Compression release installation angle
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Seasoned HDF Member
Joined: Dec 2012
Posts: 6,665
Likes: 502
From: Orange County
I found this on another forum, I just don't understand the 2-5/16" measurement. Is it from the spark plug?
What I do is:
Measure in between the head bolt(short one on the intake side},and the spark plug hole 2 5/16" from the outer fin.
Center punch the spot.
Set the head up on an angle plate set at 15 degrees.
Use a wiggler or other method to keep the quill on the center punch mark.
Spot face with a 3/4" center cutting end mill.
Chuck up a 11/32" drill,and drill down 3/4".
Chuck up a .090" drill,and drill down through the chamber.
Set up a 10mm. tap,cut threads,and you're done.
What I do is:
Measure in between the head bolt(short one on the intake side},and the spark plug hole 2 5/16" from the outer fin.
Center punch the spot.
Set the head up on an angle plate set at 15 degrees.
Use a wiggler or other method to keep the quill on the center punch mark.
Spot face with a 3/4" center cutting end mill.
Chuck up a 11/32" drill,and drill down 3/4".
Chuck up a .090" drill,and drill down through the chamber.
Set up a 10mm. tap,cut threads,and you're done.
Last edited by Road Star; May 15, 2017 at 08:26 PM.
Thread Starter
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Seasoned HDF Member
Joined: Dec 2012
Posts: 6,665
Likes: 502
From: Orange County
Thanks!
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Joined: Sep 2009
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From: deland,florida
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