I just purchased a head off ebay that came with SS valves, a port job, and "a max mill" as stated on ebay.

Well when i got this, I was like SH*T this thing is maybe over milled?

OK for the head. When looking at it laying upside down, valves facing up(all closed). The valves actually are sticking out of the head(a little). So if I take a ruler and lay it, or try to lay it flush, it will not lay flat/flush on the head. The valves are in the way(sticking out), just slightly. I hope you know what I mean.

Is the head too milled, those valves are scaring me, especially with my setup.

B18b 81mm
Ctr pistons on ls rods, ls crank
crower valvetrain
crower 405a ( I'm real concerned with my valve to piston clearance with these cams and this head)
Using a 3 layer OEM gasket or is there a thicker one I could purchase)


Thanks Guys
John


Look at those valves sticking out.

Same here









Ok so here is the head, That crack on the head, is that going to be Ok??

Tell me what you think even if its CRAP.
Modified by volcom40street at 2:49 AM 2/12/2005


Modified by volcom40street at 2:55 AM 2/12/2005


Modified by volcom40street at 3:17 AM 2/12/2005


Modified by volcom40street at 3:18 AM 2/12/2005

 

Clay your engine to find the answer!

 

going to do that for sure, just wanted an answer if possible. The mark that usually inticades how far to mill the head is gone so...

I'm in the process of building this motor slowly but surely. I wouldnt want to put all my valvetrain in this head and have it be no good. I'm going to go to the machine shop(bensons her in Cali) and have them take a look at it or if someone could recommend someone that would be great.

Thanks John

 

I guess the best thing to do would be to ask the seller exactly how much has been shaved off.

Other than that, Cometic is a reputable brand that makes various thickness headgaskets, thicker than the OEM 3-layers are available.

 

Just emailed the guy I bought head from so we'll see...

Thanks guys

I'll try to get pics up tomorrow so you guys can tell me if its a good port job

 

morning crew

 

if the OUT OF SPEC mark is gone ,i think its milled at least .30. OUCH. have fun being at 15:1 compression with CTR pistons LOL, man that sucks. Find out more info

 

If you want to try a thicker than OEM headgasket I think a Cometic would do the trick. I haven't ever heard of any real problems with them.

 

get a custom thick headgasket and then clay. proper torquing of the head should probably make it ok.

 

There are a couple of round or square (depending on year) cast markers on the head near the dowels on the surface of the head (intake side), if these have not been cut the head has not been surfaced too much. Wish I had a photo but I do not.

 

Pics up peeps, let me know either to trash this thing and keep the valves or use it.

I paid $190 for this head so if it no good. I can just say I got Stainless Steel valves for $190.


Let me know

 

I'm 99% sure you will run into piston/valve contact.

I have CTR pistons in my LS, ported LS head milled about 10 thou, stock size valves, Colt Race cams (less lift than 405a's) and I'm damn close. At the veyr least, clay your motor - don't learn the hard way.

Good luck.

 

my head was shaved .040 and it didn't look that bad ..
like everyone said thicker head gasket would work

 

port job looks kinda ugly in that pic, u might wanna try clean that up if u do get the clearance issues worked out. That might be tough, you go some big cams, and pistons that stick out of the hole.

Good luck though

 

double up on oem head gaskets. That will grab ya another .029 or so. looks like your gunna need it. I probably wouldnt attemp to clay that thing without doubleing up. use 2 oem headgaskets and clay. see where your at, and if you got room you can always take apart the oem headgaskets.

 

More info


The head is beat, right. Maybe I will just put these SS valves into my stock head. I think they are oversize so I will let machined shop do.

 

Ok first of all, who ever ported the head is not a very skilled craftsman. In one of the pictures you valve guide on the left side actually got the right tip broke off by it. BTW, I will second the piston / valve contact comment above. Take the valve train and the valves and sell the head to someone wanting to you a flatter piston with larger reliefs. You could always try some P30 pistons yourself.


EDIT: Seen your above post.

> Oversize valves will only cause more problems with this piston / valve issue. Besides the are not worth it in so many cases because of the cam use limitations.

 

ttt

 

Your going to use all your gear adjustment to get the cams even close to spec.
Glenn

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NJIN BUILDR &raquo;</TD></TR><TR><TD CLASS="quote">Your going to use all your gear adjustment to get the cams even close to spec.
Glenn</TD></TR></TABLE>


What....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by volcom40street &raquo;</TD></TR><TR><TD CLASS="quote">


What.... </TD></TR></TABLE>

Milling the head throws off the timing slightly. ALOT of milling = more than slightly. At least thats what I'm assuming he meant.

 

Just measure the valves sizes.

33mm intake
28mm exhaust

NOOOOOOOOOOOOO Vtec size. Not good with my setup


Good Lord I'm skrewed with this head.

 

I think that head is been milled all to ****! To help Cometic makes thicker head gaskets: .045 or .055 I believe.

Also the port job does look a little crappy, that doesnt mean it is a bad job. Most race ported heads are just ported and not polished! Polishing is just done for looks and can actually cause carbon to build up faster.

Where did you get the head from? Who did the work? With that milling you may have to use a smaller dome piston to keep from hitting valves, but you can still obtain 12.X:1 to 13.X:1 with no problems!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hybrid_vtec &raquo;</TD></TR><TR><TD CLASS="quote">I think that head is been milled all to ****! To help Cometic makes thicker head gaskets: .045 or .055 I believe.

Also the port job does look a little crappy, that doesnt mean it is a bad job. Most race ported heads are just ported and not polished! Polishing is just done for looks and can actually cause carbon to build up faster.

Where did you get the head from? Who did the work? With that milling you may have to use a smaller dome piston to keep from hitting valves, but you can still obtain 12.X:1 to 13.X:1 with no problems!</TD></TR></TABLE>

It was done by West Coast Cyclinder Heads, they guy said???

 

bump