Im currently building an ls vtec setup and ive already read up on how to build it reliably and right. I already tried searching this so dont chew me out about it lol.

My problem is that i bought a gsr head that has been milled down pretty significantly(not sure how much). But Basically the round combustion chambers arent completely round anymore. Therefore the compression is going to be no joke with a stock head gasket and b16 pistons, other than that the head is in great shape. I know that im supposed to use b16 pistons cause the valve reliefs on the intake side of the ls pistons arent big enough and the b16 pistons will fit the ls rods without any fabrications. I was going to use the pr3 pistons because the p30's would be a little too high compression for the mild all motor setup im building.

But my big worry is the valve/piston clearances i will have. Since its been milled i have no idea how much clearance i will have. My idea/theory is to cut/mill out the valve pockets on the pistons a little to compensate for how much was milled off the head and use a multi layer head gasket (3 or 4 Layer) and then clay it up and check the clearances, i wasnt going to use serious aftermarket cams either. Mybe a ITR Exhaust cam and a CTR Intake cam. Thats My theory, Let me know what you think. Im also trying to find out if there are any other b series vtec pistons that will work with ls rods that dont put the compression up as much as the pr3's and have a little more piston to valve clearance. Ive seen/heard of people using ls pistons and getting decent results from it but they're compression ratio was only like 9:8. I want to be around 11 but dont want to go past 11:5 compression With enough clearance to maybe run those cams i listed above.

Please let me know what you think. There are many point of views, so just let me know what you think i could or should do. Any suggestions would be appreciated

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HondaBurger &raquo;</TD></TR><TR><TD CLASS="quote">
My problem is that i bought a gsr head that has been milled down pretty significantly(not sure how much). But Basically the round combustion chambers arent completely round anymore. </TD></TR></TABLE>

The chamber isnt round to begin with on a gsr head!!

 

What i meant was that it looked like this

http://www.jgenginedynamics.co...N.gif

instead of this

http://www.c-speedracing.com/h...2.jpg


the Combustion chamber is smaller and not rounded like the other pic.

 

thats cause the top one is a gsr head, the bottom is a b16 head.. the chambers are different

 

so your saying the stock gsr combustion chambers look like the ones in the top pic? If so this completely solves my problem. please verify thanks!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HondaBurger &raquo;</TD></TR><TR><TD CLASS="quote">so your saying the stock gsr combustion chambers look like the ones in the top pic? If so this completely solves my problem. please verify thanks!</TD></TR></TABLE>

You got it pontiac!! Clay it up then decide your next course of action.

 

yup your good to go. the gsr's have the quench pads

 

sweet, im taking the whole setup to my buddies shop today to clay it up. Thanks for the help guys

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4g hatch &raquo;</TD></TR><TR><TD CLASS="quote">yup your good to go. the gsr's have the quench pads</TD></TR></TABLE>dont all honda heads have quench zones? you can cut enough off of any head and make it look like that. i have a d16a6 head that looks like that.