Ada Racing Billet Head 42cc gain?

[Meen95z]

Looking into a Ada Racing 42cc Billet head, says +20 psi and 92 octane. All stock besides r&d intake grate and ride plate extension and beach house sponsons. What kind of gains could I expect?

[DavidR]

What I have read and the shop owner/ex racer that I have talked to says that the aftermarket heads don't do anything but look pretty. There is no cooling issue with the stock head and if you want more compression, they just mill the stock one. Save your money for something else. Mine came with the ski from the original owner.

[SplishSplash]

Like David said, don't waste your money. I had one. No rpm gain. Maybe a little better hole hot, but not much.