Quote:
Originally Posted by unruhjonny
If we work under the presumption that you are going to want to run as many period correct Pontiac/Firebird parts as possible , then the following needs to be considered.
[b]You cannot use a pre-1973 Firebird air cleaner base with a post-1972 Quadrajet;
The choke pot hits the air cleaner...[b]
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Disagree with you Jon. '73 455 Dport TransAms came with a dual snorkel aircleaner, one that attaches to a '73 bolt on shaker. The main difference between a '73 455 D-port dual snorkel base & one from earlier ('70 RA4 T/A base & '71-72 T/A base), is that the '73 version does not have the passenger side chimney. A '70 Formula base or a '71-72 T/A base will fit right on a '73 or '74 Pontiac Q-jet, just confirmed the fit on my late '73 T/A's original engine with its original 7043265 Qjet & with an SR SD Q-jet.
Late '70's Pontiac Qjets, on the other hand, have a different design airhorn with the vent protrusion located in slightly different spot & that's where repositioning the mating hole, comes into play, in order to use an earlier aircleaner base or asm. Mike Ransom has posted pics before of the minute differences in the bases of the large mouth '73 (SD) through '79 W72 aircleaners. Have examples of all of the bases as well.
Dick, on 3 occasions Ive supplied a wide mouth Pontiac donor snorkel to T/A owners that have contacted me over the years desiring to make a dual large mouth snorkel T/A aircleaner for their car. Basically a Pontiac version similar to a late '70's L82 Vette aircleaner. While this can be done, there are quite a few issues. First, it's best the late 70's Bird is a factory non AC car as room is at a premium for the pass side snorkel. Next, will need a straight on style plastic snorkel adaptor (reproduced) & then it becomes an issue of what flex duct, & where is the flex duct going to be routed to on the front passenger side. have only seen clean results from one of these deals & the owner fabbed a "zip tube" out two molded plastic ducts.