Exhaust Manilods

daveycav90 · Posted: Tue Aug 19, 2008 6:03 pm Post subject: Exhaust Manilods

Just started my 3400 swap was just wondering what you guy think about running 3.1 exhaust manifolds on the 3400 heads

What would be the problems and the down fall

the reason i want to is so i wont have to have a custom down pipe made and save a little money

I know there are a few people that did this is the past

and the would the chip i have burned need to be changed

thanks

vetteracin · Posted: Tue Aug 19, 2008 6:05 pm Post subject:

the 3.1 manifolds would restrict the flow of the motor, the 3x00 log manifolds would be the best choice as they flow the best

z26guy · Posted: Tue Aug 19, 2008 7:08 pm Post subject:

Us the 3400 log manifolds those 3.1 manifolds are so going to restrict. but they should not effect your tune just hurt your full performance.

whitelightning2 · Posted: Tue Aug 19, 2008 9:39 pm Post subject:

I ran them without problems, the engine still performed very well. I used new gaskets for the 3.1 on them and had no leaks.

the 3400's log manifolds suck too, they aren't much better than the 3.1 manifolds,

daveycav90 · Posted: Tue Aug 19, 2008 9:47 pm Post subject:

so you are saying i could use the 3.1 manifolds with the 3.1 manifolds gaskets and not have to have a custom downpipe made just bolt up wiith the one i have now

whitelightning2 · Posted: Tue Aug 19, 2008 10:25 pm Post subject:

daveycav90 · Posted: Tue Aug 19, 2008 10:30 pm Post subject:

so do you recommend using the 3.1 gaskets or the 3400 gaskets

whitelightning2 · Posted: Tue Aug 19, 2008 10:39 pm Post subject:

daveycav90 · Posted: Tue Aug 19, 2008 10:44 pm Post subject:

ok sounds good
thanks a lot for all the help

rsisbetter · Posted: Thu Aug 21, 2008 4:25 pm Post subject:

whitelightning2 · Posted: Thu Aug 21, 2008 10:45 pm Post subject:

rsisbetter · Posted: Fri Aug 22, 2008 4:56 pm Post subject:

i thought i did a little big, but i went with 2.25" primaries, into a 3" y-collector, and then back down to 2.5" muffler after the merge.

whitelightning2 · Posted: Fri Aug 22, 2008 6:18 pm Post subject:

barry · Posted: Sun Aug 24, 2008 12:24 am Post subject:

Im going to do something a little different with my manifold setup. Im going to use my lx9 front mani, along with a newer style 3400 rear manifold in the back with the cross over port welded closed(cleanly of course). That way im only flowing half the ammount of air through it as usual, so it shouldnt be too bad.

Then a 2 inch y pipe with a flex in between, merged into 2.75 mandrel all the way out the back.

whitelightning2 · Posted: Sun Aug 24, 2008 10:55 am Post subject:

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