Tta vs Gn motor

[GN GURU]

Gonna drop a motor out of a Gn into a tta i kno I gotta swap heads & headers is the all? Thx guys

 

[jarredsoon]

I think that's all

 

[t-typinator]

.

 

[1fastcobra]

Down pipe
That's it
But why change the heads
It will bolt right in
Just have to fab the a/c box.

Posted from the TurboBuick.Com mobile app

 

[GN GURU]

Down pipe
That's it
But why change the heads
It will bolt right in
Just have to fab the a/c box.

Posted from the TurboBuick.Com mobile app

Yeah thx I have the heads & down pipe with the headers I'll get on it this week end

 

[TT/Ameasap]

As stated, A/c gotta be sectioned or removed all together to fit the GN heads.
Are the heads ported?

 

[GN GURU]

As stated, A/c gotta be sectioned or removed all together to fit the GN heads.
Are the heads ported?

 

[GN GURU]

As stated, A/c gotta be sectioned or removed all together to fit the GN heads.
Are the heads ported?

I have a few set of tta heads & headers & down pipe

 

[TT/Ameasap]

I guess what Im getting at is, if the GN heads have a good porting and good enough tune, its gonna fly.

 

[GN GURU]

I guess what Im getting at is, if the GN heads have a good porting and good enough tune, its gonna fly.

No it's stock block but do u kno who can port the tta heads? Ur in pa no?

 

[turbo89]

Gonna drop a motor out of a Gn into a tta i kno I gotta swap heads & headers is the all? Thx guys

If your running it on pump fuel you will have to keep the boost DOWN as it will knock.. compression will be higher

 

[TT/Ameasap]

I'm in IL.
As far as porting. Depends on how fast you want to go.

 

[Jan Larsson]

Piston's (size) are different as used in the TTA to maintain the 8:1 compression ratio like the GN (so dish is .040 deeper compared to the GN pistons otherwise the same).

 

[krom]

I am starting to look for some heads , do not care if they have correct numbers. Any one have the different models of cars they came on so I can go junking? They will be put on my spare built motor that ran mid 10's in my Limited.

 

[etriebe]

I believe heads from 86-88 century or cutlass ciera with a 3.8 have the same casting number as the tta and are center bolt valve covers

 

[TT/Ameasap]

Theres a vender on Ebay that sells the NOS heads for the Centuries. I bought a set a while back from him. I think I paid around 100 bucks.

 

[ttaowner]

what would the compression be with tta heads on a 86-87 gn short block? same question on the 84-85 gn short block i know there are custom head bolts needed for this

 

[turbows6]

It's about 9:1

I know if you use diamond GN pistons and a .039 head-gasket you are at 9.1 to 1.

 

[turbo89]

I am starting to look for some heads , do not care if they have correct numbers. Any one have the different models of cars they came on so I can go junking? They will be put on my spare built motor that ran mid 10's in my Limited.

TTA heads are just that.. TTA specific 702 casting .. the plug / chambers are different on the TTA heads

515 castings are the FWD, so are the 248's

 

[TTA308]

TTA heads are just that.. TTA specific 702 casting .. the plug / chambers are different on the TTA heads

515 castings are the FWD, so are the 248's

Where are the numbers at ? Resurrecting a old thread as i have a GN block (pistons, crank rods etc ) with real TTA heads...