achieva V6 headers

[mjc79]

i'm planning on doing a motor swap/build later on down the road and i was wanting a set of headers for my 95 achieva. looked at alot of sites for parts but no one has any headers made. is there no one currently making any headers for this platform of car? or is it one of them "make your own custom type headers" deal lol?

thanks for the help,

mike

[bszopi]

You can get S&S Headers for a 99+ GA, but the rear header will have to be modified to fit your engine bay. Other than that, yes, its all custom.

[mjc79]

hey thanks man. would it really be worth it to upgrade to headers when i do my motor build or will the stock logs be efficent enough? the motor will probably be in the neighborhood of 275 flywheel hp.

[asylummotorsports]

I don't have any hard HP numbers, but the S&S headers on my 3500 are good for 3/10ths and 3 mph over the manifolds.

[IsaacHayes]

Headers are defiantly worthwhile. The logs are horrible. Headers on a stock 3400 have dynoed like ~20whp or something like that. So on a build engine yes they would be really beneficial. If you are serious about power N/A headers should be on your list. Or at the very least 3500 "shorty header" stock manifolds. 2 Front manifolds from that might work, then to a Y pipe. Those will flow better than logs but won't give you scavenging effects of headers.

[mjc79]

Or at the very least 3500 "shorty header" stock manifolds. 2 Front manifolds from that might work, then to a Y pipe.

i might end up going this route then. i've not had the car in the air to look at the bottom better to see exactly how the downpipe bends but to me from up top looks like headers might be a pain in the ass lol. i know i could make my own headers, its just i have no clue as to what size to make the primaries. would 1 5'8" be too much on mildly modded 3500?

heres a few pics of my exhaust clearance in the back.

[Superdave]

If i can fit longtubes in a 91 Cavalier.. you can do it in a 95 Olds.. lol


for the price factor though, i'd consider the 3500 manifolds. One of these days we'll finish the mockup on redbird's Sunbird and see how much better they are VS the stock 3400 manifolds. We have the manifolds and the flanges.. just need some U bends and a few hours.

[mjc79]

If i can fit longtubes in a 91 Cavalier.. you can do it in a 95 Olds.. lol


for the price factor though, i'd consider the 3500 manifolds. One of these days we'll finish the mockup on redbird's Sunbird and see how much better they are VS the stock 3400 manifolds. We have the manifolds and the flanges.. just need some U bends and a few hours.

yea a friend of mine is good at custom exhaust work lol. he pretty much welds up all my exhaust. might try to persuade him to do this for me when the time comes. if not i'll just go the stock manifold route.

if i do end up going with custom headers, what would be a good size for the primary tubes? im thinking 1 5/8" but it might be too big.

[Superdave]

yea a friend of mine is good at custom exhaust work lol. he pretty much welds up all my exhaust. might try to persuade him to do this for me when the time comes. if not i'll just go the stock manifold route.

if i do end up going with custom headers, what would be a good size for the primary tubes? im thinking 1 5/8" but it might be too big.

1 5/8" is a good size, that's what mine are and 32" length primaries.

1.5" would work as well but with the port size of a 3500 the larger diameter would do better.

[mjc79]

1 5/8" is a good size, that's what mine are and 32" length primaries.

1.5" would work as well but with the port size of a 3500 the larger diameter would do better.

cool deal. appreciate the help fellas, will come in handy when i try to tackle this project in february lol.

[LZeppelin513]

Or at the very least 3500 "shorty header" stock manifolds. 2 Front manifolds from that might work, then to a Y pipe.

how does this work? wont the outs be pointing opposite of each other?

[ForcedFirebird]

how does this work? wont the outs be pointing opposite of each other?

The 3500 manifolds are a lot different than the 3400's. One of the 3500 manifolds point straight out of the tubes, the other points down after the tubes (primaries).

[Superdave]

check out this thread... http://www.v6z24.com/jbodyforum/3500...manifolds.html

[1995 Gold Ciera]

Let us know how this works out. I have the same engine as you and would like to do the same thing down the road. This will be neat to follow.

Don't forget pics!