Reply to "Air bleed holes in heads"

Larry

where are you plumbing those air bleeds to?

If you're copying JT, he has a surge tank (i.e. a true low pressure tank designed to collect air) in his Pantera. So his air bleeds actually work. The Pantera swirl tank as it came from Modena is an ineffective place to plumb air bleeds. Although I'll admit the heads should vent to the swirl tank OK.

Once you initially burp the air from the cooling system (raise the rear, then raise the front) air shouldn't collect in the motor, air will form at the pressure drops downstream of the thermostat and downstream of the radiator. That's where the bleeds need to be, but you need a true surge tank like JT's to dump the air into.

the way to cool a Pantera is a good radiator & lots of coolant flow. If your temps are truly creeping upward, perhaps the radiator is accumulating scale on the inside of the tubes, or perhaps the coolant/water mixture is getting old.

-G