3500 Headers

[Superdave]

i wish my collector outlets were 2.25"... i was actually considering changing them out to that and rebuilding my crossover pipe this winter but the 2" keps the velocity and might be helping out the bottom end torque a little (it's got plenty, lol)


Thanks for the compliments though

[zofo61]

Forced, IMO I think that you should try to get 6-10" of collector after the pipes merge so it will heilp build power. I have had many a cheap set of headers with only 4" or so after the point of merge in the collector and they were put to shame buy the Hooker street headers that I had with around 10" of collector length. With our smaller c.i. displacement we need to maximize our torque and hp through a true set of headers, not just a set of tubular exhaust manifolds. Super short collectors only help the highest rpm, where as much more power (torque and hp) can be gained in all rpms with more collector.
I know that this will bw difficult given the room available but it would be worth it. The rear header needs to have its own collecector just like the front and they should then have a y-pipe that has a larger outlet dia. for the tailpipe. Superdave has really got it right with his design, although they could use just a little longer collector, but thats just my opinion.

1 5/8 primarys, 24"-32" long (longer is better)
2.25" collector, 10" long
y-merge pipe with 2.5" outlet (people can make their own 3" if they need it)

Sounds perfect to me but once again thats just what I think. These headers would hekp everyones cars run better, even if thats the only mod that they could afford.
Anyones thoughts on this?

I am liking the way Johnny is talking.....just wondering if primaries that long will fit in the crosover concept most would use......especially the W body....not much room.

Hell even an affordable "KIT" would be awsome. It would give those with welding experience the chance to giddyup with less cash out? Force......have you and Ben thought of this as an option when the product goes to WOT-Tech?

[rsisbetter]

yes, i am currently starting to make headers, i've made the first flange (based on 3500 heads) stock port), and what pisses me off, is that 1.5'' tube is almost a bit too small, but 1-5/8'' is almost too much, engulfs the port hole. we need about 1-9/16'' . i'm leaning more towards the 1.5'' since it matches actually better to the port and easier than the 1-5/8''.

dave, i also wish they had 2.25'' collectors, i'l probably just have to get s&s to make some. 3-1 collectors are already hard enough to find, let alone in the right size.

[ForcedFirebird]

Stan's Headers made me a set of 2.25" to (3) 1 5/8" collectors. I think they were about 10" long. IIRC $18.

[rsisbetter]

^^ really?! thats a pretty good price. the other part about s&s, is the minimum order of 20 or 25 dollars, so then you end up ordering 3 collectors? i'll have to look into stan's

[bszopi]

There is always Schoenfeld as well. I've gotten some stuff from them before at reasonable prices. And its even nicer now, since they are only an hour or so from me.

http://www.schoenfeldheaders.com/product.htm

[johnnymossville]

i wish my collector outlets were 2.25"... i was actually considering changing them out to that and rebuilding my crossover pipe this winter but the 2" keps the velocity and might be helping out the bottom end torque a little (it's got plenty, lol)


Thanks for the compliments though

You're welcome Dave, those are a fine set of headers. I have been thinking about this and I believe all of that torque comes from the long length and proper size (1-5/8") of your primary pipes. Your data logs show that your hp and rpm are peaking a little low for that cam in my opinion. Have you considered the possibility that your upper range hp and rpm are being choked off by the exhaust system? It might be possible to pick up a few more hp and extend your rpm range by increasing the size and length of your collector and crossover pipe. Once again, these are my thoughts but it is something to consider.

[Superdave]

Last year i had 1 muffler restricting the flow.. this year it'll be Y'd to 2 Aerochambers for a total muffler flow of around 1000 CFM.

we'll see what happens very soon.. i hope to have it on the road in 2 weeks or so.

[johnnymossville]

Lucky You! I probably have 3-4 weeks till mine is running and its killing me!

[Barry]

I bought a new Lincoln MIG welder this winter.. i put a new exhaust on my truck with it, MUCH better than my HF welder.

Did the gas help alot with welding thin tubing like exhaust pipes? I did some exhaust welds with my flux-core, and it wasnet easy or fun.

I need to get a bottle, I already have the regulater and hookup...

[merlot566jka]

id say its easier and more fun. gas means les spatter and smoke. i weld exhaust for a living right now....

[Superdave]

Did the gas help alot with welding thin tubing like exhaust pipes? I did some exhaust welds with my flux-core, and it wasnet easy or fun.

I need to get a bottle, I already have the regulater and hookup...

i'm still running flux wire through it till i get a bottle, it's alot better with the new welder though..

i'll be putting my exhaust on the car tonight with it

[G-U-NOT]

Take lots of pics!!