just some input please

[grandprixtomandjody]

i have a 89 2.8 and i want to drop it into my 90 gp no problem there but i just want to know like how big of a cam i can put in this motor and what can i do to the heads. I still want to drive this car everyday but i also want to have a "sleeper" engine can ne body stear me in the corrrect direction?

[slick]

I believe GM sells a cam, and I think its Crane cams that also has a cam too. I'd also upgrade the rockers. As for the heads, shave them, port and polish, and 3 or 5 angle valve job. I'd then put the 3.1 intake manifolds on the car, with a bigger TB.

[THe_DeTAiL3R]

Not much you can do to make a 2.8 a sleeper without spending an assload of money into custom work..

 

You can however swap the heads/intake/exhaust manifold from a 3x00 engine. But it would probably make more sense just to drop in a 3100 or 3400 in the first place....

[grandprixtomandjody]

well thank you for all the input and trying to set me straight

[stockgp]

exchange the crank for one from a 3.1. same motor, different crankshaft

[Guest TurboSedan]

nitrous! or you could bolt TGP parts onto the 2.8; it's the only easy way to add boost (relatively speaking of course).

[Justin]

I'd then put the 3.1 intake manifolds on the car, with a bigger TB.

 

Are the 3.1 intakes bigger than the 2.8s? I didn't think they were, and a 2.8 plenum would make it more of a sleeper than a 3.1 plenum.

[THe_DeTAiL3R]

the best mods for 2.8 would be to put in a 3.1 crank. I beleive the rest of the block (and motor) is pretty much the same.

 

To me if I had the money there would be 3 options: (add the crank to all of them)

 

Easiest:

 

3x00 top end swap. Bigger TB

 

Modest:

 

Make it into a turbo 2.8 (3.1 with the crank)

 

Hardest:

 

Turbo 2.8/3.1 with 3x00 top end swap (getting all the ports to match). I belive one guy on 60degreeV6.com has a Blazer or something along those lines with a 3100 (or 3.1 w/ 3100 top end) turbocharged that runs 13s.

[slick]

the best mods for 2.8 would be to put in a 3.1 crank. I beleive the rest of the block (and motor) is pretty much the same.

 

To me if I had the money there would be 3 options: (add the crank to all of them)

 

Easiest:

 

3x00 top end swap. Bigger TB

 

Modest:

 

Make it into a turbo 2.8 (3.1 with the crank)

 

Hardest:

 

Turbo 2.8/3.1 with 3x00 top end swap (getting all the ports to match). I belive one guy on 60degreeV6.com has a Blazer or something along those lines with a 3100 (or 3.1 w/ 3100 top end) turbocharged that runs 13s.

 

Why would you want a 3.1 crank in a 2.8 turbo motor. The 2.8 crank will rev much easier.....

[93CutlassSupreme]

the best mods for 2.8 would be to put in a 3.1 crank. I beleive the rest of the block (and motor) is pretty much the same.

 

To me if I had the money there would be 3 options: (add the crank to all of them)

 

Easiest:

 

3x00 top end swap. Bigger TB

 

Modest:

 

Make it into a turbo 2.8 (3.1 with the crank)

 

Hardest:

 

Turbo 2.8/3.1 with 3x00 top end swap (getting all the ports to match). I belive one guy on 60degreeV6.com has a Blazer or something along those lines with a 3100 (or 3.1 w/ 3100 top end) turbocharged that runs 13s.

 

Why would you want a 3.1 crank in a 2.8 turbo motor. The 2.8 crank will rev much easier.....

 

more displacement, more torque

 

more torque offsets the loss of rpm's.

 

drive a modern 4 cyl, and then drive a 350.

[Brian P]

...wow.

 

Put a 3.1 crank in a 2.8, do me a favor. Then start it up, slam the 2.8 pistons into the heads and junk the car and unsubscribe. Anyway:

 

The best cam for an otherwise stock 2.8 would be the crane H260/ the same as the one thru GM (and a little cheaper) or the crane compucam (2030) would work too but it's not much different than stock. If it were me, I'd buy the H260.

[excelsior]

do a tgp turbo project....theres alot of parts online though....ive seen people w/ 180-190 hp n/a.....make it tgp'd & ur ready to rock & roll!