Why don't you simply drill two holes in your guide block? One to match the
drill size and one to match the tap diameter.
Greg G.
Osseo, MN
> Im planning to heli coil the threads on my inlet manifold on my Stag. To
> make sure the drill is perpendicular to the surface of the head, I plan to
> have someone make me a 1 inch thick block and drill a perpendicular hole
> in
> it. I plan to use this as a guide.
>
>
> My issue is how to I make sure the Recoil brand of tap I have goes in
> perpendicular to the hole in the cylinder head? Im not sure what a Heli
> coil tap looks, like but the recoil brand does not have a long taper.
>
> Should I make another 1 inch block with a hole, tap that first, and then
> butt the 1 inch block up against the cylinder head and then tap the
> threads
> in the head through the 1 inch block block? Is this part over kill?
> Sujit
>
> --
> Sujit Roy, Realtor
> Cupertino, CA
> (408) 839-8359
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