22r head shave?

[heepofajeep]

I was wondering what is involved in getting 11:1 comp. out of a 22r? How much must the head be milled down? Any changes need to be made to the valve-train?


I cut this from the LPG thread because it was a bit off-topic.

 

[mr4x42u]

shaving the head alone won't do it..you will need pistons too ,,at 11-1 I think pump gas might not be enough..

If you just shave the head too much you will have timing issues and will need a adjustable timing gear to help make up the difference..

a 20r head would be better then shaving the **** out of the 22r head..but agin,,all this on an old motor might just be a big ole can of worms..

 

[heepofajeep]

shaving the head alone won't do it..you will need pistons too ,,at 11-1 I think pump gas might not be enough..

If you just shave the head too much you will have timing issues and will need a adjustable timing gear to help make up the difference..

a 20r head would be better then shaving the **** out of the 22r head..but agin,,all this on an old motor might just be a big ole can of worms..

This was spurred on by the propane thread, so pre-detonation on LPG will not be a problem. I can do a 20r head, but that means more parts to round up, so if I could make do with the stuff I've got, it would be cool.

Stupid question, but how does shaving the head alter the timing? Also, what pistons would you recommend?

 

[mr4x42u]

I'm not all sure whats availabe,,but some dome style pistons would up the compression..

I have not looked at the propane thread,,,but I know many guys who run propane on older motors with no problems..