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Thread: Why do TBI intake gaskets have coolant passage restrictor holes?

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  1. #1
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    Why do TBI intake gaskets have coolant passage restrictor holes?

    I am putting a rebuilt gen I SBC under the TBI setup in my 88 K1500. I have several sets of fel pro regular SBC intake gaskets that I was intending to use. However, I see after pulling the intake from the 350 TBI in the K1500, that it has metal restrictor plates in the rear coolant passages. What is the purpose of these restrictors, and do I have to use them when I put the new engine in? Or is it fine to use regular SBC intake gaskets with the TBI manifold, with no restrictors?

    Thanks

    Steve
    1988 K1500. TPI conversion (mass air), self burned prom, LT1 roller cam, rebuilt and ported 083 heads, headers, 3" single exhaust
    1999 C1500. 5.7 vortec swap. Flat top pistons, balanced rotating assy, LT1 roller cam, GMPP Vortec heads, EFILive V2 tuner. 4" lift spindles 1.5" rear blocks.

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    Registered User bwood's Avatar
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    Re: Why do TBI intake gaskets have coolant passage restrictor holes?

    Im just guessing, but isn't that where the heater hose is connected? The restirctor is probably to limit the amount of flow through the heater core to get the proper pressure and temp drop across the coil.
    1998 GMC Sierra SLE 1/2 ton 2WD 305 Vortec
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