400 BB build issues

Marcohotrod said

phreakish- post #1- 906 heads decked to clean up, block decked to clean up. volare said he ground/ported the water pump housing to match the block(sounds good to me) , not the water pump- sounds like u are not up on big block mopar. my engine runs below 212*, so it does not need a rad. cap

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Must have missed that, the drawbacks of reading from a phone. It does sound like things are squared away.. Though personally I would suspect the pump to an extent being that it's a known anomaly.

Even with an operating temperature under 212 the inside of the engine can run over that and cause local boiling. Doesn't take an expert in big blocks to understand that.. The resulting steam can and will push coolant out with force if not pressurized by a cap. Your engine may not do that, but it is probably in a better state of tune...

Every engine can be different and with the obvious tune issues (black plugs, idle issues) it could get hot fast.

Being that the heads have been checked several times already, I'd begin looking elsewhere. Cam timing perhaps? I've had engines off enough that they had the exhaust glowing in short order at idle.