Ported Plenum and Runners

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11-22-2015, 08:35 PM

19875speed

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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!

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11-23-2015, 09:51 AM

Abubaca

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Car: 1988 Iroc

Engine: L98 350

Transmission: 700R4

Axle/Gears: Hawks 8.8 - 3.73

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.