Hello i was wondering is there a difference between the turbo 3.1 and a regular 3.1? I mean besides the obvious, like are they different blocks? I want to build my current 3.1 to the tgp specs and add a turbo. thanx, and sorry if this was beaten to death but i tried a search.

turbo block is a tiny bit taller, and the crank is hardened.

I believe the blocks are the same..the heads are slightly different though(the reg ones are decked if I'm remembering right for that slight bump in compression ratio) ..I think it was sleeperred90tgp that posted this information on the w-body board.  Also the air intake temp sensor is located in the intake plenum/upper intake on the turbo 3.1 vs the regular 3.1 having it in the airbox.  The transmission is different from the regular 4T60's as well.  Sleeperred90tgp..if you could confirm/correct the head/block thing..please chime in so I don't mislead anyone w/ the wrong info :shock:  8)

EDIT: search the w-body(www.w-body.com/forum) in the TGP section...a lot of people have asked about turbocharging a regular 3.1 and the differences between the two have been covered a few times there.

Thanx guys, i figure the easiest thing to do is just build my current motor and t-charge it

Here are some of the differences.

Rods are about 1/8 wider at the wrist pin bore and have there own p/n. I did find n/a rods that matched. All the rods I looked at appear a little different in the beam area although the weight is about the same. Cam?s are perceived to be the same although I have never measured the duration, only lift.


W-body posts                     
                     
Pistons and  a little on heads                     
http://www.w-body.com/forum/viewtopic.php?p=65268&highlight=blocks#65268                     
                     
Head pictures and block deck hight. N/A heads are not shaved. Both heads measure the same from several machined surfaces.                     
http://www.w-body.com/forum/viewtopic.php?p=65154&highlight=heads#65154                     
                     
Picture of block. Humm, wonder what the T is for. Serial # has  the V in it. This is out of my TGP.                     
http://photo.starblvd.net/sleeperred90tgp/2-4-3-1075519372?m=1&pg=1&ro=3&co=2                     
                     
Heads the difference.                     
http://www.w-body.com/forum/viewtopic.php?p=65202&highlight=blocks#65202                     
                     
Cranks, there the same except for the first notch on the reluctor ring. Looks like a degree or two in initial timing.                     
Balance weight is within 2 or 3 grams. TGP on left.                     
                     
                     
The album if you want larger pictures. Page two.                     
http://photo.starblvd.net/sleeperred90tgp?st=album&pg=0

Thanx for the info guys it really helps me out, again thanx. Now i just gotta get the dough