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**Yukon Jack** · 05-30-2007, 12:13 PM

My 69 K20 has with 4.56 gears and heavy 35" tires and an SM465 manual four speed. I don't have any overheating issues and my cruising rpm's at 60 mph are about 2,500. This is with a 1989 carb'ed 454 with a mild cam, stock peanut port heads and ceramic coated headers. I have a 195 thermostat, new 4 core radiator and an Eldebrock aluminum water pump. I haven't made a radiator shroud yet. I use a mechanical clutch fan and do have an auxilliary oil cooler in front of the radiator.

05-30-2007, 12:13 PM	#3
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,689	Re: Big Block Cooling? My 69 K20 has with 4.56 gears and heavy 35" tires and an SM465 manual four speed. I don't have any overheating issues and my cruising rpm's at 60 mph are about 2,500. This is with a 1989 carb'ed 454 with a mild cam, stock peanut port heads and ceramic coated headers. I have a 195 thermostat, new 4 core radiator and an Eldebrock aluminum water pump. I haven't made a radiator shroud yet. I use a mechanical clutch fan and do have an auxilliary oil cooler in front of the radiator. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14 Last edited by Yukon Jack; 05-30-2007 at 12:14 PM.