116 (permalink) Old 05-15-2019, 11:03 AM
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Another thing I have found to be miss-understood is vacuum advance. Additional advance coming from the vacuum advance at idle helps keep your car cool and provides better throttle response.

If someone along the line has removed it put it back

Also if you have replaced your carb with a holley or other aftermarket carb and the vacuum advance is hooked to the ported vacuum ( as it actually states in some of the installation manuals) change it to a manifold vacuum port. Ported vacuum is an emission control. It removes vacuum advance at idle to raise operating temp and burn the gases more completely.

You want this advance from a performance perspective and to keep your old beast cool
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO Complete Engine Compartment Discussion

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