I have not done a check for piston to valve clearance lately.

But Last I checked w/a cam of around 230 degrees duration @ .050 & a valve lift of .550" lift,,,I had a mile of clearance.

So basically speaking,,,unless you are running a big camshaft,,,I think there is no reason to have valve reliefs.

The angle of the cylinder head is less than a standard SBC of 23 degrees IIRC.

Two cents thrown


MBHD

12 port SDS EFI