If I take off the head witch has a new gasket and bolts torqued, will it damage the gasket ??

 

Yep! Gasket is only good for one shot.

 

mmm this gasket/head thing is a lot of trouble!

another question...
what should be the gap between the piston and the squish band ?
I think that's the way to see if the head has beed shaved ?

 

That's not a good way to see if the heads been shaved... because when someone shaves the head "PROPERLY" they also adjust the squish.
Setting the squish velocity depends on what your porting is set up for, and what your objecties are for your application. Not a one size fits all..

 

but not really shaved... just planned each time the piston and/or gasket was changed, to clean the surface. That may bump the compression. Cuz I want to see if the huge compression I have comes from that head planning. (or is it the normal compression [img]i/expressions/face-icon-small-shocked.gif[/img] )
The squish band is stock, the ports too, but its .080 over.

What should I do to see if the head is over shaved ??

 

I can't see minor plane work being a major factor of increasing your compression, typically you need to remove .035" or more to make any significant difference in compression.
The larger bore diameter increases the trapped volume, and will have a small effect, but shouldn't be significant.

Stock or close to stock compression on these is around 130 psi or so... Have you put a gage on it?
The big bore motors are hard to kick over when they are fresh. Most folks that haven't been around a big bore are surprised at this.

 

ok.. thanks a lot duneaddict

I'll try to find a gage and test it.

 

heyy I just thought about something... do I have to bleed the air from the head when I put back the coolant ??
It SEEMED like it had more coolant in the radiator than before I drained it, even if I lost some.

How do I do so ?

 

OH! let me guess... the smal hex bolt on the top of the head ?

 

Yep the small bolt on the head releases air from the coolant.