stroking 2.8 v6

[L0tuS]

does any one know if u can take the crank out of the 3.1 and put it into the 2.8?

[speedracer95v6]

Re: stroking 2.8 v6

I imagine it would work. Dunno if the 3.1 and 2.8 blocks are the same (RWD to FWD that is).

They have the same bore though. Might as well get a 3.4L though cause it wouldn't take much more and the 3.4L is a bored and stroked 2.8L that is RWD. You can pick up a long block for less than $100 at most salvage yards.

[L0tuS]

Re: stroking 2.8 v6

I imagine it would work. Dunno if the 3.1 and 2.8 blocks are the same (RWD to FWD that is).

They have the same bore though. Might as well get a 3.4L though cause it wouldn't take much more and the 3.4L is a bored and stroked 2.8L that is RWD. You can pick up a long block for less than $100 at most salvage yards.

3.1 came in the 91-92 fbodys so it is RWD and i dont think weather it was RWD or FWD it would make a diffrents in the crank. i just didnt know if like the journal size ws diffrent or anything

[96greenmachine]

Re: stroking 2.8 v6

i hope u didnt say that some birds were fwd lol, cuz there not any

[speedracer95v6]

Re: stroking 2.8 v6

D'oh! I was thinking 3100 engine.

[slpbirdy00]

Re: stroking 2.8 v6

D'oh! I was thinking 3100 engine.

haha :slap:

[L0tuS]

Re: stroking 2.8 v6

also what would be the right piston size for the 2.8 i was gonna buy some new ones but they have like 4 diffrent sizes and i dont know witch one is the right size and do they come stock with flat tops or the vavle cut out kind?

[camaroman1181]

Re: stroking 2.8 v6

from my understanding, the 2.8's (or at least some of them) had the smaller journal diameters. This tended to make them a bit weaker than the 3.1 and 3.4 cranks.

I am wondering, why are you looking to build a 2.8? a 3.4 would almost certainly fit where the 2.8 currently sits, and since they are all practically the same engine and have many interchangable parts, why not just use the 3.4? Hell, slap on some AL heads and intatke from a 3400 FWD engine, install the dished FWD pistons, and you are good to go.

[L0tuS]

Re: stroking 2.8 v6

I am wondering, why are you looking to build a 2.8?

just because its all ready sitting between the frame rails of my car and i dont really feel like spending a lot of money buying a v6 unless i was to come across a cheap 3.4 thats all ready out of the car then i would just slap that in

edit: did u say the front wheel drive 3400 have aluminum heads?? what model cars did thos motors coem in?

[3.4 slow to go]

Re: stroking 2.8 v6

if you're interested in the aluminum head swap, do a search on Russel, as he did this swap (along w/the matching intakes) on a 3.4. Also keep in mind, NONE of the 3100/3400/3500 intakes make provisions for a dizzy. Best bet would be to aquire a 3.4 block (already set up for DIS) and swap everything over.

Just slapping on aluminum heads & going is NOT the answer, and will only frustrate you until you do the full research.

The 82~84 2.8 had the smaller mains than the 85+'s did.

iirc, :

3.1 is a bored 2.8
3.4 is a bored & stroked 2.8
**** I claim the right to have the bore & stroke switched on the above if it turns out to be the case ****

[L0tuS]

Re: stroking 2.8 v6

wtf is "Dizzy" alway hear that word but dont know what it is. and the 2.8 is a 3.50 bore with 2.99 stroke the 3.1 is the same bore with 3.31 stoke and the 3.4 is a 3.62 bore with 3.31 stroke

[camaroman1181]

Re: stroking 2.8 v6

it wsa my understanding as well that the 3.1 is a stroked 2.8 and a 3.4 is a bored and stroked 2.8.

Yeah, i knew there was a small journal 2.8, but i wasnt exactly sure of what years.

a "dizzy" is a distributor. If you have one, and need one, that will need to be considered as the FWD heads and intake are all set up for the DIS systems.

oh, and if you are lookin for a 3.4.. i know where one is sitting.. but its in PA... are you anywhere close?

[camaroman1181]

Re: stroking 2.8 v6

oh, one more thing.. there is a sticky at the top of this forum that has a ton of info about our motors. take a look. its long, but theres a lot of info.

[black34v6]

Re: stroking 2.8 v6

if you're interested in the aluminum head swap, do a search on Russel, as he did this swap (along w/the matching intakes) on a 3.4.

:wavey:

Just slapping on aluminum heads & going is NOT the answer, and will only frustrate you until you do the full research.

looking up threads from my name, Russell, wont do you much good as i changed my name on this board to black34v6. do a search for "Black34v6" and you'll come up with much better results.

3.1 is a stroked 2.8
3.4 is a bored out 3.1

and actually, if you want to be technical about it -- the 3.4 block is actually slightly larger than either the 2.8 or the 3.1 - due to the increased bore. they wanted the block to be able to take some stress. so the 3.4 is actually a little stronger than either the 2.8 or 3.1