[SRGN]

Originally Posted by pfilean

SRGN - your experience is interesting. I'm still running the old 4 bolt but it does have a cast impeller. But it sounds like we are now at about the same result. When I ran my test route with the AC on I saw generally about + 7-10 degrees. I have the condenser and also an oil cooler in front. I run my oil through the radiator cooler before the remote oil cooler.

I forgot to add, I changed the timing chain while it was apart. I wonder if the wear on the chain was causing retarded valve timing which likely would have contributed to running hot. The chain really wasn't that bad though. I reset the ignition timing afterwards to 34 degrees all in by 2800 without the vacuum advance connected. That's where I had it before as well. Mine is the 10.25:1 compression 389.