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83GMCK2500 · 01-02-2014, 06:03 PM

87-91 TBI 454 is carb manifold with adapter plate, is quadrajet flange to tbi flange adapter. Sooooo, technically a newer quadrajet flanged manifold for Vortec heads would accept the tbi w/adapter. Or a square bore manifold with a different TBI adapter plate.

The throttle body on this engine is from a '90 C3500 cab-&-chassis GMT-400, the engine is a Gen VI factory replacement upgraded with Vortec heads, Mercruiser cam, and Edelbrock performer intake.

01-02-2014, 06:03 PM	#6
83GMCK2500 Registered User Join Date: Sep 2009 Location: Beaverton, OR from WA State Posts: 1,515	Re: Vortec 454 87-91 TBI 454 is carb manifold with adapter plate, is quadrajet flange to tbi flange adapter. Sooooo, technically a newer quadrajet flanged manifold for Vortec heads would accept the tbi w/adapter. Or a square bore manifold with a different TBI adapter plate. The throttle body on this engine is from a '90 C3500 cab-&-chassis GMT-400, the engine is a Gen VI factory replacement upgraded with Vortec heads, Mercruiser cam, and Edelbrock performer intake. __________________ Devin 1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt 1996 GMC Sierra SLE 3500 DRW, 4x4, EC/LB, Vortec 454, NV-4500, BW-4401, AAM 925 & AAM 1050 1997 GMC Sierra SLT 1500 4x4, Z71/F44, EC/SB, Vortec 350 My Introduction with my '83s History New Daily, the '96 Last edited by 83GMCK2500; 01-02-2014 at 06:25 PM.