09-17-2010, 05:04 AM | #1 | |
Conversion Truck Addicted
Join Date: Sep 2009
Location: Denmark, Europe
Posts: 1,551
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TBI 87 350 to 454
Im going to build a 454 with tbi for my heavy hauler project. but can i take a throttle body, wiring harness and ECM from a 350 truck?
Thanks Thomas
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Thomas Quote:
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09-17-2010, 07:25 AM | #2 |
Registered User
Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
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Re: TBI 87 350 to 454
Harness is fine, ECM will need a reflash.
The throttle body will be too restrictive, your 454 will be breathing through a straw. Find a good rebuildable 454 throttle body and go from there. |
09-17-2010, 08:21 AM | #3 |
Formerly- 1972SuperCheyenne
Join Date: Oct 2008
Location: Wake Forest NC
Posts: 5,782
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Re: TBI 87 350 to 454
I agree. The 5.7 TBI will kill that 7.4
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--Josh My Build Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=799218 A good crossthread is better than Loctite any day. Life is not about what you have, but who you have to share it with. |
09-17-2010, 09:24 AM | #4 |
BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: TBI 87 350 to 454
Call this company to upgrade your TBI.
http://cfm-tech.com/GM_tbi_tuning_tips.htm |
09-18-2010, 02:48 PM | #5 | |
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Join Date: Oct 2003
Location: OC CA
Posts: 1,374
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Re: TBI 87 350 to 454
Quote:
Alternately BBC IAC uses GM#12126487; AC-Delco #PT757 or Pico-5602 pigtail. The 1227747 ECM uses 2732A UV PROM chip (which is not the same as FLASH) - which is notoriously prone to failure! The easiest way to get around this 25+ year old chip is to install modern Flash chip AT29C256 or 27SF512 in G2 adapter. For detailed information see http://www.moates.net //RF
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"The Beast" 1975 Chevrolet C20 longbed 350/700R4! with 3inch body lift Dual Flowmasters Super 40's! TBI retrofit completed (2007-07-29) New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17) |
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09-18-2010, 04:51 PM | #6 |
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Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
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Re: TBI 87 350 to 454
^ forgot about the IAC connector when we used a 454 TBI on my son's 383 vortec stroker conversion. Seems like there was one more wire that was different but I can't remember what it was...
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09-18-2010, 05:56 PM | #7 | |
Registered User
Join Date: Oct 2003
Location: OC CA
Posts: 1,374
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Re: TBI 87 350 to 454
Quote:
The correct wiring for the 7.4 IAC valve is as follows : ECM Con Color C3 Pin A Lt blu/blk - Coil A Low C4 Pin B Lt blu/wht - Coil A High C5 Pin C - Lt grn/wht - Coil B High C6 Pin D - Lt grn/blk - Coil B Low
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"The Beast" 1975 Chevrolet C20 longbed 350/700R4! with 3inch body lift Dual Flowmasters Super 40's! TBI retrofit completed (2007-07-29) New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17) |
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