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Rodsaknockin

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just got done porting and polishing my j heads took them to the machine shop to get seats cut and guides ect and the machinist called me and said he hit water on the second intake valve these were 2.02/1.60 valves. What are the chances and is there a method of repair that can be trusted ?
 
he hit cutting seats? Epoxy and put in a hardened seat. I think that would be ok. Even a guide can be slathered and pressed in for a repair. Head guys confirm this?
 
cut a pocket for a replacement seat. New ring in an old hole.
 
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If he hit water, will the new seat cover it? 2 part hi temp epoxy in the break and follow it with pressing in a new seat. Lots of heads have epoxy in the intake ports from porting, the sealing area of the valve seat is the OD of the seat where it has a .005 interference fit with the head. The Serdi is going to cut a perfect circle at a fixed depth. The seat will fill all the area the serdi cut including the break so I think youll be OK if he seals it and them presses in the seat.
 
Why would he press in a hardened seat for an intake valve? TO go larger, you just cut the new larger diameter seat right over the OEM seats. You don't go as deep so the seat is further out in the chamber. There's no need for a new seat ring.
 
I agree with moper. Something is wrong. No reason to put seats in the intake.

I'd never try and reuse that head. I don't care what you seal it with, it will fail.

I'm trying to understand why the port work was done without the valve job at least roughed in to .020-.025 and then the port work done. You can't establish bowl diameter without the valve job done, or close to it.
 
I had small hole in intake right near the valve seat. I used. Balzona super metal. It is NOT cheap! $260 a kilo. It stands up to the alcohol in pump gas the best. No issues for over two years.

0B57CA82-30E4-42DA-A262-CD7D3160B6A5.jpeg
 
Thanks for the tip Furry
and agree- why new intake seats at all
and why not do the exhaust seats and guides and rough in the valve job first
 
I'd like to see the heads and talk to the machinist before I said he did something wrong. I've put new hard seats under the intake valves. Did someone tell him they wanted all new seats?
 
Thanks for the tip Furry
and agree- why new intake seats at all
and why not do the exhaust seats and guides and rough in the valve job first
'Cause some people don't have the experience of a 'Rider' or a 'Rosey' and have never been exposed to the proper methods. Some people grind right down under the seat into the bowl and ruin the flow in some lifts. Maybe they make the bowl too thin? How much experience does the OP have porting heads? Did he hack out the bowl and grind too far into the head?

No trial, just hang the machinist!
 
I can remember when straight down the bowl from the 45 was all the rage (sbc)
I always let the Serdi do the work with several cuts below the 45 (well below the 30 with low lift cams :)
a little hand blending and Done for most applications except "heads up"
 
No trial, just hang the machinist!

Given the info provided - yes. Only because I can't think of a reason why the machinist wouldn't say "You don't need that for what you're doing."
 
I'd like to see the heads and talk to the machinist before I said he did something wrong. I've put new hard seats under the intake valves. Did someone tell him they wanted all new seats?


I've done it too, but not under all 8. I also used ductile iron seats and not the hard seats.

I had a BBC come in that looked like it sat in a lake for a decade, and outside with a cat pissing on them for another decade.

I had to put 2 seats on the intakes on both heads. Sometimes you do what you do because the customer just had to have those castings.

Don't want to hang the machinist. Just want to know why he is doing what the OP says he's doing. Unless the OP is fibbing a bit...
 
Given the info provided - yes. Only because I can't think of a reason why the machinist wouldn't say "You don't need that for what you're doing."
By the same no proof reasoning we can hang the OP. The machinist was try to save an already destroyed cylinder head. Even if the new seats didn't fix it, they weren't any worse off than useless.
 
All you need to do for that argument to hold water is quote where the OP said the head was destroyed when he brought it in...
 
Are we even sure it's an intake seat? How do we know that the OP isn't crossed up and said intake seat when he means exhaust seat?

That sounds more likely.
 
All you need to do for that argument to hold water is quote where the OP said the head was destroyed when he brought it in...
The OP "just got done porting and polishing" his heads. Is he going to use a 3/4 race camshaft too?

"and polishing" tells me we are dealing with a rookie here, as would a 3/4 race cam. He didn't know what he was doing because of the procedure and terminology he uses.

It is doubtful he would take a head in for guides and seats if he knew they were destroyed. Given his skill level, would he even recognize the same?

Really? "I took my ruined heads in for seats and guides!"

Maybe the machinist is being a nice guy and not saying, "You really screwed these heads up boy!"

Come on, my son ruined a 100 heads before he got really good at porting.
 
The OP "just got done porting and polishing" his heads. Is he going to use a 3/4 race camshaft too?

"and polishing" tells me we are dealing with a rookie here, as would a 3/4 race cam. He didn't know what he was doing because of the procedure and terminology he uses.

It is doubtful he would take a head in for guides and seats if he knew they were destroyed. Given his skill level, would he even recognize the same?

Really? "I took my ruined heads in for seats and guides!"

Maybe the machinist is being a nice guy and not saying, "You really screwed these heads up boy!"

Come on, my son ruined a 100 heads before he got really good at porting.



Your son was a quick learner. Took me more than a hundred heads to get the hang of it.
 
I have pressed in seats in all 16.

Im not sure what the issue is here, i also dont like that pic, where is the bowl?

With some heads you hit water...and others mostly you don't.
Some heads you can really make flow gang busters over brother castings by adding to an already 'by pure chance' bitchin as cast short side... its chance finding really good cores.
Live and learn.
Im sure if he is competent he can figure it out.lol
 
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I have pressed in seats in all 16.

Im not sure what the issue is here, i also dont like
With some heads you hit water...and others mostly you don't.
Some heads you can really make flow gang busters over brother castings by adding to an already 'by pure chance' bitching as cast short side... its chance finding really good cores.
Live and learn.
Im sure if he is competent he can figure it out.lol
This ... My machinist, I paid to look at of garbage BBC square port heads .Paid 5 bones for bare castings ...
He fixed the loose ,mis machined guides (way too looosse..) with bronze inserts, and a aggressive component called "fluidweld " ... Fixed it all..
Not exactly sure ,on the name of the product, called my machinist 10 minutes ago no response.
 
If I was the OP that head and the other would be turned into Tire Irons.... Been down this road when I was young, dumb, and well you know the rest.... Cut your losses and get a set of Aluminum heads or a set of documented and ready to go Cast Iron heads from someone reputable..... It may or may not be in the budget but fixing what I see is just a disappointment in the future... There have been some nice deals on Cast Iron heads for sale here recently and very reasonable IMO....

Good luck,
JW
 
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