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Why buy new Dart IRON heads for nearly $1000 when you can buy better aluminum for a few bucks more? Seems like something you'd definately regret later on... I'd rather save up a little more and fork over $100-300 more for Dart Pro 1's, Canfield's, Trick Flows, or AFR's which not only flow better, they're aluminum.
J1008-4145-5, 400 Small Block 18° Dome 4.155" X 3.875" X 6.000" <--That part number is for JE Piston rings for a 4.145" bore motor. Secondly whats 18° dome? Domes are measured in CC's, however there is such a thing as 18° pistons, for 18° valve angled heads. Standard SBC's valve angles are 23° (like the Dart heads you had selected). You definately dont want 18° pistons.
Lastly, as asked above, whats your goal with this motor? What kinda cam and compression are you thinking about?
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