273 Piston Question

RustyRatRod said

Wow that's a good bit smaller than I would have guessed. I bet the "norm" I was talking about is for modern pistons with extra room machined in for more valve clearance probably.

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Yup, Pishta told me I was off... so I HAD to measure one! I was using a larger number based on your same thinking; the 'norm' would be the deeper 2.5-3 cc per eyebrow rather than this small .75 cc per eyebrow. A big cam would have piston-to-valve clearance issues with these small eyebrows.

FWIW.... The great part for the later 273 flat-tops is that the CH is so tall that they are near zero deck..... works out something like .002" below nominal deck height. That's why the SCR did not drop into the toilet on these later 273 engines even with the larger, open chambered 675 head. Took me a while to learn all of this; sounds like 66fs has been down that road long ago LOL.