Quote:
Originally Posted by goatcheese
I have the same exact symptoms going on. I also used an IR themometer with the same results. I have an aluminum radiator with electric fans, checked the water pump clearances, etc.
I bought a new water pump (PWP381) from cardone that's supposed to have an improved impeller. I was gonna install it tonight but, looks like I better check my timing instead. What's funny about mine is it ran cool for the first 75 miles or so then overheated. It now will overheat while idling or driving only a mile or so. The distributor is tight so I know it didn't move. I will check it this evening.
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The problem with mines so far seemed to be the vacuum advance. The initial timing was where it needed to be but the vacuum pulled in way to much timing way to fast. I should max out at 36 degrees of timing but I was hitting 45-46 possibly more at higher rpms. Without vacuum it will max at 36 and the mechanical curve seems great for this motor so far. Also I should mention this is an HEI distributor not the points style.