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So I have a set of Gen 3 heads and I was given what I was told was the large port Gen 3 LIM. What I think I got was the 3400 LIM. I think I read somewhere that the 2000+ heads work with the 96+ 3400 and the 2000+ 3100. Am I correct?
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My CarDomain Site--------The Camaro Song -
From 00+ the 3100 heads and the 3400 heads were the same.sigpic
1994 Oldsmobile Cultass Supreme SL
3400/Getrag 284 5spd
1995 Chevy K1500 350c.i. 5spd Z71
350/NV3500 5spd
2014 Chevrolet Malibu LS -
I know from 2000+ they are the same, but I think the one I was given is older. The intake I was given looks like the one in the middle. Will this work with a set of Gen 3 heads?
My CarDomain Site--------The Camaro SongComment
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3400 (all years) is large port/whatever same as 2000+ 3100 intake and heads.
An older (pre 99) 3400 LIM will have a threaded fitting for the coolant pipe. Other than that they should be the same.
UIM will have different EGR mounting depending on year.sigpic
New 2010 project (click image)
1994 3100 BERETTA. 200,000+ miles
16.0 1/4 mile when stock. Now ???
Original L82 Longblock with LA1, LX9, LX5 parts
Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.
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The one in the middle is from a 3100 94-99. Small port. It can bolt up to the 3400/2000+ 3100 heads, but the flow is crap-tastic compared to the large port manifolds. It is a gen 3 manifold, but not a large port.
I'd hold off and find some large port lower and upper as the power is worth it. (btw you must use large UIM with a large LIM. Cant mix). If you cant tell by the port shape (small port is more round/oval, large port is like rectangle with rounded corners.) Count how many bolt holes are on the top for the UIM. The large port will only have 6 bolts for the upper to bolt on.
I bet someone on here could tell you what heads you have with the casting #'s probably. Also do the heads have roller fulcrum rockers?sigpic New 2010 project (click image)
1994 3100 BERETTA. 200,000+ miles
16.0 1/4 mile when stock. Now ???
Original L82 Longblock with LA1, LX9, LX5 parts
Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.
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Well its not a HUGE difference, but you cant port out the 3100 small port anywhere close to the stock openings of the 3400/largeport 3100 stuff. Im swapping off my 94 small port stuff for the larger ones
No, if you have roller rockers you dont have to worry about clearance problems.sigpic New 2010 project (click image)
1994 3100 BERETTA. 200,000+ miles
16.0 1/4 mile when stock. Now ???
Original L82 Longblock with LA1, LX9, LX5 parts
Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.
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