Another thing to consider is the tune. How much timing is the engine running under freeway cruise conditions?
Timing that is too retarded for cruise conditions can put a lot of heat into the engine.
For a Gen 1 SBC, somewhere in the area of 48-54 degrees of timing at light load cruise is usually where the engine will be happy, be the most efficient, and generate the least heat.
Does your distributor have a vacuum advance canister, and is the canister properly tailored to the distributor's advance curve and your engines vacuum characteristics?
If the radiator is clear, the water pump is good, and the thermostat is good, I'm betting on not enough timing.
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1969 Chevelle
Old setup: Procharged/intercooled/EFI 353 SBC, TKO, ATS/SPC/Global West suspension, C6 brakes & hydroboost.
In progress: LS2, 3.0 Whipple, T56 Magnum, torque arm & watts link, Wilwood Aero6/4 brakes, Mk60 ABS, Vaporworx, floater 9" rear, etc.
Last edited by Blown353; 05-27-2008 at 07:54 PM.
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