grandprixtomandjody Posted September 27, 2004 Report Share Posted September 27, 2004 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? Quote Link to comment Share on other sites More sharing options...
slick Posted September 27, 2004 Report Share Posted September 27, 2004 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. Quote Link to comment Share on other sites More sharing options...
THe_DeTAiL3R Posted September 27, 2004 Report Share Posted September 27, 2004 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.... Quote Link to comment Share on other sites More sharing options...
grandprixtomandjody Posted September 28, 2004 Author Report Share Posted September 28, 2004 well thank you for all the input and trying to set me straight Quote Link to comment Share on other sites More sharing options...
stockgp Posted September 28, 2004 Report Share Posted September 28, 2004 exchange the crank for one from a 3.1. same motor, different crankshaft Quote Link to comment Share on other sites More sharing options...
Guest TurboSedan Posted September 28, 2004 Report Share Posted September 28, 2004 nitrous! or you could bolt TGP parts onto the 2.8; it's the only easy way to add boost (relatively speaking of course). Quote Link to comment Share on other sites More sharing options...
Justin Posted September 28, 2004 Report Share Posted September 28, 2004 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. Quote Link to comment Share on other sites More sharing options...
THe_DeTAiL3R Posted September 28, 2004 Report Share Posted September 28, 2004 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. Quote Link to comment Share on other sites More sharing options...
slick Posted September 28, 2004 Report Share Posted September 28, 2004 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..... Quote Link to comment Share on other sites More sharing options...
93CutlassSupreme Posted September 28, 2004 Report Share Posted September 28, 2004 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. Quote Link to comment Share on other sites More sharing options...
Brian P Posted September 28, 2004 Report Share Posted September 28, 2004 ...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. Quote Link to comment Share on other sites More sharing options...
excelsior Posted September 28, 2004 Report Share Posted September 28, 2004 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! Quote Link to comment Share on other sites More sharing options...
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