Intake/TBI bore matching questions
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From: Tacoma, WA
Car: '91 Chevy 1500
Engine: 350
Transmission: 700R4
Axle/Gears: 3.73
Intake/TBI bore matching questions
I have a Holley TBI with the GM 454 injector pod and GMPP intake (because of my Vortec heads). The bores in the throttle body are 2" and the bores in the intake are 1 7/8". My question is has anyone made the bores in their intake match the bores in their throttle body? Are you happy with the results? Did you lose or gain anything? Would you do it again?
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From: Cypress, California
Car: 1989 GTA
Engine: 369 TPI
Transmission: 4L60E
Axle/Gears: 3.70 Nine Bolt
Re: Intake/TBI bore matching questions
From what I know you need to open up the bores in the manifold to match the 2" bores in the throttle body. A step like that can be a killer on horsepower.
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Joined: Dec 2006
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From: Tacoma, WA
Car: '91 Chevy 1500
Engine: 350
Transmission: 700R4
Axle/Gears: 3.73
Re: Intake/TBI bore matching questions
This is on a truck (2 wheel drive, regular cab) so I wonder if I'd notice a loss of bottom end torque?
Joined: Jan 2005
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From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
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Supreme Member
iTrader: (3)
Joined: Sep 2003
Posts: 6,859
Likes: 14
From: Cypress, California
Car: 1989 GTA
Engine: 369 TPI
Transmission: 4L60E
Axle/Gears: 3.70 Nine Bolt
Re: Intake/TBI bore matching questions
Maybe? Orangewood and Valley View. Sorry for the hijack.
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