Pre-Tuner

iTrader: (2)

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?

1989GTATransAm

iTrader: (3)

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.

RFmaster

You must be right around a corner from me...

Pre-Tuner

iTrader: (2)

This is on a truck (2 wheel drive, regular cab) so I wonder if I'd notice a loss of bottom end torque?

Fast355

iTrader: (2)

You won't lose low-end torque, unless the chip is not setup properly.

Camaro305SB

If the GMPP intake has the room, bore that sucker!

Pre-Tuner

iTrader: (2)

Well that settles it, it will be done.

Thanks everyone.

1989GTATransAm

iTrader: (3)

Maybe? Orangewood and Valley View. Sorry for the hijack.