[My442]

I chased this on a 455 car, and found that the mechanical advance springs were weak, and they allowed too much advance.

Also, it takes an aftermarket aluminum radiator to bring down the running temps to the 185-190 range.

I have never had a factory radiator do that, even recored.

[T A 70]

Originally Posted by My442

Also, it takes an aftermarket aluminum radiator to bring down the running temps to the 185-190 range.
I have never had a factory radiator do that, even recored.

Totally agree...money well spent..

[Old Goat 67]

Originally Posted by T A 70

Totally agree...money well spent..

Have to respectfully Totally disagree. Not needed in Louisiana heat!

[T A 70]

Originally Posted by Old Goat 67

Have to respectfully Totally disagree. Not needed in Louisiana heat!

What's different about Louisiana?

[GT182]

It's funny that back in the days these cars were new and the used ones a few years old, there was no overheating issues and no one used aluminum radiators.... unless I suppose they were drag racing. Even the guys I knew that ran pontiac engines on the dirt tracks didn't have many problems. Problems they usually had were punctures.

The 3 Pontiacs I had back in the 70s.... 66 GTO, 63 GP, and 66 Tempest Custom.... with their original radiators never overheated, even on the hottest days of summer. Not even my buddy's 421 62 GP with the cars original radiator. The owner of the local radiator shop here says it's only because of the larger tubes that an aluminum radiator cools as good as or cooler. Other than that they're no better than copper and brass, and mostly not as good. And he should know.

[T A 70]

Originally Posted by GT182

It's funny that back in the days these cars were new and the used ones a few years old, there was no overheating issues and no one used aluminum radiators.... unless I suppose they were drag racing. Even the guys I knew that ran pontiac engines on the dirt tracks didn't have many problems. Problems they usually had were punctures.

The 3 Pontiacs I had back in the 70s.... 66 GTO, 63 GP, and 66 Tempest Custom.... with their original radiators never overheated, even on the hottest days of summer. Not even my buddy's 421 62 GP with the cars original radiator. The owner of the local radiator shop here says it's only because of the larger tubes that an aluminum radiator cools as good as or cooler. Other than that they're no better than copper and brass, and mostly not as good. And he should know.

Well, you have to account for leaded gas and higher octane fuels in "those days"...both kept engines running cooler...an aluminum rad (Rodney Red) dropped my temps 30 degrees in my '70 Trans Am with the unleaded/low octane gas we have now...