Not a Reply....just a short note! I got a custom piston ring from Frank Bowman and installed it in my Supertiger .75.The custom ringwas a perfect fit & the engine has not been run yet, but alreadyhas verygood compression. I look forward to racing my friend who runs a .90 Tiger on his bird! Every engine I put a Bowman ring in had more compression...and intake suction...a good thing. Thanks Frank,

Capt,n