Thinking about GTP internals

[AllTheGoodNamesAreGone]

I am considering swaping to gtp internals

from what I have found thus far

1) crank = same, pistons = different, connecting rods = differnet

2) a full set of pisons and rods can be had for about $600 from gmparts direct :eek:

3) this will lower compression but how much? becuase the gtp heads are different as well? what will the over all compression be with just the pistons?

thats about it..

what are your thoughts?? i plan on adding these when I pull my motor.. which will be for a full rebuild, head work, and a cam..

[Nachius]

I beleive compression on the L67 is 8.5:1
You can get some "used" L67 internals for pretty cheap from like clubgp.com, The L32 rods are 20% stronger and 1% ligher than the L67s, and bolt directly to the L67 pistons.
The heads are different I beleive because of the injector holes. As far as flow I don't believe it's any better.

For boost this is a good "fairly" inexpensive move other than the labor the parts are reasonable.

[Wicked 3800 V6]

Eh, don't get em until you need em!

[asdf1234]

I bought a GTP shortblock that im swapping in for $100. Pretty good deal if you ask me.

[Turbo V6 Camaro]

Originally posted by Nachius:
I beleive compression on the L67 is 8.5:1
You can get some "used" L67 internals for pretty cheap from like clubgp.com, The L32 rods are 20% stronger and 1% ligher than the L67s, and bolt directly to the L67 pistons.
The heads are different I beleive because of the injector holes. As far as flow I don't believe it's any better.

For boost this is a good "fairly" inexpensive move other than the labor the parts are reasonable.

i was told 9.0:1

[Mighty Thor]

So your doing the Stephan way?

I wouldn't mind taking that direction myself. I'm going to wait though till my mileage is really way up there. I think it would make it a very good engine to take both SC and N2O.

Say, have you thought about ceramic coated pistons? I wonder if they are any better.

[Turbo V6 Camaro]

Originally posted by Mighty Thor:
So your doing the Stephan way?

I wouldn't mind taking that direction myself. I'm going to wait though till my mileage is really way up there. I think it would make it a very good engine to take both SC and N2O.

Say, have you thought about ceramic coated pistons? I wonder if they are any better.

yes they are better in many ways, thats why i spent the extra $230 on them....

for nos they would be great too....

it stops heat soke into the piston. and the coating on the side reduces friction also.

i would say if you got the monye go for it

[RedFrk13]

L36 head and L67 are identical except for the injector holes just like Nachius said. The L67 compression is 8.5 to 1.

[BirdOfPrey01]

They are worth it.

i belive the pistons go for 41$ per piston w pin

and the rods go for 39$ per rod.

Thats about 550$ tax included.

Good deal but you can buy forged pistons for about the same ammount.

www.gmpartsdirect.com

If you want to go really strong. Get yourself some cheaper forged pistons from "Ross Pistons"

Then go big on the rods. I would recommend forged Steel Connecting rods. They shouldnt cost too much.

[AllTheGoodNamesAreGone]

good insight..

yeah.. for the money, I think i may go with an aftermarket piston..

but i have read good things about the series 3 GTP connecting rods..

from what I understand they have a special coating that makes them a little stronger..

we will see.. I think its worth the money..

[nocutt]

Wait till you need 'em, your tune is the most important component here...the second known fastest time on a stock bottom end 3800 is about 10.x s @ over 120mph Eaton charged Front wheel drive! There are numerous in the 11s with heavier vehicles...a testament to the L36 bottom end...you can't believe everything you read!! In my opinion an L67 is not necessarily a better investment over an L36 when pound for pound the L36 will always have the advantage till maybe if you are compressing air over 2-bars...and still yet the advantage will lay due to your tuning window diminishing...

[Turbo Kyle]

Originally posted by nocutt:
Wait till you need 'em, your tune is the most important component here...the second known fastest time on a stock bottom end 3800 is about 10.x s @ over 120mph Eaton charged Front wheel drive! There are numerous in the 11s with heavier vehicles...a testament to the L36 bottom end...you can't believe everything you read!! In my opinion an L67 is not necessarily a better investment over an L36 when pound for pound the L36 will always have the advantage till maybe if you are compressing air over 2-bars...and still yet the advantage will lay due to your tuning window diminishing...

Got a Link to some pics of your setup?

[AllTheGoodNamesAreGone]

Nocutt,

here is my resoning..
1) I want reliability..
2) it will be easyer to tune with lower compression..
3) once its all done i will be running a $hitload more boost [img]smile.gif[/img]

I plan on going all out.. full overhaul.. not just internals, but a fully rebuilt motor, cam, heads, ect..

I have every intention of upgrading my blower, and running the motor up to atleast 7k..

intense has ALOT of nice parts these days.. and as soon as i land my new job money will not be too much of an issue.. [img]smile.gif[/img]

[BirdOfPrey01]

If you want reliability go with low compression forged pistons and steel connecting rods.

But if you plan on going over 450 horsepower, i cant gaurentee reliability.