Could you then mill the 140 heads to get the smaller chambers and higher compression?
You could, but the cost to mill negates the benefit. Cheaper to find a set of #141 or #18 HO heads. You would be milling 50 thousandths off the deck and may have to mill some off the intake for geometry.
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1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.
