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Thread: BB TBI on a 3074 intake

  1. #1
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    BB TBI on a 3074 intake

    I have a late model 454 Tbi and the base overhangs the base of the sb 3074 intake and will cause a vacuum leak,
    anyone make a plate of have another way to fix that??
    Thought about JB weld but that would only be a temp repair at best..

  2. #2
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    I've used 1/4" aluminum flat stock to mate a TBI to a Q-jet intake.

  3. #3
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    I’m going to make a plate out of 1/4 aluminum..403BAEC8-4BE1-4FB1-8A1A-646091812DA1.jpg

    But now I need longer mounting bolts
    fix one problem and cause another...........
    Last edited by C2500; 02-26-2018 at 05:41 AM.

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    Yanno...I own that exact intake and through all these forums learned that the bore size is less than 1 11/16" which is smaller than the 4.3/5.0/5.7 TBIs. Anyhoo...care to share how you bored yours out to 2 inches?

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    Quote Originally Posted by stew86MCSS396 View Post
    Yanno...I own that exact intake and through all these forums learned that the bore size is less than 1 11/16" which is smaller than the 4.3/5.0/5.7 TBIs. Anyhoo...care to share how you bored yours out to 2 inches?

    Stew, I took it over to my local machine shop that did the motor for me and had him bore it out to 2.060.
    It took less than a 1/2 hour and he did it on the bridge port..Best part is he didn’t charge me...

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    I bought a 1" TBI spacer with the same footprint for the BB TB. Came with longer mounting bolts and new gaskets for top and bottom. It sealed just fine.

    Quote Originally Posted by C2500 View Post
    Stew, I took it over to my local machine shop that did the motor for me and had him bore it out to 2.060.
    It took less than a 1/2 hour and he did it on the bridge port..Best part is he didn’t charge me...
    You had your 3740 intake bored out? I've heard that it's a 50/50 chance of hitting the water jackets around the throttle bores.
    1990 Chevrolet K2500, RCLB, Blueprint 383 TBI (16197427 ECM / 61 lb/hr / 16 psi FP), NV4500, NP241C, 4.10

  7. #7
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    [QUOTE=Chewy1576;69450]I bought a 1" TBI spacer with the same footprint for the BB TB. Came with longer mounting bolts and new gaskets for top and bottom. It sealed just fine.



    You had your 3740 intake bored out? I've heard that it's a 50/50 chance of hitting the water jackets around the throttle bores.[/QUOTE


    There’s no water around the bores it is in the floor of the intake though

  8. #8
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    Quote Originally Posted by Chewy1576 View Post
    I bought a 1" TBI spacer with the same footprint for the BB TB. Came with longer mounting bolts and new gaskets for top and bottom. It sealed just fine.



    You had your 3740 intake bored out? I've heard that it's a 50/50 chance of hitting the water jackets around the throttle bores.
    Ahhh...my plate was an adapter and not so much a spacer. I never ever purchased a spacer so that thought never crossed my mind.

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