Ported Plenum and Runners
Thread Starter
Joined: Apr 2012
Posts: 77
Likes: 1
From: Pennsylvania
Car: 1989 Formula Firebird
Engine: 305 TPI
Transmission: 5-speed
Axle/Gears: 3:45
Ported Plenum and Runners
I have an 89 Formula LB9 5-speed car and want to port the plenum and runners. The car has 1.6 roller rockers, holley fuel pressure regulator, air foil, K&N filter and dual cats. Should I get a 52mm throttle body to go along with the porting or keep the stock 48mm? Also fuel gauge is stuck passed full after they put the regulator in, could it be a short somewhere? Thanks!
Joined: Feb 2001
Posts: 8,494
Likes: 411
From: Sophia, NC
Car: 2016 Camaro SS + 1986 Z28
Re: Ported Plenum and Runners
The stock 48mm is more than plenty for what you've got.
I don't see how a AFPR would affect the fuel gauge. Probably the sending unit. Mine did that, and would stay pinned beyond full until 1/4 tank.
I don't see how a AFPR would affect the fuel gauge. Probably the sending unit. Mine did that, and would stay pinned beyond full until 1/4 tank.
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