Trick flow heads: different installed valve height

I'm passing on the Mahle pistons on the advice of my machinist. He informed me that the ring pack is light weight, only 9 pounds of tension on the rings. We're searching for a forged replacement in the 10.2-10.4 compression ratio to work with the cat piss 92 octane gas available at the pump for $4 a gallon.

Buy different rings.