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Old 05-05-2019, 12:34 AM   #6
40 Deluxe
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Join Date: May 2010
Location: now Kuna, Idaho
Posts: 3,064
Default Re: Relieved Ford V8 block

Relieving drops the compression, which causes slower throttle response. Not good for a street engine! Also, think of air flow into a flathead engine: The air/fuel mixture flows upward through the intake valve, then has to do an abrupt, almost 180 deg. turn to fill the cylinder. Air has weight, so therefore has inertia, meaning it wants to keep flowing up from the valve. Obviously, the head forces it to turn. So the majority of the flow follows the head surface around into the cylinder. Thus, flow through that ditch you just ground into the deck surface will be small at the RPM levels of a street engine. I think it's a bad tradeoff to give up compression for slight improvements in high RPM airflow unless it's an all-out race only engine.
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