Vanning.com logo
Boxdin
Site Navigation


Advertisements
Recent Posts
DOOM VAN
by lukester - July 30th 2021 9:12 pm
any clubs in the bay area?
by Charlie99909 - July 30th 2021 8:17 pm
Crazy mods
by frscke1 - July 30th 2021 7:53 pm
Coronavirus
by Charlie99909 - July 30th 2021 7:19 pm
Some Junkyard Finds
by Charlie99909 - July 30th 2021 7:02 pm
Featured Links
Vanning.Com is a an authorized Amsoil Dealer


Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 2 1 2
Chevy TBI headers?
#777688 June 15th 2021 4:52 pm
Joined: Jun 2021
Posts: 6
Likes: 1
V
stranger
OP Offline
stranger
V
Joined: Jun 2021
Posts: 6
Likes: 1
Hello all,

I apologize if this has been covered in the past, I am a noob and could not find anything when I looked.

Can anyone out there help me identify a set of headers that will fit my van? Its a 93 chevy g10 with a TBI 305 in it.

Anyone out there have headers on their g10, g20 or g30 with a TBI motor in it?

Thanks in advance

Re: Chevy TBI headers?
Van_Islander #777751 June 16th 2021 3:04 pm
Joined: Mar 2019
Posts: 122
Likes: 2
J
member
Offline
member
J
Joined: Mar 2019
Posts: 122
Likes: 2
I have headmans on my 88 g20 with a 305 tbi. #69060 They don't offer provisions for air injection on that set.

Re: Chevy TBI headers?
Van_Islander #777775 June 17th 2021 12:29 pm
Joined: Apr 2021
Posts: 114
Likes: 8
P
member
Offline
member
P
Joined: Apr 2021
Posts: 114
Likes: 8
Chances are headers for squarebody or OBS pickup will fit. I know that vans could have both the nearly straight down dump manifolds that most trucks had, or I had a '95 that had the angled ones like 90s OBS pickups had. As long as the headers don't stick out to the side much further than stock manifolds there's plenty of room for the rest.


1994 G20
2002 Express, sitting dead
1988 G20 conversion, stored
Re: Chevy TBI headers?
Van_Islander #777776 June 17th 2021 12:53 pm
Joined: Sep 2005
Posts: 9,204
Likes: 34
carpal tunnel
Offline
carpal tunnel
Joined: Sep 2005
Posts: 9,204
Likes: 34
Originally Posted by Van_Islander
Hello all,

I apologize if this has been covered in the past, I am a noob and could not find anything when I looked.

Can anyone out there help me identify a set of headers that will fit my van? Its a 93 chevy g10 with a TBI 305 in it.

Anyone out there have headers on their g10, g20 or g30 with a TBI motor in it?

Thanks in advance

Note: If you're installing headers on a TBI engine be sure you have the 3-wire (heated) O2 sensor. If you have the one wire sensor it will NOT get hot enough with headers to supply info to the ECM. Without input the ECM can not calculate air/fuel ratio and will default to preset programming and you will run lean(er). Your van may be three wire already but if not the three wire is very simple to retro fit from almost any "ignition on" (+) source and a ground (-).
Also it's very important to check your fuel pressure! You'll need at least 13 to 14 psi for the injectors to supply fuel/operate as needed with the headers. A new pressure regulator spring or adjustable regulator may/may not be required. The factory sets between 10 and 12 psi. Even 1 psi makes a huge difference in fuel delivery.
Just My2%

Last edited by CatFish; June 17th 2021 1:02 pm.
Re: Chevy TBI headers?
CatFish #778001 June 21st 2021 3:21 pm
Joined: Jun 2021
Posts: 6
Likes: 1
V
stranger
OP Offline
stranger
V
Joined: Jun 2021
Posts: 6
Likes: 1
Hey CatFish,

I already retro fit a 3 wire O2, so I am covered there. Interesting point about the fuel pressure.. I have an entirely new fuel system from the pump to the throttle body and am currently getting perfect fuel pressure at factory spec. The addition of headers requires a higher PSI?

Re: Chevy TBI headers?
Juntao_DW #778002 June 21st 2021 3:25 pm
Joined: Jun 2021
Posts: 6
Likes: 1
V
stranger
OP Offline
stranger
V
Joined: Jun 2021
Posts: 6
Likes: 1
Hey Juntao_DW

These are the ones I was looking at, I suppose if they fit your 88 there is no reason to believe they wont fit my 93. Thanks for the reply!

Re: Chevy TBI headers?
Van_Islander #778006 June 21st 2021 5:02 pm
Joined: Sep 2005
Posts: 9,204
Likes: 34
carpal tunnel
Offline
carpal tunnel
Joined: Sep 2005
Posts: 9,204
Likes: 34
Originally Posted by Van_Islander
Hey CatFish,

I already retro fit a 3 wire O2, so I am covered there. Interesting point about the fuel pressure.. I have an entirely new fuel system from the pump to the throttle body and am currently getting perfect fuel pressure at factory spec. The addition of headers requires a higher PSI?

With headers, maybe so.

Good reading here: http://marine-performance-parts.com/gm-tbi-tuning-tips-htm.aspx

Last edited by CatFish; June 21st 2021 5:03 pm.
Re: Chevy TBI headers?
CatFish #778045 June 22nd 2021 1:24 pm
Joined: Jun 2021
Posts: 6
Likes: 1
V
stranger
OP Offline
stranger
V
Joined: Jun 2021
Posts: 6
Likes: 1
Awesome, that's good stuff thanks for the link!

Re: Chevy TBI headers?
Van_Islander #778052 June 22nd 2021 6:45 pm
Joined: Nov 2013
Posts: 1,568
Likes: 8
W
veteran
Offline
veteran
W
Joined: Nov 2013
Posts: 1,568
Likes: 8
http://marine-performance-parts.com/cfmtechportedthrottlebodyforgmtbi74l.aspx

Awesome link Catfish! Excellent prices on the fuel pressure gauges and adapter. Exactly what I need to troubleshoot the B250 TBI fuel issues.

I wonder if one of these HiPo 454 Thottle Body's would screw up frscke1's smog numbers? So glad I don't have to deal with that. Some inexpensive Mustang insurance. grinYou just never know.

Definetely will be installing the CFM 109 ported carb spacer underneath the Rochester 2BBL on my 4.3 OMC

I have had both headers on a 327 2bbl in a 70 C10, and true duals with stock cast iron manifolds in a 97 Sierra 1500 EFI 350, both with no X pipe. No smog on the carbed 327, 160 thermostat. 97 EFI smallblock, 195 thermostat. Both GM Trucks, but the C10 Shorty with the 327/4sp was very different than the Sierra. Both were way too loud. One thing to consider in a Van 4 sure.

If cost was no object, I'd still keep the cast iron manifolds on all my vans. run true duals with an X pipe to one side in back, quiet mufflers, Seen a few red hot Mopar, n, 454 MH motors with glowing headers, and I just think iron manifolds run cooler. What I want under the Doghouse is as cool as possible.


"Who New? Blue"
1990 Chevy G30 454
Church Van, maternity division

"Old Blue"
1988 Dodge B250

"Cabin Cruiser"
'94 Dodge B350 www.xplorermotorhome.com/
Xplorer MH model 230 230 hp MPI 360 LA Wedgy OD auto

Old vans never really die if we chose to let them live
Re: Chevy TBI headers?
Van_Islander #778053 June 22nd 2021 7:17 pm
Joined: Jun 2010
Posts: 15,820
Likes: 64
Offline
Joined: Jun 2010
Posts: 15,820
Likes: 64
Tang Ins ? we dont need no stinking Tang Ins .... LOL ! !


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Page 1 of 2 1 2

Moderated by  Astro 

Link Copied to Clipboard
Donate


discovery
Who's Online Now
0 members (), 4 guests, and 1 robot.
Key: Admin, Global Mod, Mod
Newest Members
mopure, wldmn65, jac962, FLATSHEILD, ATH84
12015 Registered Users
Top Posters (30 Days)
SDMickey 188
frscke1 95
kursed 83
NEmery 42
CatFish 36
Forum Statistics
Forums68
Topics38,339
Posts542,721
Members12,016
Most Online177
May 8th, 2013

Powered by UBB.threads™ PHP Forum Software 7.7.4