Question on the 3.1
Thread Starter
Junior Member
Joined: Jun 2001
Posts: 37
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From: oswego New York
Question on the 3.1
Iam trying to figure out a few things for my buildup. Now is the 3.1 and 2.8 are the same motor but the 3.1 has a biger crank in it????? if so is ti a 3.4 crank. also will parts for a 2.8 or a 3.4 fit right in a 3.1 iw as told by some **** at paw that the aluminum heads for a 2.8 wont fit but i think he was smocking crack.
Thanx in advance
Thanx in advance
Supreme Member
Joined: Mar 2000
Posts: 1,777
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From: First one out of liberty city, burn it to the ground
who told u that at PAW? i used to work there so i can go and smack him upside the head. The 2.8, 3.1, 3.4 all have the same block, 3.4 and 3.1 are bored and stroked...
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1989 Firebird
2.8 v6, t5 swapped in
Performance Mods:
Ram Hi-po clutch, Cold Air, 1.6 rockers,Lakewood LCA's, Lakewood Lift bars, Wonder Bar, 3" y-pipe, Random Tech Cat, 3" I-pipe, Flowmasters, MSd 6a, MSD Coil, Accel 8.8 wires, Auto Meter Gauges (Water, Clock, Fuel Pressure, and 5" Sport Comp Tach)TB Bypass, 4th Gen Seats
Car Stereo:
Blaupunkt head, Monster Cable wiring, MTX Thunder 6000 12" inverted in a personally made box with a 350*1 Amp pushing it, MTX 6x9 in the back with hopes for components in front
Coming for my v6:
Panhard Bar, 4thgen front seats, Nitrous, Line Lock, Posi, Spohn Torque Arm & Subframe connnectors
"I'd rather run last in a full out race, than to NOT have run at all"
#3 Forever
My Site:
Click Here to see my car!
------------------
1989 Firebird
2.8 v6, t5 swapped in
Performance Mods:
Ram Hi-po clutch, Cold Air, 1.6 rockers,Lakewood LCA's, Lakewood Lift bars, Wonder Bar, 3" y-pipe, Random Tech Cat, 3" I-pipe, Flowmasters, MSd 6a, MSD Coil, Accel 8.8 wires, Auto Meter Gauges (Water, Clock, Fuel Pressure, and 5" Sport Comp Tach)TB Bypass, 4th Gen Seats
Car Stereo:
Blaupunkt head, Monster Cable wiring, MTX Thunder 6000 12" inverted in a personally made box with a 350*1 Amp pushing it, MTX 6x9 in the back with hopes for components in front
Coming for my v6:
Panhard Bar, 4thgen front seats, Nitrous, Line Lock, Posi, Spohn Torque Arm & Subframe connnectors
"I'd rather run last in a full out race, than to NOT have run at all"
#3 Forever
My Site:
Click Here to see my car!
Thread Starter
Junior Member
Joined: Jun 2001
Posts: 37
Likes: 0
From: oswego New York
thanx for the info,,
does anyone have the bore size and other number for the 3.1
also if it is stroked what sizr crank is it, kinda lost on that part a 400 with a 350 crank is a 383 but with a v6 iam confused.
thanx again in advance
does anyone have the bore size and other number for the 3.1
also if it is stroked what sizr crank is it, kinda lost on that part a 400 with a 350 crank is a 383 but with a v6 iam confused.
thanx again in advance
Supreme Member
Joined: Jan 2001
Posts: 7,604
Likes: 1
From: ****SoCal, USA****
Graeme, you cannot bore out a 3.1 to make a 3.4.
We finally figured that detail out. I can pull up the specs from the GM books, too.
The 3.4 block is meatier and the internals are different. Using 3.1 internals does not make a stroked 3.4. You can get that "kit", but, why pay for that when you buy the correct 3.4 engine and have more room for the rebuild one day.
The heads, yes are same (as are the valves), but the springs and the retainers are different.
WHY ARE THE ALUMINUM HEADS DIFFERENT?
The valves for the alum. are splayed, like a Chevy Big Block.
Our iron heads valves are side by side.
Thus they FIT, but will not interchange intake systems.
It wasn't our decision to be stuck with the cast iron heavy heads! I'd like the alum. heads, myself, too. I had a pair for free, I tossed them back to the pile of heads.
https://www.thirdgen.org/messgboard/...ML/001462.html
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Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA
We finally figured that detail out. I can pull up the specs from the GM books, too.
The 3.4 block is meatier and the internals are different. Using 3.1 internals does not make a stroked 3.4. You can get that "kit", but, why pay for that when you buy the correct 3.4 engine and have more room for the rebuild one day.
The heads, yes are same (as are the valves), but the springs and the retainers are different.
WHY ARE THE ALUMINUM HEADS DIFFERENT?
The valves for the alum. are splayed, like a Chevy Big Block.
Our iron heads valves are side by side.
Thus they FIT, but will not interchange intake systems.
It wasn't our decision to be stuck with the cast iron heavy heads! I'd like the alum. heads, myself, too. I had a pair for free, I tossed them back to the pile of heads.
https://www.thirdgen.org/messgboard/...ML/001462.html
------------------
Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA
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