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Username Post: 92 350 SBC TBI - vortec heads        (Topic#177102)
The_Hunter 
Contributor
Posts: 984
The_Hunter
Loc: Manitoba, Canada
Reg: 02-14-05
12-14-07 07:11 AM - Post#1318293    

I'm on a quest for more mileage and power, am I on the right track here?

Currently my 350 is a bone stock 92 TBI engine, with the exception of the exhaust and tbi spacer.
Exhuast contains 3" dual pipe, dynomax ultraflows, and holley afterburner headers, 3" collector.

350 Vortec heads, any specific casting number you would suggest?
Intake. Will need something to match TBI unit to the vortec heads, does that exist?
TBI, Any gain to using the 454 unit? It flows at 670CFM instead of 550CFM (I think)
Felpro gaskets.
Cam swap, will need to match this combo.

I'm looking to make 275-300 HP at the flywheel.

Thanks
86 C10 Short Box

Computers are like air conditioners - They can't do their job properly if you open windows.


 
racecar100 
Contributor
Posts: 123

Reg: 09-04-07
12-14-07 08:29 AM - Post#1318334    
    In response to The_Hunter

You need this Comp HYD Roller for good power and mileage.
HYDRAULIC ROLLER-Optimized fuel mileage Hyd. Hyd. 800 to 5000 08-525-8 TPX246HR-16 246 258 194 206 .470 .464 116°

 
someotherguy 
Moderator
Posts: 25741
someotherguy
Age: 44
Loc: Texas
Reg: 08-01-03
12-14-07 09:03 AM - Post#1318361    
    In response to The_Hunter

  • The_Hunter Said:
I'm on a quest for more mileage and power, am I on the right track here?

Currently my 350 is a bone stock 92 TBI engine, with the exception of the exhaust and tbi spacer.
Exhuast contains 3" dual pipe, dynomax ultraflows, and holley afterburner headers, 3" collector.

350 Vortec heads, any specific casting number you would suggest?
Intake. Will need something to match TBI unit to the vortec heads, does that exist?
TBI, Any gain to using the 454 unit? It flows at 670CFM instead of 550CFM (I think)
Felpro gaskets.
Cam swap, will need to match this combo.

I'm looking to make 275-300 HP at the flywheel.

Thanks


GM Performance Parts makes an intake that lets you use a TBI on Vortec heads. Last I heard it was about $300. Often, people say Edelbrock makes one but last time I checked, they don't - people see the Performer that works on TBI engines and get confused.

The Vortec heads are a great upgrade over the TBI heads, but you'll almost surely need to do some custom chip tuning to have an engine that runs properly and gets the gains you're after, especially with any cam swap that differs significantly enough from stock to be worth the effort.

Richard
94 C2500LD / 97 Suburban LS1 / 06 300C SRT8
Check out my truck shop projects


 
The_Hunter 
Contributor
Posts: 984
The_Hunter
Loc: Manitoba, Canada
Reg: 02-14-05
12-14-07 10:25 AM - Post#1318439    
    In response to someotherguy

Looking around on the net, it seems that vortec casting #906 is the "good" heads.
86 C10 Short Box

Computers are like air conditioners - They can't do their job properly if you open windows.


 
Rick_L 
Honored Member
Posts: 25769

Loc: Katy, Tx, USA
Reg: 07-06-00
12-14-07 11:54 AM - Post#1318490    
    In response to The_Hunter

The 062 head is fine too. There was/is a myth going around about these being no good. The situation is that there were some 062 castings that were machined differently for HD trucks that are indeed no good because of the way they were machined (can't remember all the fine details). But this represented only a very small percentage (less than 1%) of all the Vortec heads produced for production trucks.

Maybe somebody remembers the details.

 
The_Hunter 
Contributor
Posts: 984
The_Hunter
Loc: Manitoba, Canada
Reg: 02-14-05
12-14-07 12:41 PM - Post#1318522    
    In response to Rick_L

http://www.gmpartsdirect.com/results.cfm?perfPacka...

Is that the manifold I need?
86 C10 Short Box

Computers are like air conditioners - They can't do their job properly if you open windows.


 
1983G20Van 
Super Senior Member
Posts: 3223

Loc: Bedford, Texas, USA
Reg: 11-13-02
12-14-07 06:48 PM - Post#1318744    
    In response to Rick_L

There is actually not a "BAD" vortec casting other than the 520s, which came on SOME of the earlier 305s. Even the 059s that came on the later 305s are good heads to have. The difference is not in the casting of the heads, it is in the angle of cut used on the exhaust seat of some of the HD 350 Vortecs (over 8,600 lbs GVW). The change in the angle was to allow for increased cooling of the exhaust valve by giving the valve more contact with the valve seat and giving greater cooling.

That being said, I have done the Vortec head TBI thing and it ran very well when done in conjunction with DIY Prom Burning.

GM made a factory TBI-Vortec intake with 2" bores, without EGR for use in Marine and Export applications. I had one at one point in time, but found even better performance with an edelbrock performer RPM Vortec intake manifold and a Marine TBI-Carb adapter.

If you were to switch to the 1993-1995 TBI PCM, there is even a factory GM 350 Vortec TBI calibration available as Memcal Broadcast Code BRDW.

GM BRDW CHEYENE 57 L V-8 Aut 1996 (pot) CHK:BC6E DELCO 2 Superchips BRDW CHEVRO~7POT 4103

GM BRDW CHEYENE 57 L V-8 Aut 1996 (pot) CHK:C8FF DELCO Superchips BRDW CHEVRO~3POT 4101

GM BRDW CHEYENE 57 L V-8 Aut 1996 (pot) CHK:B67D DELCO 2 Superchips BRDW CHEVRO~5POT 4102

GM BRDW CHEYENE 57 L V-8 Aut 1996 CHK:969B DELCO 27C512 16197427 BRDW CHEVR~82STD 4277















1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


Edited by 1983G20Van on 12-14-07 06:55 PM. Reason for edit: No reason given.

 
rusty82silverado 
Senior Member
Posts: 199

Reg: 03-20-05
12-15-07 07:26 AM - Post#1318968    
    In response to 1983G20Van

I hope your aware that drastically changing a TBI engine from stock means your gonna have to either re-tune the ECM yourself or have someone do it for you. Mail order chips are mostly crap.



 
The_Hunter 
Contributor
Posts: 984
The_Hunter
Loc: Manitoba, Canada
Reg: 02-14-05
12-15-07 10:01 AM - Post#1319036    
    In response to rusty82silverado

I am prepared to reprogram the ECM, that would be the "fun" part I think. (Once you know how to burn chips and have a good definition).

86 C10 Short Box

Computers are like air conditioners - They can't do their job properly if you open windows.


 
rusty82silverado 
Senior Member
Posts: 199

Reg: 03-20-05
12-15-07 10:11 AM - Post#1319043    
    In response to The_Hunter

Here is a good informative thread, it does not get much into the retuning aspect as he is paying to have someone else dyno tune it, but he builds a 383 TBI and you get to follow from start to finish.

http://www.thirdgen.org/techboard/tbi/420236- l05-3...

That forum is the best forum for the TBI I have come across, lots of good info. They have a whole section devoted to tuning the ECM's and PCM's, with info on converting from ECM to PCM and even adding a mass air flow sensor to a TBI, neat stuff.

A quick answer on your TBI/vortec intake question.... Yes GMPP and holley both offer vortech TBI intakes, you also could do a 4bbl intake with an adapter that most people do. From what I understand some very few vans and/or trucks came with vortech headed TBI engines in the mid 90's.

Edited by rusty82silverado on 12-15-07 10:15 AM. Reason for edit: No reason given.

 
1983G20Van 
Super Senior Member
Posts: 3223

Loc: Bedford, Texas, USA
Reg: 11-13-02
12-15-07 10:22 PM - Post#1319496    
    In response to rusty82silverado

  • rusty82silverado Said:
Here is a good informative thread, it does not get much into the retuning aspect as he is paying to have someone else dyno tune it, but he builds a 383 TBI and you get to follow from start to finish.

http://www.thirdgen.org/techboard/tbi/420236- l05-3...

That forum is the best forum for the TBI I have come across, lots of good info. They have a whole section devoted to tuning the ECM's and PCM's, with info on converting from ECM to PCM and even adding a mass air flow sensor to a TBI, neat stuff.

A quick answer on your TBI/vortec intake question.... Yes GMPP and holley both offer vortech TBI intakes, you also could do a 4bbl intake with an adapter that most people do. From what I understand some very few vans and/or trucks came with vortech headed TBI engines in the mid 90's.



TONS of MARINE 350 engines ran a TBI-Vortec head manifold with a 2" bore TBI unit as well. They turn up on the Ebay Marine section quite often.
1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


 
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