I ordered a P&P head and when I got it, I noticed right away the head had been milled more than any I had ever seen. While comparing my stock LS head to this one, I measured .082. milled off. Has anyone ever seen an LS head milled this much????

I get from C-speed that the LS head has a Combustion chamber volume of
45.00 cc. I need to figure out my Combustion Chamber volume now. <U>How many cc's are taken out for every .010 milled off.</U>
Thanks!!!!

 

i think your gonna need to CC it yourself to find out for sure, its really easy.

get a graduated cylinder and a stand (in CC's obviously ) get a small square of plexiglass bigger than the bore of the cylinder. have a small hole drilled in it bigger than the end of the beaker or bigger than the stream of liquid that comes out of the beaker. use vasoline and apply around the edges of the combustion chamber. put the plexiglass on the cylinder with the vasoline and press it down. put a spark plug in the cylinder then start filling. i like to use rubbing alcohol because it evaporates extremley fast and cleans anything it touches without damaging anything. so while your CCing you can clean the head once its full with no air bubbles just look where the liquid sits on the graduated cylinder and your done!

 

I will do this and let you know how it comes out, thanks!!!! anyone else???

 

That would be the most accurate. That's how I do it.

 

I went to tractor supply and got the 60cc syringe. I will get the Plexy glass, and then I will know!!!!

 

I came up with 36cc for the combustion chamber volume. It was hard as hell to get all the air bubbles out. I made some measurements and came up with .090 of an inch milled off the head.

With CTR pistons and one 3 layer head gasket that puts me at about 14.5:1 CR

With CTR pistons and two 3 layer head gaskets that puts me at about 13.2:1 CR

As of right now I am running 240cc injectors, but now I am thinking 370cc injectors.

Anyone else got any thing?????

 

im thinking pump gas is out of the question.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kamin &raquo;</TD></TR><TR><TD CLASS="quote">im thinking pump gas is out of the question. </TD></TR></TABLE>

I may try to tune with 93 octane first with the 370cc injectors!!!!

 

is it me or are you being a little conservative with compression?
are you taling in consideration compression height of pct's?

maybe not, but im getting like mid 15's compression with a 36cc chamber.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dohcter g &raquo;</TD></TR><TR><TD CLASS="quote">With CTR pistons and one 3 layer head gasket that puts me at about 14.5:1 CR

With CTR pistons and two 3 layer head gaskets that puts me at about 13.2:1 CR

</TD></TR></TABLE>
These are the numbers I got.

 

if you are intending to run pump gas, I'd strongly recommend against using CTR pistons.

check the compression ratio with ITR, or regular B16a pistons.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mike-y &raquo;</TD></TR><TR><TD CLASS="quote">if you are intending to run pump gas, I'd strongly recommend against using CTR pistons.

check the compression ratio with ITR, or regular B16a pistons.</TD></TR></TABLE>

I have been running CTR's for about a year now. I wanted to be faster and ordered a head with P&P, 3-Angle valve job, and milled all to hell. I am not going to touch the bottom end. They machined too much off of the head and they assure me If I use it I will love it. So I am weighing my options before deciding not to use it or to use it.

 

first, a 3 angle valve job is pathetic for a high dollar head, this is a highly built engine a 5 angle should be the MINIMUM for you. second sure you will love that head if you run it till you detonate and blow your engine. thats gonna give you a crazy CR and i wouldnt touch it. even with huge injectors it wont matter.

 

you shure the head dosen't have welded combustion chambers, that could probably be the reason why you have a 36cc chamber, a friend of mine had his ls head milled and welded and it came out to be 38cc. Cause there is factory markings on a head that shows you the max to mill a head, its actually for resurfacing but you get my point, i don't think you can even mill that much of a head anyways.

 

I think it is just milled .090'' not welded. I will be very careful before deciding. The more I look into it, I think I will run 114 octane and 370cc injectors.

I see what you guys are saying..........Why risk it when I can just run race gas!!!