Vanning.com logo
Boxdin
Site Navigation


Advertisements
Recent Posts
Good day
by lukester - March 28th 2024 12:26 pm
Crazy mods
by MufflerMan Mike - March 28th 2024 9:38 am
Lew Greger
by MufflerMan Mike - March 27th 2024 5:15 pm
1987 G20 Gypsy
by SDMickey - March 25th 2024 9:39 pm
Featured Links


Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 2 1 2
Performance Exhaust Manifold suggestions, please
#544749 March 02nd 2012 11:03 pm
Joined: Feb 2012
Posts: 4
K
stranger
OP Offline
stranger
K
Joined: Feb 2012
Posts: 4
Hey all!

I have a 1995 G30 that is getting terrible gas mileage and poor performance too. So I've decided that I need to work on the exhaust. I figured that I would put in a dual-exhaust system. Since I hate headers and the constant maintenance requirements, I'd like to install some exhaust manifolds from a high performance engine. Maybe a Corvette or Z28. Glancing in the engine compartment of the G30 it looks like there's plenty of room for some center output manifolds like from a 91 Vette. Can anybody suggest some manifolds that might do a good job? Or know if I can get away with some Vette manifolds? I'm not looking for 400rwhp, but I'd sure like to get the performance from the gasoline that I'm burning.

Thanks,

-KP

Last edited by kpeters59; March 02nd 2012 11:05 pm.
Re: Performance Exhaust Manifold suggestions, please
kpeters59 #544769 March 02nd 2012 11:59 pm
Joined: Apr 2003
Posts: 7,662
Likes: 2
W
carpal tunnel
Offline
carpal tunnel
W
Joined: Apr 2003
Posts: 7,662
Likes: 2
Center dump exhaust manifolds will not fit a late model Chevy van.
The down and out the back stock minifolds on our vans are really not to very restrictive.
a worn out closed up cat can effect you gad milage.
depending on the emission laws in your state.it can be illegal to remove your cats.
a good flowing dual exaust might give you 1 to 2 more MPG....maybe.
Make sure your fuel pump is in good working order and change out the fuel filter if it has allot of miles on it (over 70,000)

I just changed out my G25's fuel pump filter and sender unit it made a noticeable difference how the van performs.
I average 16.5 MPG's
TBI 350 95,000 miles

.......Wookee


Its a "Van Thing"
A life style you have to LIVE to understand!

[Linked Image]

Vintage Chevy Van Club
Re: Performance Exhaust Manifold suggestions, please
wookee #544839 March 03rd 2012 10:17 am
Joined: Feb 2012
Posts: 4
K
stranger
OP Offline
stranger
K
Joined: Feb 2012
Posts: 4
16.5mpg! That would be a 50% increase! I can only dream...

That's great info. Thanks!

I was kinda planning on a dual exhaust/cat setup. But maybe that won't work with the ECM, because it doesn't currently have 4 o2 sensors? I could crawl under and look I suppose...

Thanks again.

-KP

Re: Performance Exhaust Manifold suggestions, please
kpeters59 #545578 March 05th 2012 6:03 pm
Joined: Oct 2001
Posts: 28,125
Madman!
Offline
Madman!
Joined: Oct 2001
Posts: 28,125
You can combat that header hatred! BTDT! You need to buy good headers (I recommend Hookers) and quality header gaskets (Felpro premium header gaskets or I think another good brand is remco) also when installing the header bolts, use stainless bolts with lock tight on each bolt and wait for it to dry before running, and you shouldn't have to touch them once installed.


Ken Schwarz
Tricky Truckers, N.J.
Van Clan Plus One, Canada
Manse Vans, Finland
Rebel Vanners, N.J. "USA"
Toopa Sinner Tribe, N.C.

www.showvans.com

http://www.cardomain.com/ride/360991

[Linked Image]

"Coolness ALWAYS trumps comfort"
Re: Performance Exhaust Manifold suggestions, please
kpeters59 #552702 March 30th 2012 6:32 pm
Joined: Feb 2005
Posts: 102
Likes: 1
member
Offline
member
Joined: Feb 2005
Posts: 102
Likes: 1
I'm gonna agree with Superbeast, if you get good headers and gaskets you won't have a problem.

I put a set of Doug Thorley headers in my '78 G10 about 12 years ago, they came with premium gaskets and I've never had a leak. Get the ceramic coating though, it makes good headers even better.

Re: Performance Exhaust Manifold suggestions, please
kpeters59 #552729 March 30th 2012 8:30 pm
Joined: Apr 2011
Posts: 2,182
R
veteran
Offline
veteran
R
Joined: Apr 2011
Posts: 2,182
First off, how many miles does this tank have on it and what kinda van is it? A fully loaded convesion or what? And block huggers will work.


[Linked Image][Linked Image]
Re: Performance Exhaust Manifold suggestions, please
River_Rat #555802 April 14th 2012 1:01 am
Joined: Feb 2001
Posts: 3,059
Likes: 3

LOST SOUL
Offline

LOST SOUL
Joined: Feb 2001
Posts: 3,059
Likes: 3
Originally Posted by River_Rat
And block huggers will work.


Center dump or rear dump block huggers? I would like to see a picture of them in place on a GM van. I tried using center dump block huggers on my 454 in my van and there's no way they would have worked.
I also agree with Ken. Get a good quality set of headers,gaskets and you won't have problems. Had a set of Doug Thorleys on my dad's 77 Suburban for almost 20 years and only had to replace one collector gasket. Brad

Last edited by Lordmodelbuilder; April 14th 2012 1:03 am.
Re: Performance Exhaust Manifold suggestions, please
River_Rat #555813 April 14th 2012 9:17 am
Joined: Apr 2003
Posts: 7,662
Likes: 2
W
carpal tunnel
Offline
carpal tunnel
W
Joined: Apr 2003
Posts: 7,662
Likes: 2
Originally Posted by River_Rat
First off, how many miles does this tank have on it and what kinda van is it? A fully loaded convesion or what? And block huggers will work.


BLOCK HUGGERS WILL NOT FIT a late model GM/GMC van.......

The header if you go that way need to be made for a van.Pick up headers are too wide,and hang down too low.
Yes you will need to put the O2 sensors back for the ECM to operate correctly.....
My 89 GMC only has one O2 sensor
A good quality header with a 3/8's thick mounting flange to the head is also better.
One problem with running long tube headers on a Chevy is they can over heat the starter.They also make the starter harder to drop.

.......Wookee


Its a "Van Thing"
A life style you have to LIVE to understand!

[Linked Image]

Vintage Chevy Van Club
Re: Performance Exhaust Manifold suggestions, please
kpeters59 #557091 April 19th 2012 10:10 pm
Joined: Jan 2003
Posts: 738
old hand
Offline
old hand
Joined: Jan 2003
Posts: 738
I've got a lead on a set of HOOKER headers model # 2459. The owner says they're for a Chevy Van/motorhome. Can anyone verify the part # ?


Keep Vanning Alive!!

Buddy LeSage

Certified Beer Geek
Truckers Unlimited
Host of the late,great PA Dutch Truck-Ins, '70's, '80s, '90s
Founder of the PennsylVANia Van Council
Host of SUMMERSET Truck-Ins '95 thru '07
Co-Chairman 24th National Truck-In, Lebanon, PA 1996
NATZ "Beer Bus" Captain 1999,2000,2005
Former Member of Performance, Inc. & Mill's Van Club
Keystone Madness '93 & '94
Mill's Van Club St. Patty's Day Party 1994-97

Initiated Mill's Van Club & Borderline Van Blessing 1999-2001
AS A NON PROFIT CHARITY FUNDRAISER

"...Enjoy every sandwich..." the late, great Warren Zevon
Page 1 of 2 1 2

Moderated by  Astro 

Link Copied to Clipboard
Donate


Upcoming Events
discovery
Who's Online Now
0 members (), 26 guests, and 3 robots.
Key: Admin, Global Mod, Mod
Newest Members
TheDrunkenGunsmith, Jac, LOVclassics, ZenMuffin, Milkman530
12724 Registered Users
Top Posters (30 Days)
SDMickey 129
CatFish 25
frscke1 25
Wedgy 21
Forum Statistics
Forums68
Topics35,746
Posts537,916
Members12,725
Most Online177
May 8th, 2013

Powered by UBB.threads™ PHP Forum Software 7.7.4