Originally Posted by 496CHEVY3100
somrtimes finding the problem can be hard to find ,and most of the time it is something small overlooked on my red Z28 I have an engine that was originaly built for a dirt circle car so it needs lots of cooling ,it has Air but I cant run it,i put a 160 thermostat alun heads 4 core aluminum radiator with the munual 6 blade flex fan and a 14 in electric fan and a high volume water pump when I put it together to avoid any overheating problems,But that didn't work either, it ran around 210 when driving around 50 mph but if I drove 60 65 it would overheat 230+ in less than 1/2 mile so I could slow down the temp would drop, I tried removing thermostat and using a restrictor like we use in our race cars (a flat disc with a 5/8 hole ) still hot ,tried an adjustable timing retard MSD it helped some I changed to 2 1/2 in exaust helped a little,then a fellow racer told me to see if the shaft driven fan and the electric fan shaft were in line with each other if not they were fighting against each other ,restricting air flow and remove the high volume water pump circulated to fast fpr radiator to cool ,Thet were not so I moved the electric fan down where shafts align and replaced pump with a stock one ,it stopped running hot about 185 at cruise 65-70 with 411 gears but I still cannot turn on air it will run extremely hot in less than 1/4 mile.
the previous post is my truck
Thanks for the info David! I'm leaning towards not enough radiator, as I've always found BBC engines to run warmer, and thought the triple pass aluminum radiator might handle this, even though it was smaller at 19"x24".
I ran a monster 19"x32" on my 427 in the '71 Camaro, and it rarely got over 165 cruising, and maybe 190 at extended idling in hot weather. I'm need to decide if I can add cooling area without major modification, and hope that does the trick.