06-04-15, 10:43 AM
1. Engineering shop should be able to sort off centre hole. Depending on how off centre may have to go oversize but could helicoil insert to bring it back to 6mm or use a stepped stud 8mm in head and 6mm for exhaust clamp.
2. Fine if others done it then no problems with drilling into oilway in head.
3. New (used) head could bring new problems you would only find out about after putting it all back together.
Shouldn't need to do cam chain after 18k
If engineers shop reckon hole to bad to retap at 6mm I'd go for helicoil and fit stainless stud/threaded rod
2. Fine if others done it then no problems with drilling into oilway in head.
3. New (used) head could bring new problems you would only find out about after putting it all back together.
Shouldn't need to do cam chain after 18k
If engineers shop reckon hole to bad to retap at 6mm I'd go for helicoil and fit stainless stud/threaded rod