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it is basically a heart shaped design, and is pulled in adjacent to the valves, which does put a little hurtin on the mid-lift flow numbers.

the OOTB flow in the mid-lifts isnt too good, but they do respond well to some tweeking.

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Those comments sound like what Brian H. (ou812) said about testing the latest BB Victors that have a smaller (more Indy-like, IMO) chamber.

Just out of curiosity, does the difference in valve seat material between the original Performer RPM and later E-Street heads mean that you'd expect the E-street valve job to get pounded out faster w/ the same spring loads, etc.? Or would they be more prone to being damaged from running high(er) spring pressure?

Also, do they come w/ the same valves, or are the E-Street parts more budget-oriented and come w/ cheaper and/or heavier pieces?

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it is basically a heart shaped design, and is pulled in adjacent to the valves, which does put a little hurtin on the mid-lift flow numbers.

the OOTB flow in the mid-lifts isnt too good, but they do respond well to some tweeking.

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Just out of curiosity, does the difference in valve seat material between the original Performer RPM and later E-Street heads mean that you'd expect the E-street valve job to get pounded out faster w/ the same spring loads, etc.?

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Just out of curiosity, does the difference in valve seat material between the original Performer RPM and later E-Street heads mean that you'd expect the E-street valve job to get pounded out faster w/ the same spring loads, etc.?

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What difference is there in the valve seats?

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If your running a stainless valve or a Titainimum valve you need the correct seats in the heads to match the valves used