Helicoiling Heads

[simontink]

OK Thanks.

[edd]

Good points Julian. I did look at all the sparkplug threads and decided they were all good. I will take up your suggestion of a trial fit of the inlet manifold before final assembly. I did all the drilling and tapping using a pillar drill so they should be square but you never know.
Cheers
Roger

Hi Roger. If I had my time again I would helicoil all the spark plugs. Mine looked great and I cleaned then up with a tap. The trouble comes when the metal just starts to give way. The strength in the thread metal isn't what it used to be. I would trial fit every plug as I had to helcoil one of mine in situ and I have another that ok but just feels not 100%
Easy fix after but just lots of fuss.
Edd