no using oem size pulleys, just in aluminum, no heat coming out under the front end, I have somewhat figured that the heat is trapped in the engine bay @ slow speed, and yes the bbc is fat, I had to have headers built to go over the frame rail & dump at the rear of the front fenders then go back under the frame, so I have probably blocked the air flow going around the engine, do you think installing small 7" electric fans in the inner fenders to pull the heat out? or would header wrap work?