Back to cam stuff here, cylinder pressure. Too much or too little will make it run hotter as well. Prime example...
My father's green 72' SS 454. In his sage wisdom, let a local shop handle the rebuild and pick out parts. It's mismatched, doesn't have enough DCR & SCR. It is down on power, and runs got. Has a HUGE Griffin aluminum radiator, Hayden HD fan clutch with a factory HP fan, and a the proper fan shroud. Hoses are good and don't collapse, WP is a new HD unit, etc. Without the AC on, it runs almost 190* at cruise, and will creep up to nearly 200* in traffic. No way a mild 454 only bored .030" over should do that. It ran 15-20 hotter when it had a smaller carburetor on it. (too lean) Have you read your spark plugs lately to see what they reveal? Just curious, hate to see you throw parts at it.
I'll be changing the cam, and upping the SCR though milling and thinner head gaskets. I am positive that it will run 10-15 degrees cooler after the changes.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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