NA head- turbo

j and v said:

The N/A exhaust valves will hold up for a while if you keep the boost down. If it was me, I'd go get my good turbo head, even if the machinist keeps the door locked. Take an N/A head to another <a onMouseOver="javascript:window.status='machine shop';return true;" onMouseOut="javascript:window.status='';return true;" href="http://dingalone.info?v=1%2E26&ss=machine+shop">machine shop</a>, have them install oversized hardened exhaust valve seats (boport.com). That'll keep the valve seats from cracking on the exhaust side from the extreme heat (really common with the factory turbo heads) Put in some oversize valves, and have fun.

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