anyone have a .513 lift cam and stock heads?

Look on the lunati site and pull up the cam card. It should have the spring on the card.

I'd bet they recommend the double spring similar to the 995 comp spring.

Probably about $100 set. Another 40-50 for retainer and 20 or so for locks. Use 10* locks if at all possible. Better than the 7* pieces.

You're on the ragged edge for stock rockers. No chance stock springs work with that cam