Has anyone made a Downpipe coming from stock 3400 Manifolds? If so - what flange did you use to mate with the manifold?
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I had this cut by a friend and it used the stock 3400 gasket, or a simple 2.5 flange gasket slightly modified to fit the bolt width.
I made this with it.
Used only one bend for my application and it came out perfect.
Got Lope?
3500 Build, Comp XFI Cam 218/230 .050 dur .570/.568 lift 113LSA
Fully Balanced, Ported, 3 Angle Valve Job, 65mm TCE TB, S&S Headers.
Stage-1 Raybestos/Alto 4t60e-HD, EP LSD, 3.69FDR
12.61@105 Epping NH Oct 2015 Nitrous 100shot (melted plugs) 13.58@98.8 N/A 3200LBS -
That looks familiar...
91 SS . 3400/5spd - S&S, TCE, EP, FFP, SPEC, DSS, K&N . GEARHEAD dezignComment
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That looks good. I am actually in need of someone to weld it up as well. This will actually be going into an Impala (W-Body) and I know the angles are much different than the N-Body. I will post up some pics of my Manifold and see what your opinion is.Comment
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When I made my downpipe for my car, I just used the stock flange that was on the stock downpipe, and welded 2.5" pipeto that flange. Works perfect.
sigpic
1994 Oldsmobile Cultass Supreme SL
3400/Getrag 284 5spd
1995 Chevy K1500 350c.i. 5spd Z71
350/NV3500 5spd
2014 Chevrolet Malibu LSComment
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Slightly separate topic - does anyone know if the 3900 Exhaust manifold will bolt up to a 3400 head? Based on the Part number searches, the 3500 and 3900 Exhaust manifolds are the same, at least for the 06+ Impala. If I remember correctly, the 3500's will bolt up, so this would suggest the 3900's would.Comment
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Two completely different 3500s. The ones in the 06+ Impala is the 3500VVT, which is just a smaller 3900. The 3500 manifolds that work on the 3400 is just a larger version of the 3400. So to answer your question, no, they won't work.
Brad via Tapatalk-Brad-
89 Mustang : Future 60V6 Power
Follow the build -> http://www.3x00swap.com/index.php?page=mustang-blogComment
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Damn... I'll stick with the ported 3400's then. TY for the info.Comment
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Anyone know a part number for the Exhaust Manifold Studs? I seem to be having difficulty find reliable information... couldn't think of a more reliable location than here.Comment
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Like the studs that go into the head? I got mine at Napa, PN 600-2604.-Brad-
89 Mustang : Future 60V6 Power
Follow the build -> http://www.3x00swap.com/index.php?page=mustang-blogComment
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Sweet i've always sourced flanges from the yard and cleaned them up but now ill get a brand new one made with the dimensions jon awesome postComment
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