im planning on putting my B17A head on a type r block. if i mill (deck) the head 30 thousandths, would this be safe? as in piston to valve clearance? and also, where do you think my compression ratio would be?

by the way, im using a stock head gasket and CTR intake cam, dual valve springs(OEM type r)......block will NOT be decked or milled.....


any help would be kindly appreciated.....

 

http://www.c-speedracing.com

look into there clay topic under how-to.

Clay your engine and then figure out from there.

 

You shouldn't be milling or decking to gain a higher cr. You should invest in a mugen head gasket or similar setup that will lower the cr. Also look into higer cr pistons. Milling the head is only viable if there is damage to the head ie a scratch that would prevent the head gasket from properly sealing. It also throws off the timing and is basically looked down upon for gaining cr.

 

Mostly what he said.

Milling can be used in moderation. But pistons are the way to go if you want any performance gains. Milling it is just a means to an end... and the trouble you will possibly have are unforseeable until you've actually done it.

The clay test is a good indication for valve clearance, however, it still won't tell you what timing problems you're going to have, and how much you're going to be off.

 

ok, thanks for the replies.......

another question then, what is the SAFEST or the most you can RESURFACE your head.....meaning when is the head useless? i know there are indicator marks on the head which tells you something, ?........so basically is 30 thousandths still ok to use the head?

the indicators are show that there is still enough play, so im assuming that i am safe, hopefully that is =\

 

I'd talk with a local, reputable machine shop in your area to see what they think they can do.

Outside of that, I'm going to have to let the number techies tell you what will and won't work.

 

every .010 taken off is .2 compression. just some info to help.

 

so if the tabs are untouched....can u be safe from tapping..
gsr head milled .40
b16a block(p30)
ctr cams...can i tune still...and be ok on clearence since its using all vtec parts and not like say a stock ls block..

 

No the tabs are only there to ensure the head is still with tolerable usibility, i.e. still strong enough and has enough metal between certain areas to hold itself together.