[Excaliber]

This may be way to technical to get a response on here, but I'm going to try here first anyway!

WHY are my exhaust temperatures "seemingly" higher than they USED to be.

My OLD engine: 12.5 to 1 C.R. with a .030 below the deck piston height and solid roller cam AND very rich mixture with the center squirter "drag race" only carbs. Cranking compression was 240 psi.

My NEW engine (re-build): 9.8 to 1 C.R. with ZERO deck height piston and "street" solid tappet cam. The piston position was raised specifically to introduce "squish" (some call it "quench", same thing) to the combustion chamber. This enhances and "makes better" the "burn" when the fuel ignites. New carbs are typical 600 cfm vacuum secondary Holleys. Cranking compression is 200 psi.

My NEW engine seem's to be running considerably higher exhaust temperatures than the old setup. This remains true even if the carbs are "leaned out" with small jets or made to "run rich" with BIG jets.

Question and speculation:
Is it possible the "squish" "quench" thing has so enhanced the combustion chamber "burn" THAT is what accounts for the higher exhaust temps?