wondering why the koso head has a dome in it, would'nt that make less compression. the stock head doas not have a dome. which one should I use? Also doas the use of another cylinder require a different plug. by the way it's a eton 70 viper im workig on. stock other than cylinder

 

Use the koso head the stock dome is not very good desighn from what i hear. If you order a aftermarket high comp head from any big name the dome will be just like the koso head!

 

Plug:: BR8HIX
Your prolly using a plug with a "P" in it.
Use the Koso head. it will have more compression than the stock head.