It's not the size of engine compartment. Yes, the heat does play a factor. Are you running a shroud? It does help. Your re-built motor. What is the over bore?
Current combo is .020 over 340, stock cam and exhaust manifolds. Wiend intake with Holley 570 carb.
Cooling system consist of New 3 core radiator, Milidon performance water pump and matching thermostat, new factory fan shroud and MP clutch fan from Mancini racing. Fan is app. 1/2 inch from radiator.
Base timing is 10 degrees, engine idles smooth with 15 inches of vacuum at idle in gear.
Last night, I replaced the MP clutch fan with a solid 7 blade fan. Have not had time to test it other than it seemed to be louder at idle and was pulling more air through the radiator. We'll see.
