Compression Release Machining

[Don D]

I am looking for a machining diagram. I thought many years ago Harley published a suggested machining diagram for 10mm compression releases.
I have done only a few sets and they worked fine just in front of the spark plug but I was not exactly happy with the depth needed and it is tricky. I want to document set depths and angles for future work
Any help appreciated.

[Cracked Head]

I think custom chromes hi po evo heads put theirs between the pushrods on opposite side. I was just looking at junk evo head and saw all sorts of casting in that area. I may be wrong, but on their heads you could put an extra plug,or pop off release.I would part with head if you wanted,just cover shipping.

[prodrag1320]

Thats were i put them (in front of the plug).ill get you the angle & depth tomorow when i get in the shop

[Matt C]

Don, fwiw: Kirby's diagram worked very well on the last set of EVOs I did.

[Don D]

First things first, I fixed my twin cam tool. Now I will make the EVO tool. I decided to use the left right on the Twin Cam but will use in front of the plug on the EVO.
Thanks to all that helped.