Hummer exhaust headers

[Dvldog 8793]

Howdy
Anyone know if hummer headers are any better than stock? At least they look like the outlet is larger. Also they are steel so I could weld on whatever size outlet I wanted.
Any thoughts/ideas?
Also any info on using a hummer single plane intake? I will be converting from an EGR motor.
Thanks in advance!
L8r
Conley Janssen
USMC 87-93

[yeti]

Aren't the bolt patterns different from the Hummer headers to a 6.2l?

What year hummer?

[Dvldog 8793]

This would be '86 hummer surplus headers from a 6.2, I would be putting them on my '84 6.2 van. Mainly for the ability to wled on larger outlet flanges. If the bolt patern isdeffernt then I would be better off making my own set of headers.

[dieselcrawler]

I thought that all 6.2L heads were the same, so I would think that the hummer headders would bolt on the same as the stock 6.2L exaust manifolds would... but then, I don't know every thing...

Greg

[Peter J. Bierman]

Boltpatterns are the same for all 6.2 and 6.5 engines, so they should fit.
A Hummer intake will fit the heads but they are lower and the two bolts for fitting the filterbox are 90 deg. rotated.
The intake is less restrictive but you have to convert your filter housing or fabricate a spacer.

Peter

[Dvldog 8793]

Thanks Peter/ALL!
L8r
Conley Janssen

[gavio]

I've never tried it myself, but as I understand it, the issue with hummer headers is that they don't fit inside the frame rails on a pickup. The humer headers spread out to the sides more than the stock exhaust manifolds. I believe that I once saw a set for sale that had been modified to fit, so I expect it can be done.

Now my experience with my van is that everything is a fair bit tighter than a pickup, so whether they can be cut and rewelded in such a way as to fit in THAT space, I haven't heard. I'd be interested to know if it works, though.

Good luck!

[john8662]

The Hummer intake won't work for your configuration. I think it would be best to convert to a dual plane J intake for your year 6.2, that way it'll be a bolt on deal. I've done it once on an 83 3/4 6.2 conversion van. I wouldn't think that you'd exactly want to tinker with adapting anything in a van configuration, its not exactly roomy, but junking the C intake for the J intake, will gain you some power, and less smoke out the tailpipes.

[Dvldog 8793]

John-
Why wont the intake work? Is it a fitment problem? I've already fabricated a different air/ram air filter system, so as far the air cleaner housing ect is concerned, no problem.
Thanks again!

[john8662]

What aircleaner are you using?

1. If you're using the factory air cleaner on it, it won't work well, as the hummer intake air cleaner fastener positions are different. The intake will physically mount to your engine, but as mentioned the air cleaner mounting studs will be rotated, right now, they are inline with the engine

2. The hummer intake is shorter, lower profile intake, doesn't come up as high as the other intake did. This also poses problems with the factory air cleaner housing, its positioned higher to clear the A/C compressor.

3. You will need a place to mount your fuel filter housing that resides on the back side of the intake. You'll have to compare intakes to make sure the bolt holes are positioned for your type of fuel filter mounting.

I did the conversion from a C intake on my Fathers 83 6.2 van. I just used an 82/83 J series intake manifold, because it had threaded holes on the back of the intake facing horizontally. The later model 6.2's in G-vans used the newer fuel filter housing, which had bolt holes facing vertically from the top of the intake to mount the fuel filter bracket to the intake. I think 84+ had the newer (I forget the Model number fuel system) fuel filter/water seperator setup on it.

My Fathers 83 had both fuel filters, a primary and secondary fuel filter. The primary filter (big round, size of oil filter) was mounted underneath the van, nearest to the fuel tank, it was for water separation. The next filter mounted on the back of the intake and it was a smaller square filter, for fine fuel filtration going into the injection pump.

I would also be concerned with making sure the Hummer intake risers (where the bolts mount to the head) were the same height, as you'll have brackets for the A/C that depend on them being the right height.

In conclusion, it could work with a Hummer intake, but with some adapting. I just wanted to use and intake that eliminated the EGR and fit just like factory. It did work well on this van, looks stock, and has a little more power, and definitly less black smoke.

Also, I'd be interested in seeing what your new air cleaner/Ram air intake setup looks like, I might consider doing something similar, Do you have any pics?

[Dvldog 8793]

Howdy
I will take some pics before I put the van away for the winter. Ram air is pretty much a modification/combination of a gasser/diesel system. I would like to mount the fuel filter remote from the intake as my seats do not allow me to remove the dog house w/out taking out pass seat. BIG PAIN! Fabrication of any parts is not a problem as I have a full machine/welding shop. My van runs great but leaks oil BAD and I'm thinking that I will do some mor mods when I fix the front and rear seals.
Email me direct and I will try to get some pics/ specs of my ram air systme this weekend.
Thanks !
L8r
Conley
the_janssens@earthlink.net