Thread: Ideal temperture thermostat for SBC?

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If you run the poppet style drill a small hole, around 1/8" in the flange before installing. That little hole will let all of the air in the block bleed out during fill, instead of having to fill it as much as you can, then starting the engine and trying to "catch" it when the T-stat opens to burp air. The little hole makes the process sooooo much easier.

Originally Posted by rspears

If you run the poppet style drill a small hole, around 1/8" in the flange before installing. That little hole will let all of the air in the block bleed out during fill, instead of having to fill it as much as you can, then starting the engine and trying to "catch" it when the T-stat opens to burp air. The little hole makes the process sooooo much easier.

i think they have i check valve in the popet ones if not a 3/16 hole or two would not hurt . if he as a big air lock they can be a bitch to get out i had one in the chevy went around and around with the guy at stewart i had just a shim on stat . he kept telling me i had a air lock in the rad ? well he must of been right .at the time i could not see how he was right but he was