Finally got a running 65 C10

[HotWheelsBurban]

Anyone know what size tap a spark plug hole would take on a small block?

Should be a 14mm; I would think there is a special made tap/thread chaser for that. Do you have a well stocked parts store near you?

 

[1low4x4]

Should be a 14mm; I would think there is a special made tap/thread chaser for that. Do you have a well stocked parts store near you?

Yeah, and I also have a couple hundred piece tap and die set from northern tool so when I get back from lunch, I’ll check that out. Going to Harbor freight right now to get another hydraulic jack from my engine hoist. It quit hoisting and it’s super old, all the O-rings are blown out of it and I’m done with it.

 

[bucket]

The older heads used a larger spark plug. The change happened in '70 I think.

 

[legopnuematic]

I would get a back tap/chaser from a local auto parts store over using a cut tap to chase the threads. Especially over a cheaper cut tap. A lot of times they [cheap taps] will cut oversized on the major diameter.

I don’t know for certain on sbc head spark plug holes, but a lot of automotive components have a thread form that has a radius instead of a sharp V profile at the major diameter, this removes the potential stress riser and makes a stronger thread. A tap will cut that radius out and make it a sharp vee. Maybe it would make no difference, but I’d go chaser over cut tap.

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[vr1967]

Nice looking old 65. Kind of partial to them, as still have the old 65 my grandfather bought new here in the little town I live in. Still got the 230 and 3 on the tree.

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[1low4x4]

Guess the 283 is just not meant to be. I wnt to harbor freight to get a replacement jack for my hoist and boughtr the wrong one. went back, got it, got the drivetrain out, was pressure washing the engine and it fell over, slamming to the pavement. I'm going LS, **** this. I dont have the patience to mess with this old junk anymore anyway. The oil leak was coming from an expansion plug where the oil sending unit shouldve went, btw...and possibly/probably a head gasket as well.