I have the vaccum advanced connected to the ported vaccum source on my street avenger, per Holley's instructions. The timing is at 12 initial, and 35 total. It always ran good there, so I never messed with it. I would assume that if it were a timing or advance problem, I would have problems while driving as well as while sitting. It is wierd because I can cruise the car for any ammount of time at 70 degrees, it's when the temp starts to get around 100 outside that I run into the sitting problems.
Dennis, the core used is looks identical to the stock core when I took it in. I think that was a mistake, for the money, I should have bought an aftermarket aluminum radiator, and I may not be posting right now. As far as what type of fan, I am unsre. It is the same stock piece that came with the car. When I installed it, the fluid felt tight, so I thought it would be fine. I can spin it by hand when the car is off, does that tell you which it is. It does stop immediately when I stop spinning it, as novaderrik recommended, but it isn't THAT hard to turn by hand, nothing you would have to put any real effort into.
The shroud is bone stock, as is the fan and clutch, so the clearance should be the same as it always was. The fan is centered in the shroud, and looks like it is at the right depth compared to what I see on others cars.
SO, what could be causing this? Is it just the fact that my stock radiator may not be able to handle my beefed up motor? Could the clutch be bad and be causing these problems? It is more of a nusance(sp?) than anything. I don't usually drive the car on 100 degree days in heavy traffic, but it pisses me off that I couldn't if I wanted to. Any other help would be great.
67 Pro-touring Camaro-327, 9:1, Comp XE268 Cam, Perf. RPM Intake. 750 Holley, Sportsman II Heads, Ceramic coated headers, 700R4 trans, 17" Amer. Racing TT2's, 12" disc brakes, custom stereo, black with white stripes, cowl ind. hood.