I have a 12G940 head that has been reconditioned but the machine shop did not want to attempt removing what is left of the bypass fitting in case he ruined the head.


The bypass is approximately flush with the face of the casting and It is still reasonably thick.
The choices are:
1. Easyout
2. Weld a bolt in it and try and screw it out
3. Put a piece of 10mm bar in it and weld it up.
4. As the bore is 10mm it could be tapped M12 and a plug screwed in.
5. Drill it the root diameter of the current thread and try to peel out the rest of the bypass thread.

What have others found to be successful.
I’m happy to not use the bypass as I was intending to plug it anyway.

Phil

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Find a job you love and you will never have to go to work !

Bring to me and I will remove it. I have replaced heaps over the years. Worse than yours..
Clamp on mill.
Drill 9/16" diameter.
Tap it in mill, original size, 5/8-18 UNF.
I can supply a brass fitting that won't rust like originals.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Thanks Kevin
I’ll give you a call/text to arrange a time.

Phil

_________________
Find a job you love and you will never have to go to work !

Fixed

_________________
Find a job you love and you will never have to go to work !

Hats off to drmini for his generous offer, great to see!

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1972 Leyland Clubman, 4EFTE 1330cc Turbo, 220Hp on 17psi
(1/4 mile: 13.8s @108mph @168Hp)