Agreed. Typically a big block runs hotter during idle and cooler while driving, not the other way around, and it certainly shouldn't be running at those temperatures you mentioned. I have a big block and it rarely ever goes over 190 at idle and stays under 180 while driving. It could be the timing as one of your friends mentioned, however the timing and/or vacuum advance would have to be fairly off to produce those kind of temps.
1. Can you describe your fan setup(mechanical, electrical, type of shroud)?
2. Do you have aluminum heads, or an aluminum intake manifold, or ceramic coated headers, or an aluminum radiator? Each of those can help keep things a little cooler.
3. What temperature does your thermostat open at and have you verified that the water is flowing through your radiator when your water temp goes past the thermostat's temp?
4. What's your timing at idle and at 3000 RPM?
-Chris
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Chris Robinson
1969 Camaro SS/RS, 489 ZL-1 MPFI, T-56 Mag
Last edited by chr2002ca; 12-18-2009 at 12:44 PM.
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