1G Turbo vs Non Turbo head

[JoshJosh]

I was wondering if the heads are different on a 1g turbo vs non turbo or if they interchange. I have a head with bent valves, and I was looking at remanufactured heads on ebay. They list that they will work on turbo or non turbo cars, but I was told that they are different.

Thanks

 

[9!'clipseDOHC]

The heads are the same but the cams are different. If your cams are good then go with the n/t head and install your turbo cams.

Hope this helps!

Edit: I just noticed you are non turbo. So you are looking to get a turbo head? Yes, it will work.

 

[ilco187]

if its dohc then they are the same, only the cams are different you dont want to use n/t cams on a turbo car, but you can use turbo cams in a n/t as a cheap 5 hp upgrade (so i have read)

 

[pj91gsx]

the valves on a turbo head are marked 6t, but i dont know if they are different than unmarked nt valves.

 

[JoshJosh]

Hmm. Anybody know about the valves?

 

[ilco187]

well i have a n/t head on my car with turbo cams, and has held up 4 years abuse, so i guess n/t valves cant take some shi7.

 

[bluestreak9999]

The exhaust valves and cams are different on a turbo head. Everything else should be the same.

 

[BogusSVO]

valves, springs retainers are the same for turbo or non tubo if you use the turbo head on a non turbo car, then there will be one oil port thet you will have to plug on the side of the head, it is used for the oil feed to the turbo... no biggie tho

 

[JoshJosh]

This is going on a turbo car. It is a 92 TSI. Is that oil port not there on the non turbo head or is it just plugged? Are the exhaust valves actually a different size, or what is different about them?

 

[hhuricane]

Everything is the same except the cams, valves included.

 

[bluestreak9999]

Both heads have the oil port but the n/t is plugged off. I have always been told that the exhaust valves on the turbo are sodium filled due to the added heat. As far as fitment they are both the same size.

 

[9!'clipseDOHC]

This is going on a turbo car. It is a 92 TSI. Is that oil port not there on the non turbo head or is it just plugged? Are the exhaust valves actually a different size, or what is different about them?

Yes they both have the oil ports.

 

[2fast4]

the valves on a turbo head are marked 6t, but i dont know if they are different than unmarked nt valves.

Sorry to cut in but on a related ? I recently bought a turbo 1g head. All the exhaust valves say "6T", but Intake valves had mixed markings...some are "6A" and some are "6T".

Can someone verify this? I don't know if the valves got swapped & I wanna be sure that I bought turbo head.

Aside from this, to tell the difference is that cams are different profile, but will not be easy to tell from just looking at it.

 

[91Bomb]

Bringing this old thread back since I drive a turbo 1g and have a good used N/T head lying around.


So since I have this good spare N/T head it would be good to save it for myself in case I needed it on my trubo car right? The only thing I'd need to do is remove the ?oil port cap? and I'm good to go?

Btw, i believe the valve stem seals are bad on the spare valve head so how much are a good set and are they simple to change with valve head off the car, is it hard to figure out for someone with no experience with them?

 

[Cdc1221]

Nope theyre cheap and easy to replace. I used pair of plyers and snatched them off. Look up towards the thread and click on the link on bogus' post and look at the head rebuild article. Tells you everything you need to know. Btw, the nt has a longer duration ex cam, so its a cheap slight upgrade

 

[91Bomb]

Nope theyre cheap and easy to replace. I used pair of plyers and snatched them off. Look up towards the thread and click on the link on bogus' post and look at the head rebuild article. Tells you everything you need to know. Btw, the nt has a longer duration ex cam, so its a cheap slight upgrade

Thx, i would swap cams if i ever needed to use it

 

[Jon91TSi]

Nope theyre cheap and easy to replace. I used pair of plyers and snatched them off. Look up towards the thread and click on the link on bogus' post and look at the head rebuild article. Tells you everything you need to know. Btw, the nt has a longer duration ex cam, so its a cheap slight upgrade

Don't forget about the valve springs needing to be removed.....

 

[91Bomb]

There's no 6-bolt/7-bolt motor differences on these are there? The spare N/T head is from a 6-bolt motor and car it would be used on is 7-bolt turbo.

 

[Jon91TSi]

There's no 6-bolt/7-bolt motor differences on these are there? The spare N/T head is from a 6-bolt motor and car it would be used on is 7-bolt turbo.

Head bolts are different, I believe the 7 Bolt studs are a smaller diameter,IIRC. And the intake manifold ports on a 7 bolt a quite a bit smaller, so you would need a 1g intake manifold, assuming this is going on a 2g.

 

[91Bomb]

Head bolts are different, I believe the 7 Bolt studs are a smaller diameter,IIRC. And the intake manifold ports on a 7 bolt a quite a bit smaller, so you would need a 1g intake manifold, assuming this is going on a 2g.

No, this would be swapping 1g 6-bolt N/T head onto 1g 7-bolt turbo motor

 

[Jon91TSi]

No, this would be swapping 1g 6-bolt N/T head onto 1g 7-bolt turbo motor

You should be fine with the swap then. Use the 7 bolt studs.

 

[91Bomb]

You should be fine with the swap then. Use the 7 bolt studs.

Probably good to use brand new bolt studs right? What about the intake manifold? Reuse current 7-bolt (1g) turbo mani or swap in my spare N/T mani that was mated to the N/T head?

 

[Jon91TSi]

Probably good to use brand new bolt studs right? What about the intake manifold? Reuse current 7-bolt (1g) turbo mani or swap in my spare N/T mani that was mated to the N/T head?

Get a set of ARP studs - EXTREME PSI : Your #1 Source for In Stock Performance Parts

Stick with the turbo manifold, it has all the vacuum ports you need. I believe the N/T has 1 less (BOV line).

 

[91Bomb]

Ok, so get new studs, change valve stem seals, remove oil port cap and slap it on? Is there any other inspection or prep before install of this used N/T head? It came off my old N/T car and was pulled while engine was running 100% silky smooth (did a part-out on car when tranny went bad).

 

[Jon91TSi]

Ok, so get new studs, change valve stem seals, remove oil port cap and slap it on? Is there any other inspection or prep before install of this used N/T head? It came off my old N/T car and was pulled while engine was running 100% silky smooth (did a part-out on car when tranny went bad).

As I said before, you'll have to remove the valve springs to get the seals. While the springs are out it might not be a bad idea to lap the valves quickly. I would also have the head checked for flatness at a machine shop, and have them make a pass with the mill if it needs it. Other than that just swap the turbo cams over, put it on the car and enjoy.