Replace LB9 305 w/ 350, keep TPI - Third Generation F-Body Message Boards


TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
Sponsored by:
Sponsored by:

Replace LB9 305 w/ 350, keep TPI

Reply
 
Thread Tools Search this Thread
Old 12-05-2017, 05:15 PM   #1
Junior Member
Thread Starter
 
gtoger's Avatar
 
Join Date: Jun 2017
Posts: 13

Replace LB9 305 w/ 350, keep TPI

Looks like I've blown a head gasket on the 1986 Trans Am. Low oil pressure, weak power, and brown foamy coolant.

So thinking about the options... maybe I could use the opportunity to find a decent 350 SBC - even a crate motor - and toss the TPI system right on top of it. Is that way too simple?

I've already been thinking about the LS swap but then it's ECU this, throttle that, transmission another thing. Thinking about what would be a bit of an upgrade for not a lot of money or hassle. Pull accessories, pull engine, put new engine in, attach accessories, drive. That sort of thing.

Thoughts?
gtoger is offline   Reply With Quote
Old 12-05-2017, 05:35 PM   #2
Sponsor
iTrader: (77)
 
Tuned Performance's Avatar
 
Join Date: Dec 2004
Location: Mile High Country !!!
Posts: 8,931
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt


Re: Replace LB9 305 w/ 350, keep TPI

You will need to get 22#hr injectors. As well as have your computers chip (memcal) reprogrammed.
Depending on the year of the Crete motor you might need to elongate the center four intake holes.
Tuned Performance is offline   Reply With Quote
Old 12-05-2017, 05:43 PM   #3
Junior Member
Thread Starter
 
gtoger's Avatar
 
Join Date: Jun 2017
Posts: 13

Re: Replace LB9 305 w/ 350, keep TPI

Thanks, Tuned Performance. Injectors shouldn't be a big problem. Not really sure who's doing programming on these old ECUs these days. On the intake holes having to be elongated, you mean drill them deeper? Not use shorter bolts?
gtoger is offline   Reply With Quote
Old 12-05-2017, 06:01 PM   #4
Sponsor
iTrader: (77)
 
Tuned Performance's Avatar
 
Join Date: Dec 2004
Location: Mile High Country !!!
Posts: 8,931
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt


Re: Replace LB9 305 w/ 350, keep TPI

The bolt pattern on the center four holes are different angles 72 and 90.


If you need programming assistance you can send me a pm.
Tuned Performance is offline   Reply With Quote
Old 12-05-2017, 06:04 PM   #5
Junior Member
Thread Starter
 
gtoger's Avatar
 
Join Date: Jun 2017
Posts: 13

Re: Replace LB9 305 w/ 350, keep TPI

OH! I see. OK, thanks. Can you tell me what angle the LB9 is (or where I should find that) so I can use that when I'm shopping? If I go that route, I'll let you know on the ECM for sure.
gtoger is offline   Reply With Quote
Old 12-05-2017, 06:26 PM   #6
Sponsor
iTrader: (77)
 
Tuned Performance's Avatar
 
Join Date: Dec 2004
Location: Mile High Country !!!
Posts: 8,931
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt


Re: Replace LB9 305 w/ 350, keep TPI

I can recall what year 86 is . It might be 90degrees and in 87 was 72 I think.
Tuned Performance is offline   Reply With Quote
Old 12-05-2017, 09:25 PM   #7
Supreme Member
 
Join Date: Jan 2003
Posts: 2,061


Re: Replace LB9 305 w/ 350, keep TPI

Pretty sure the transition occurred in 87.
ULTM8Z is offline   Reply With Quote
Old 12-05-2017, 10:45 PM   #8
Junior Member
Thread Starter
 
gtoger's Avatar
 
Join Date: Jun 2017
Posts: 13

Re: Replace LB9 305 w/ 350, keep TPI

Looks like I can always get the intake manifold for bolting TPI to Vortec heads. And wiring harness should stay intact, right? If I'm keeping all the accessories. I think I would have more problems putting L98 into the LB9 car because the harnesses are backwards to each other in places.
gtoger is offline   Reply With Quote
Old 12-06-2017, 08:48 AM   #9
Supreme Member
 
Join Date: Jan 2003
Posts: 2,061


Re: Replace LB9 305 w/ 350, keep TPI

If you get the Vortec TPI manifold, you have to use Vortec heads. They're not interchangeable with previous years.
ULTM8Z is offline   Reply With Quote
Old 12-06-2017, 08:59 AM   #10
Junior Member
Thread Starter
 
gtoger's Avatar
 
Join Date: Jun 2017
Posts: 13

Re: Replace LB9 305 w/ 350, keep TPI

Thanks ULTM8Z. I got that. My line of thinking is that since a lot of the crate options (long blocks) are coming with the Vortec heads. So if I want to put the TPI on the new engine, I'll need that intake from Scoggin-Dickey that the factory plenum should bolt right onto.
https://sdparts.com/i-23896057-sdpc-...baseplate.html
gtoger is offline   Reply With Quote
Old 12-06-2017, 09:05 AM   #11
jmd
Supreme Member
iTrader: (4)
 
Join Date: Jul 2000
Location: Aridzona
Posts: 5,824
Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R


Re: Replace LB9 305 w/ 350, keep TPI

Drive a stock LS1 F-body.
Drive a stock L98 F-body.
Proceed as you see fit.
jmd is offline   Reply With Quote
Old 12-06-2017, 11:19 AM   #12
Senior Member
 
Join Date: Mar 2017
Posts: 992

Re: Replace LB9 305 w/ 350, keep TPI

Quote:
Originally Posted by jmd View Post
Drive a stock LS1 F-body.
Drive a stock L98 F-body.
Proceed as you see fit.
But a Vortec crate motor will not be a stock L98. Also still a LOT more expensive to do an LS swap - more expensive crate engine and modifications required to do so.

Not that it isn't a good idea, but it will cost more. And a built Vortec crate engine will make similar power to a stock LS1.

GD
GeneralDisorder is offline   Reply With Quote
Reply


Go Back   Third Generation F-Body Message Boards >

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Advertising
Featured Sponsors
Vendor Directory

1982 Camaro '82 || 1983 Camaro '83 || 1984 Camaro '84 || 1985 Camaro '85 || 1986 Camaro '86 || 1987 Camaro '87 || 1988 Camaro '88 || 1989 Camaro '89 || 1990 Camaro '90 || 1991 Camaro '91 || 1992 Camaro '92


All times are GMT -5. The time now is 09:22 PM.


All content copyright 1997 - 2014 ThirdGen.org. All rights reserved. No part of this website may be reproduced without the expressed, documented, and written consent of ThirdGen.org's Administrators. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: