Just receive my head with the release install.I hope everything is ok.The small hole is not near the spark plug but on the flat of the head.I put the gasket on everything is ok it clear the gasket.
i put my head on the cylinder and it clear,The picture i saw on a another forum the hole was near the spark plug hole. I hope the release will function normally !!!

 

I have a question. I hope I don't sound stupid. But is the compression release so that when you build a higher CC engine you can release the comp on a cylinder and it starts easier? Or is there something else to it? That machine work does look clean.

 

it is not where mine is at but... from what i can see, no problem..

 

I don't know man. Looks a little close to the mating surfaces. Check out the picks below.


http://www.hotbikeweb.com/tech/0306h.../photo_17.html

http://www.rbracing-rsr.com/turbo/orca_tcb2head2.jpg

 

It might promote detonation where it is. Should be in the combustion chamber and not in the squish area, but it will do what it's suppose to do.
Ron

 

Heres where mine were placed........

 

yes, the compression release so that when you build a higher CC engine you can release the comp on a cylinder and it starts easier--easier on the starter and battery

 

I would not be to happy with it drilled there, kinda to late now though. It will probably be fine but I havent seen one installed like that before. But that doesn't make it bad.

 

I've never seen the vent hole in the deck. I've always seen them in the chamber.

However, it'll probably be fine.

Who installed them for ya?

 

Ok, just thinking. The hole for your compression release is probably going to negate the reinforcment band on the gasket. This means that you will be running a HC motor with a reinforced gasket that is no longer reinforced because the mating surface has been compromised. Not sure if that made sense but good luck with it.
Honestly, if i were you I'd try and get the machine shop to fix it or replace the heads.

http://www.delkron-mfg.com/products/...end_kit_lg.jpg

http://www.stateseal.com/images/motor3.jpg