16 replies to this topic

[Prospero]

Hey all,

Searched but seems that I can't find results since all my topics are less than 3 letters. LOL, gotta love that!

Anyhow, I have a great T5 head and a ~90k mile GLT short-block that I wanted to marry up.

The motor has about 90k easy miles and had the timing belt tensioner pulley die 20k miles after the timing belt was replaced. My parent's mechanic wasn't aware of having to replace the pulley, I guess. Anyhow, the engine is great but the GLT head is trashed. So that being said I was thinking about rebuilding this motor with the T5 head that came off of Heavy Iron's car. It's ported, polished, and has a 3 angle valve job on it. So rather than it all going to waste, my plan is to rebuild the GLT block with the T5 head... then sell it for a good price.

Original engines are both from 1998. Donor block with internals is GLT and head is T5.

Planning to do the reassembly of the bits this weekend and then list it for sale. Need $$$$ for our wedding this summer.

Cheers,
Prospero

[Deimos]

I suspect they don't mate up quite right as the T5 is an 81mm bore and the LPT is 83mm... but I could be wrong.

[Deimos]

Wait, ignore me, Vadis says they're the same part #...

[Keaton85]

All turbo heads from 94-98 will fit any N/A or turbo.

All N/A heads fit any N/A but won't work in turbo models unless the exhaust valves are swapped.

Note: some 94s have a 93 build date which can vary but are rare. Also 99+ heads will work as well with some modifications.

[Deimos]

please delete, on 27 January 2012 - 11:17 PM, said:

All turbo heads from 94-98 will fit any N/A or turbo.

All N/A heads fit any N/A but won't work in turbo models unless the exhaust valves are swapped.

Note: some 94s have a 93 build date which can vary but are rare. Also 99+ heads will work as well with some modifications.

The NA will work, just might crap a brick if the EGT gets too high.

[erikv11]

Deimos, on 28 January 2012 - 12:18 AM, said:

The NA will work, just might crap a brick if the EGT gets too high.

To put it another way, the NA head will fit just fine, but then it will very soon contain one or more burnt exhaust valves.

[NEU]

Prospero, on 27 January 2012 - 04:15 PM, said:

Cheers,
Prospero

Cool color! You're out by Dulles?

[Deimos]

Has anyone ever actually demonstrated that the sodium filled valves are a necessity for a stock LPT engine? Doubtful. So don't get pissy over it.

My point was that you don't have to swap the valves for it to be functional, which is correct, and for an LPT it may be a non-issue.

[Keaton85]

Your welcome to find out! But I personally will take the little time/money and swap them or use the correct head configuration.

[erikv11]

But has anyone ever actually demonstrated that the NA valves have a good lifespan in a stock LPT engine?

If they have, great I stand corrected. But if no one has ever checked ... well there might be a good reason.

I'm not getting pissy, I just think it is bad advice to tell someone to go for it in this case. Why take chances when it comes to engine internals, IMHO a head swap is not very fun to do over again.

[Deimos]

Where did I make any advice about it? I stated it would work, which is true, contradicting please delete. I also CLEARLY stated it would have a chance of premature failure. You're arguing with me by saying... exactly what I said in the first place?

please delete, on 27 January 2012 - 11:17 PM, said:

All N/A heads fit any N/A but won't work in turbo models unless the exhaust valves are swapped.

All I did was point out that this statement is not true. It will work just fine, just has a shorter life expectancy. It's not like the NA exhaust valves make it physically not fit or function, which is what that sounds like.

And since the OP is using a nicely done T5 head, he's fine regardless.

[Keaton85]

Key word here "UNLESS the exhaust valves are swapped"

I did NOT say it won't bolt up....

I could put up a nice 19T to my N/A vehicle as well... umm maybe shorter life span?

bolt up***

[Deimos]

please delete, on 28 January 2012 - 02:46 AM, said:

I did NOT say it won't bolt up....

Ohrly?

please delete, on 27 January 2012 - 11:17 PM, said:

All N/A heads fit any N/A but won't work in turbo models

Sounded like it.

And if you want to really split hairs, the head fits and works fine, the valves are different. Two different parts. And ya, you could bolt a 19t onto an N/A and run it just fine. Assuming you didn't add anything else, like piping to the TB. And even if you did, if you regulated boost to 5 psi and you upped the fuel flow a little... you'd be golden. Just cause it's a 19t doesn't mean it would nuke it right away.

[Keaton85]

Yup, if you take out the UNLESS statement...

That's like saying, it will be sunny, UNLESS it rains.

How should I have worded it, "The N/A head in particular will bolt up directly to a MY94-97 850 and 98 V70/S70/C70 model vehicle with any motor type. Although, if you were going to use the N/A head in an application on a turbo motor, it would be highly advisable to replace the N/A exhaust valves with turbo valves for a longer life expectancy"

F#$%^in hell? you want me to get some gurbers with that and hand feed you?

[Prospero]

Wow, I came back to this party a little too late!

Cool, so that is what I really needed to hear. Thanks for the help and for the hardcore laughs

Cheers!

please delete, on 27 January 2012 - 11:17 PM, said:

All turbo heads from 94-98 will fit any N/A or turbo.

All N/A heads fit any N/A but won't work in turbo models unless the exhaust valves are swapped.

Note: some 94s have a 93 build date which can vary but are rare. Also 99+ heads will work as well with some modifications.

[Deimos]

please delete, on 28 January 2012 - 03:05 AM, said:

Yup, if you take out the UNLESS statement...

That's like saying, it will be sunny, UNLESS it rains.

How should I have worded it, "The N/A head in particular will bolt up directly to a MY94-97 850 and 98 V70/S70/C70 model vehicle with any motor type. Although, if you were going to use the N/A head in an application on a turbo motor, it would be highly advisable to replace the N/A exhaust valves with turbo valves for a longer life expectancy"

F#$%^in hell? you want me to get some gurbers with that and hand feed you?

No actually, it still sounded like it with the unless statement. Sounded like you're saying those valves won't fit. Which was wrong, sorry I corrected you and got your panties twisted.

[Prospero]

Yep, right off one of the runways in-fact. If they miss... I'm a gonner!

NEU, on 28 January 2012 - 12:56 AM, said:

Cool color! You're out by Dulles?