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Jason when doing your spark plug hole once on angle how did you know where to machine your hole i.e. I know it's .813 but that's when it's horizontal, I could layout with a mark and use a wiggler once on 30* to machine the hole but isn't there a different way to accurately find the dim once the part is on the angle specified? I know the cam housing you put on center and rotated the rotary table the degrees specified and that was your dim. Is this the same? Could you some how mount this on a rotary table and rotate 30*?


Thanks again Bob.


??? ???

Heads set to 21 deg. for intake;

hoglet%20251.jpg


Intake bored;

hoglet%20252.jpg


Set over for spark plug bore;

hoglet%20255.jpg


Bore complete;

hoglet%20257.jpg


ready for outside contour;

hoglet%20259.jpg


Roughed;

hoglet%20260.jpg


finished;

hoglet%20261.jpg


cooling fins cut;

hoglet%20262.jpg


Test fit of heads;

hoglet%20276.jpg


Also radiussed the tips of the push rods;

hoglet%20245.jpg


And used a crappy tire die nut ::) to threads 4-40

hoglet%20246.jpg


which cut okay :eek:

hoglet%20249.jpg


Then faced to length and centre drilled the push rods;

hoglet%20267.jpg


And turned down between centres, (had no 3/16 AL)

hoglet%20271.jpg




Have a good day!
 
Scribe a line 0.813 from the ctr of the head.

Set work in the vice at 30deg and line up on ctr line

Use a pointed wobbler or "sticky pin" to pick up the position of the scribed line, with a good eye you should get to within a thou or two.

If you are not sure then shout and I'll mock up a photo.
 
Hi, Nice work ,please keep the photos coming.
Cheers,
Allen.

I was asking a question to Jason and quoted his post but didn't realize it'd repost all his pictures, he's done with the build. If you look thru this thread you'll see his progress.. all the way thru to the end. He has some awesome.. scratch that.. AMAZING talent!
 
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