Hi,
So i bought this head, JG Pro Series Gen 2 head from a buddy of mine through a shop. The car was wrecked therefore it was being parted out. The shop pulled the head off the car, inspected it and told me it was in perfect condition. They said the car ran fine. The head has about 3,000 miles on it, it was boosted on also. They said its not stamped because it was done as a side job. I trust the shop along with the guy who sold it to me.

I have a fully built bottom end that cost me about 3500 dollars that im putting this head onto. So to make a long story short, im afraid this head will fail on me and drop a valve or do something horrific like that. Therefore I'm taking this head to Endyn, a very good local machine shop. They will:

- Flow the head to ensure ports are even, that way it will run right.
-Test Spring Rate
-Check for cracks
-Check valve guides, seats, valves,
-Mill the head
-Re assemble it

What other tests should they preform to ensure a good head, that wont fail and damage anything when ran?

They said if it is uneven flow, they can go and work the ports to get them even, IF the ports are small enough.

So i have attached pics of the head, with pics from EACH intake port, along with pics of the retainers, springs, and valves.

Please let me know if the ports are big enough in which they cannot be worked anymore.















Now most of my buddys are telling me that im paranoid like ****, and should calm down and just take the shops word by just putting the head on the new block and running it.

The shop is well know, i trust them along with many others that trust them. I understand if the ports are different, it wont run right. But i want the main things such as dropping a valve etc...

Head mechanic of the known shop inspected it thoroughly, cleaned it up. It actually belonged to his brother.

Im afraid of that. If my 3500 dollar bottom end ***** up, i wll be fucked in the *** for life. Probably wont be able to finish my build for another year. That would suck

So engine builders, machine shops, tuners, even regular HT members give me input on the tests i should get done and the work of the head.

Thanks Alot

Cliff Notes-
- What tests should i do in order to ensure the head wont fail on my brand new 3500 dollar block
-Are the ports big enough in which they can no longer be worked anymore?
-What do you think of the whole head?

Thanks

 

bump, desprate for input.

 

clean job

 

Thanks. Do you think the tests im getting done at the machine shop is enough to guarantee that nothing wlil happen?

Are the ports able to be worked a little more incase they are un even?

Thanks Alot

 

just put the thread in all motor, thin kit will do better over there.

 

Why do the valve guides have machining marks?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dogginator &raquo;</TD></TR><TR><TD CLASS="quote">Why do the valve guides have machining marks?</TD></TR></TABLE>

Not sure. Will that mess it up? Is it fixable? Will it cause damage?

Thanks Alot

 

The valve guides are easily replaceable. I'm surprised that they were installed when the porting was done.

 

Just take it to ENDYN. They are the best in the business. Anything that needs to be checked, I am positive Larry will check it.

 

Im taking it to Endyn for sure. Altouhgh need more input...

Thanks

 

anymore input?

 

You can have em vacuum test it for valve seal. *shrugs*

 

why do the seals look worn or something?

Thanks

 

Like I told you before, that is DEFINATELY NOT a JG port job. I will tell you this once more and one time only......you need to start listening to me man, seriously.

The porting is just a clean up, ALL JG ports are polished on the exhaust side and they replace the valve guides with machined guides for better flow. Wo ever did this "port" job used a sanding drum and got into the guides (not that important). They did a basic job of cleaning the transition of the valve seats and did a little cleanup of the runner roof. Also, another thing that JG does that this "porter" did not is that they knife edge the dividers for better flow.

The person who did this port did and alright job but it is definately not a JG style port service. The runners look like they are just fine and there are not any adverse differences between the runners that would cause your vehicle to run inporperly.

At best, this could be considered a mild port service. The best way to tell if it has been really ported or if it is just cleaned up is to take the intake gasket and see if it has been matched to gasket size. If the holes in the intake gasket are identical to the size of the ports then someone has gasket matched the ports.

If you have any more questions, IM me on AOL.......and please take my advice.

 

Ok Thanks for Advice.
I'm going to go ahead and run this head on my car, im afraid of something going wrong though. I will take it to Endyn to have it checkedd before i run it on my car....

What tests should they do other than the ones listed?

Thanks Alot

 

No it doesnt look worn. You just seem to want to do every test available. Everything has been listed.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDM00SI &raquo;</TD></TR><TR><TD CLASS="quote">Thanks. Do you think the tests im getting done at the machine shop is enough to guarantee that nothing wlil happen?

Are the ports able to be worked a little more incase they are un even?

Thanks Alot</TD></TR></TABLE>

Nothing is ever guaranteed! Especially with cars. Even though you are going to have a reputable shop look at it does not mean it will not fail under hard racing conditions. Taking it to a shop is just an inspection that the head is in good shape at that time. If you trust your friend who sold it to you then you really don't have to spend the extra cash to get it checked out.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DirtySol &raquo;</TD></TR><TR><TD CLASS="quote">Like I told you before, that is DEFINATELY NOT a JG port job. I will tell you this once more and one time only......you need to start listening to me man, seriously.

The porting is just a clean up, ALL JG ports are polished on the exhaust side and they replace the valve guides with machined guides for better flow. Wo ever did this "port" job used a sanding drum and got into the guides (not that important). They did a basic job of cleaning the transition of the valve seats and did a little cleanup of the runner roof. Also, another thing that JG does that this "porter" did not is that they knife edge the dividers for better flow.

The person who did this port did and alright job but it is definately not a JG style port service. The runners look like they are just fine and there are not any adverse differences between the runners that would cause your vehicle to run inporperly.

At best, this could be considered a mild port service. The best way to tell if it has been really ported or if it is just cleaned up is to take the intake gasket and see if it has been matched to gasket size. If the holes in the intake gasket are identical to the size of the ports then someone has gasket matched the ports.

If you have any more questions, IM me on AOL.......and please take my advice.</TD></TR></TABLE>

This guy serisously knows a lot. I always see him giving usefull information.

 

Yeah also the owner of the shop, is the one who inspected it and pulled it off the car.

 

looks good to me. they modfied it where it counts: near the valve seat. so i can only imagin it wasnt some dumbass with a dremel type job.

from me

 

thanks...

Anymore comments on retainers and springs?

 

THAT'S NOT A JG HEAD!

Jesus fucck, all this time I was waiting for you to post picks and here you've gone and started a new thread on me...


1. There is NO red dye around the ports! Look at the JG website - see all that red stuff? That's permanent dye (never comes off) that you'd still see to this day if it was a real JG head.

2. The valve guides are NOT cut! JG cuts off the valve guides where they enter the ports (so you'll only see the valve stems when you peer down the ports). This is rather important for increasing flow...

3. JG stamps "JG" into the head at several locations. I don't see them where they should be...


Sell that pooper on ebay. Buy something good instead.

 

Also, look how caked up that head is. That was obviously a turbo motor, running in the 12:1 range.

I'd bet my life that your valve seats are caked with carbon.

Cleaning up that head will be such a headache. Sell! sell! sell!

 

I was also thinking of just replacing the whole valvetrain to a Supertech Valvetrain. Since i already have a ported head. I was also thinking of getting the head flow tested to confirm the the ports are good.

What do you think

 

the cleanup is ok, they actually did not do too bad of a job when they did the CLEANUP but it is not ported even close to JG standards or processes.

I honestly think you should sell it as a ported head on Ebay or here on H-T, becasue that is what it is. It is NOT a JG head but it is definately ported "decently". The person who did this was not a hack becasue of some of the transfer work done but it was definately not done by a professional or by a professional porting shop.

You could pull 650-700 easily for that head the way it is possibly more on Ebay.