the '69 dualsnorkel and '70-72 slightly tighter spread dual snorkel "GTO" air cleaners were designed to fit on the larger mtg ring of a Quadrajet, not the smaller diam ring of a Carter AFB or that of a ThermoQuad. The typical '68+ Pontiac 4 bbl aircleaner had 1/2" drop, measured from the airhorn surface to the bottom of the aircleaner base.
The '70 and '71-72 TransAm and Formula aircleaners had a different spread between the snorkels than did the 2 other A body dualsnorkel bases. The early 2nd Gen F body aircleaner had a full 1 1/2" drop. These early 2nd Gen 4 bbl bases were often butchered in the front and back to clear the center hung float bowls of a centerhung Holley carb. Have performed several very expensive repairs on such desirable aircleaner bases.
In '73, Pontiac went to one large snorkel with a plastic adapter & a "hairy" hose. Firebirds and '73-74 Ventura's received a deep drop base, the much more common A, B, and GP's received the standard 1/2" drop version. The deep drop version is the style aircleaner that would have been on a '75 T/A, have stacks of them.
With the Street Demon type carb you mentioned having had installed, the deep drop dual snorkels definitely won't fit... big time clearance issues. With just a 1/2" drop stock 4 bbl aircleaner, whether this ThermoQuad looking carb "could be made to fit" would depend on the adaptor ring that was used, and how much it moved the aircleaner up.
Theee are the issues you are going to run into. Have restored a lot of aircleaners, with the help of one older gentleman who does TIG welding for me, have even created very stock appearing deep drop T/A and Formula bases to clear center hung Holleys.
I kinda get tired of reading all the negative viewpoints against the "traditional" flat tappet cam that has been, and still are, used in many engine builds. I really get insulted when the flat tappet cam choice is associated with my age and the generation that I grew up in - as if roller cams...
Lars’s Tuning Secrets: The Common Tuning Tour Observations and Fixes
During the Tuning for Beer World Tour Event Series, I run across some common themes and problems during the tuning. Thought I’d share the most common performance tuning and upgrade issues that we typically see during the...
Has anyone tried comp cams pn. 51-224-4? Preliminary research tells me I may need to machine spring pockets but doesn't say whether it's a diameter or depth issue. It's going into a 67' GTO with the original 72cc combustion chamber, casting # 670 heads with ARP screw in rocker studs.
I bought my wife a '67 LeMans convertible. The poor original OHC6 puked & burnt more oil than I could keep in. 2 months after buying the car, it now has a new XU 1967 400 motor w/ 061 heads. Everything stock with exception to the Melling SPC-7 cam & Comp Cam Roller tip rockers. The car ran...