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Re: 2010 ford 4.6 blows nipple off intake
Posted to Technical Discussion Forum on 6/21/2026

I haven't measured a 4.6, but on the old 3L pushrod V6, they would happily build 45psi in the block at higher RPM with the thermostat shut. This is by design, as high block pressure keeps the coolant from boiling at hot spots in the head.

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