Vented Gas Cap

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Nov 12, 2010 | 04:16 PM

Nervous2

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Joined: Jul 2006

Posts: 63

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Car: 1985 TRANSAM

Engine: 305

Transmission: 700R4

Axle/Gears: 3.27

Vented Gas Cap

Looking for a vented gas cap for my third gen transam? Any Ideas - part numbers?

Nov 12, 2010 | 05:55 PM

bsn1989

Junior Member

Joined: Aug 2010

Posts: 44

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From: Lancaster, WI

Car: 1984 Firebird

Engine: 388 CI, Lunati Cam, Ported Heads

Transmission: 700r4 Pro-Built

Axle/Gears: 3.23 10 Bolt with mini spool

Re: Vented Gas Cap

Do you already have a gas cap on it? If so just drill a tiny hole in it and save yourself some money. Thats what I did and it works great! Much cheaper!

Nov 12, 2010 | 07:03 PM

camaronewbie

Supreme Member

Joined: Sep 2002

Posts: 9,192

Likes: 20

From: Cary, North Carolina

Car: 1992 RS

Engine: Carbed 350

Transmission: 700R4

Axle/Gears: 3.42 posi

Re: Vented Gas Cap

Or grab one for a 1984 carbed 3rd gen car - they were vented.

Nov 12, 2010 | 07:19 PM

Nervous2

Thread Starter

Junior Member

iTrader: (3)

Joined: Jul 2006

Posts: 63

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Car: 1985 TRANSAM

Engine: 305

Transmission: 700R4

Axle/Gears: 3.27

Re: Vented Gas Cap

Same part numbers for the 1985 Transam which is non-vented

Nov 12, 2010 | 07:38 PM

hairysox33

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Re: Vented Gas Cap

I have to ask, on my 91 Z28, I have a seemingly common issue where pressure, or vacuum gets built up in the tank. Why is this... Is there a tank vent that gets clogged over time? GM wouldn't design the cars overlooking this would they?