Hi, has anyone here messed around with the S&S B-1 heads?, specifialy, changed/modified the the combustion chamber shape?. What I am going to be doing is lowering the comp ratio a bit and originaly I was planning on just shaving some off the top of the B-1 piston but these pistons have bee lightened so I will be limited to where and how much I can take off. I got to thinking about the B-1 head and started to look at the chamber shape and started to wonder if I should open up the chamber a bit and get rid of some or all the angles these things have, to me it seems the exhaust valve seems kind of shrouded with this combustion shape?. I want to keep the squish selfs and not touch them at all, just thinking to open up the rest. The engine has a 14:1 static comp now, I was hoping to get it down to 12 maybe 11:1. Anyone out there done this before with these heads... does it make the chamber better or worse?

http://img379.imageshack.us/img379/1808/im004078dz2.jpg

http://img379.imageshack.us/img379/7997/im004081ol8.jpg

http://img379.imageshack.us/img379/3899/im004089lq1.jpg

http://img379.imageshack.us/img379/6950/im004079yt2.jpg

Does this mean you have abandoned the 4 valve heads. Those are some mighty fancy pistons.

Have you checked with S&S to see if they have a lower compression piston to go ith those heads.

Nope the 4 valve project is still a go, the only worry is the front head mount for a/the buell. For this other project I want to use what pistons/heads I have and just mod it/detune it a bit, thats the plan anyway.

To anyone interested, I found a bit of info on the B-1 heads/cly/pistons on the RB racing web site, btw these heads have 2.100 intake and 1.725 exhaust valves and they are suppose to be good for up to a 4.50 bore.

http://www.rbracing-rsr.com/113orca.htm

I also found the Megaflow site has some interesting pics and info with diffrent mods on the B-1 heads.

http://72.14.205.104/search?q=cache:ejv4jfxKclAJ:www.mega-flo.com/sns.htm+ported+S%26S+shovelheads&hl=en&ct=clnk&cd=2&gl=ca