hi i was wondering if someone could tell me how much i could plane my head but still be safe and run 91 octane gas, it's a ls block, ls rods, b16a pistons, b16 head, toda spec b cams, toda dual valve springs, b16 valves, oem b16 head gasket. if anyone knows that be great
thanks

 

anyone???

 

Limits of milling the head wouldn't be dictated by octane, you would run into clearance issues before you had problems with octane. Clay it, find out how much clearance you have now, measure the head to see how much has been shaved already. If you don't know about any of this ask your machinist. I also hope you have the ability to tune the car. Also, do you have adjustable cam gears?

 

thanks, and yes i can tune it, i have an apexi afc neo v tec controller air/fuel. and a wideband. also have skunk2 adjustable cams gears