HYD ROLLER CAM Regrinds

Garrett Ellison said

Same friend who had to send the magnum heads back bought one of the engine tech cams and sent it to Ken. He got a .506 (1.6 magnum rocker ratio) 209/214 @.050 on a 108 LSA out of it. Going in 5.9 and will be used in an '85 club cab 4X4 used for heavy towing.

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I bought a Hughes regrind years ago and it was 214/216 w .510 valve lift. - worked great.

This ebay seller has regrinds w 228* @ 0.050” w 1.5 rocker .525” valve lift -

I was just wondering how much can you regrind a cam?
Regrinding a stock cam,
You don’t have a lot to work with.