Hey guys I'm building a monster miata with a new GenIV Ly6 truck motor that comes with the L92 heads and I'm putting on a fast 102mm intake. My thing is I'm looking to find the highest lift cam without changing the rest of the valve train. It has roller rockers stock and from everything I've read the lift is limited to 525-550. But which one won't hit the pistons and not need to change the springs too?

 

dirt_track_racer_81 is going to run L92 heads milled .030 with his 242-248 .615 112LSa...checked the PTV the other day and found he can run a much larger cam. his pistons have -2cc valve reliefs

 

I'd HIGHLY recommend changing the springs and pushrods while you're in there. Those springs/pushrods as a combo have been shown to cause valvetrain instability on STOCK camshaft, let alone aftermarket cams with more aggressive lobe profiles.

We've got some spring/pushrod packages starting at very competitive pricing that would be a tremendous value for your combo!