Machining a Harley-Davidson Twin-Cam Manual Compression Release

[@ShortBlockCharlie]

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[@soberalmario]

I use manual comp release that fit betwen the spark plug hole and the spark plug. I know this kind of com releases put more far away the spark, but work for me

[@36ELGALAN]

Where did you get your comp release valves Soberalmario? I've been looking for releases that go between the head and plugs and can't find anything

[@jackhuber19]

Where can I get the tool to do the compression releases

[@Andy78244]

The chamfer for the tap is probably in the form cutting tool, and why would they spend the time dialing in the head on a mill, when they have a fixture?

[@tattoohenry6906]

Can I go back to a single plug ?

[@tattoohenry6906]

How do I reverse the process ? Hello hello how do I reverse how do I reverse the process back to single plug only

[@ajb15002]

Very cool........ Where is your shop?

[@MrWyldewood]

noticed a couple of things that should have been done, before tapping threads you should have a champher on that hole, and why in the world would you do all that by hand when you have a spindle and use quick change collets?

[@stevemiller7654]

This fixture can also be used on the motorcycle without disassembling the vehicle. I have a bud who does this work in his back yard shop. no need for a Bridgeport.