Rebuilding the TBI on 88 K30... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**57NAPCO** · 01-02-2018, 06:44 PM

I thought I’d go ahead and order the TBI gasket set for one of my trucks. Just finished the top. What a pain in the arse removing the base plate with water inlet/outlet. Should have left it alone...

**57NAPCO** · 01-02-2018, 07:05 PM

The inlet/outlet on the back side that threads into the base won’t budge, crapola

**57NAPCO** · 01-02-2018, 07:45 PM

Anyone know what the heck that base plate with coolant going thru it is for? To cool the TBI?

**57NAPCO** · 01-02-2018, 07:49 PM

**57NAPCO** · 01-02-2018, 07:50 PM

b454rat · 01-02-2018, 08:07 PM

Dunno why they are on there, the later 454s don't have it. I think for faster warm ups, and to keep from hydrolock when hot. I miss my TBI 454s...

**kwmech** · 01-03-2018, 01:53 AM

Supposed to keep the Throttle body hot for better fuel atomization and emissions. Poor design by GM. A replacement manifold from Edelbrock puts the water into the manifold itself without the spacer. Gasket underneath the spacer tends to create a vacuum leak after quite a few miles.

**57NAPCO** · 01-03-2018, 11:00 AM

Thanks!

01-02-2018, 06:44 PM	#1
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,208	Rebuilding the TBI on 88 K30... I thought I’d go ahead and order the TBI gasket set for one of my trucks. Just finished the top. What a pain in the arse removing the base plate with water inlet/outlet. Should have left it alone...

01-02-2018, 07:05 PM	#2
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,208	Re: Rebuilding the TBI on 88 K30... The inlet/outlet on the back side that threads into the base won’t budge, crapola

01-02-2018, 07:45 PM	#3
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,208	Re: Rebuilding the TBI on 88 K30... Anyone know what the heck that base plate with coolant going thru it is for? To cool the TBI?

01-02-2018, 07:49 PM	#4
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,208	Re: Rebuilding the TBI on 88 K30...

01-02-2018, 07:50 PM	#5
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,208	Re: Rebuilding the TBI on 88 K30...

01-02-2018, 08:07 PM	#6
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,453	Re: Rebuilding the TBI on 88 K30... Dunno why they are on there, the later 454s don't have it. I think for faster warm ups, and to keep from hydrolock when hot. I miss my TBI 454s... __________________ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 6” lift 1999 GMC Yukon 350/4L60 4" SAS

01-03-2018, 01:53 AM	#7
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,387	Re: Rebuilding the TBI on 88 K30... Supposed to keep the Throttle body hot for better fuel atomization and emissions. Poor design by GM. A replacement manifold from Edelbrock puts the water into the manifold itself without the spacer. Gasket underneath the spacer tends to create a vacuum leak after quite a few miles.

01-03-2018, 11:00 AM	#8
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,208	Re: Rebuilding the TBI on 88 K30... Thanks!



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