516 head question

Cartel said

that was the 516? thank you for checking it. From what I seen milling down is a no go so yes I better look closer

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Yeah that was a 516. It would be a good idea to buy an install height mic. If you have calipers you can install a valve with a retainer and keeper's together. Just pull up so the valve is seated and measure from the spring seat to the bottom of the retainer, that will get you really close.
It's very easy to do and you can set up your own heads
If you need to take a spring to a shop and have it measured, I guarantee they won't charge much.