516 head question

other than the chamber, are the 452 and 516 valve location and geometry the same?
the 1730 retainer and the 1732 I got the 1732 it recommended with the 911 springs.

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Fundamentally the 516 & 452 are the same as far as parts usage goes.

The IH between a 1730 & 1732 should be the same.
I used a 1730 because that’s what I had on the shelf.