I had the head taken to a shop to have the chambers enlarged to match the 84mm bore of the cylinders, and they took it upon themselves to also deshroud my valves (except #4 chamber as can be seen) and also in the process skimmed some of the valve seats! The ysaid I need to lap the valves in order to have a good seal...but will that ensure a perfect seal or do I need the seats ground now?

You can see when the valve seat was ground on (right upper side of chamber)


This is chamber #4 where the valves were not deshrouded as can be seen.


This is chamber #1 where a "good" (?) job was done on deshrouding the chamber and the seats were not affected (much)


Two more pictures of chamber #1

 

You could put the head together just install the valves and do a leak down test, but since you have it a part you might as well have them reground to ensure a good seal. Some of the seats do not look that great from the pictures.

 

Dude, those seats are eaten up. Definitely get a valve job done before assembly.
And I dont mean lapping, I mean a full on grind with a machine.
And that spot facing looks kinda halfass..... I hate to be a downer but it looks
real shotty. Perhaps you could take it somewhere else to have it cleaned up,
because I wouldnt take it back to whatever place you took it to in the first place.


[Modified by sgT, 4:27 PM 11/30/2001]

 

Did you have a discussion w/ the machine shop after you saw the results of their work?

 

Yes I talked to them and they "Assured" me tha ta lapping job would be enough...but Im very doubtful! Oh man this blows!

 

HX guy, do you have a spare head? i know you are hoping to get your motor together soon. IF not i have one you can borrow until you get the one you hvae fixed. You are just going to have to pay shipping on it. I hope i can be of help if you need it.

 

there are too many pits in the seats. I wonder what the valves look like.
get a valve job done.

 

sgT: I was wondering about that as well..what are those pits from?

I can get a spare B20 head for $50 from a friend..and I think Ill do that so I can get the car running. Ill keep this head and do a valve job on it..and maybe some new bigger valves.

 

the pits are from the valves sitting down on debris.

I would put this one on and send the other one to portflow instead.

 

I really dont know what to do about this.
I called them back and explained that I did not ask for the valves to be deshrouded and the valve deshrouding looks to be the reason why the seats were ground.
Also I told them that I did not ask for the quench pads to be touched, yet they were.
He said that he assumed that I would be getting a valve job done before reassembly (which he said is standard procedure) therefore that is why not too much care was taken on not grinding the seats. Also he figured that since this is a performance engine, deshrouding the valves and blending the quench pads would be good.
He said in the end that they will do a valve job for $80, half the price they noramlly charge.

What should I do? Just go ahead and pay the $80 to do the valve job? Send it else where to have the work done? Just use a stock B20 head instead?

 

have him do it with a stipulation that if you dont like the way the work is done on the job that you will not have to pay. you can put the money into a new head ftom your friend. that way you arent losing too much

 

that doesnt look very professional..............have they ever done that type of work before? it doesnt look like it from those pics.

start saving up for a good P&P job from port-flow........

 

I will save up...but what should I do for now? Pay the $80 to fix this head? Buy that head off my friend for $50 and use that?

 

Wow, a valve job for $80? Send your head to Tom at Portflow. He will take care of it so you don't have to buy a new head.
http://www.Portflow.com
(310) 257 0351

 

Are you saying a valve job for $80 is a good or bad deal?

The thing is, I need to get the car running..and I am low on funds. It would take me at least a month to save up enough to send the head to Portflow.

 

80 bucks for a valve job sounds like a real deal to me.......my machine shop wants about 250 bucks for a 16 valve head.......

 

Their usual price is $200 for a 16 valve head...but since its already dissasembled...and since they are (sorta) at fault for what happened, they said they would do it for $80.

 

i dont know man............i think i would take it back to them have them fix up the chambers as best they can and do the valve job........or you second option is to get another head to bolt on for now while this one is being repaired......some of those valve seats look really crap.

maybe a 3-angle valve job cant fix it........it's not just a matter of grinding the valve seat/face. you have to look at the installed valve spring hight as well. if they grind the seat in to much the valve will be seated to high up in the head resulting it a high valve spring retainer hight.........they gotta measure before and after the valve job is done and they should check the specs in the helms manual.........

good luck.........

 

The shop should replace the head due to the fact that they ignored your instructions and carried on with their own plans. You should post this stuff on http://www.theoldone.com if you haven't already. They might give you more aptable input.

 

Shiittt ,you can lap all you want! Those seats need to be cut. If #4 wasn't deshrouded it looks like somebody sneezed and ran the grinder collet on the edge.