I tried a 650 spreadbore vac secondary Holley on my 400. Got the same fuel economy, but when I finally found someone who could rebuild and tune a Q-jet properly, the Q-jet blew the Holley away for part throttle response and driveability etc.
The Holley is far simpler to tune and play with (for me anyway...lol), but I'm a confirmed believer that Q-jets are good gear!
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Regards,
Leigh
Pontiacs I’ve owned….
1960 Laurentian 283
1963 Laurentian 283
1976 Trans Am 400
1977 Trans Am 400
1951 Chieftain Flat head 6
1967 Firebird 400 convertible
1967 Firebird 400 coupe
1979 Trans Am 403
1971 Formula 455 (clone)
1969 Firebird 350
1968 Firebird 428 manual.
Sydney, Australia
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