Slickman, It's a stock 67' 400, 335 hp.
Had a reputable machine shop bore it 30 thousandeths over so it's probably about a 406 now. I'm sorry to say the new Rodney Red radiator did not solve my problem. Same temps. as my stock 4-core Harrison. I did replace the new Flow Kooler water pump with a Cardone and hammered the divider plate to such close tolerances that the impellers were just about dragging against the cover! Took off the new Hayden clutch fan and blade and replaced it with a 18 in. Flex-A-Lite fan using a 2 inch spacer like BobbyJ1 recommended. Removed the high flow, Mr. Gasket, 180 thermostat and put in a stock type 160 one with the 4 small holes drilled around the edges.Took Screamingchief's advice and used a VDV in my vacuum line after I went from port vacuum to manifold vacuum. Running 12 degrees at 825 rpm idle with a total of 38 degrees. After all this, the weather has dropped about 20 degrees here so I can't really compare apples to apples as to how much cooler it is running. I do think it has helped as it now runs about 170 at hwy. speeds and around 190 to 200 setting in my driveway. I have not let it idle for 15 to 20 minutes as I'm so gun shy, and tired of fighting this problem, that I just don't want to be disappointed if it should climb back up into the 220 to 230 range. Maybe I'll get over this and try an extended idle and hope for the best! Like I said, that's with an outside temp. of 70 degrees while back in the, Summer when it was running in the 220 to 230 range, it was 90 to 95 degrees. Everyone here has provided a lot of info. and suggestions which I am grateful for. I THINK my overheating may be solved by all of the things that I listed above. Seems that you just have to get the correct combinations of several parts and hope for the best. Sorry for such a long post but I just wanted to be specific in what all I had done to cure my problem. Thanx.
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