There is another problem encountered with using a non Buick baseplate. Most of the early 70's Buick q-jets use the early style APT. This is a really nice feature and allows for external adjustment of the primary metering rod height in the jets. These carbs will have an aluminum plug in the baseplabe between the mixture screws and a steel post on the bottom of the power piston. It is best to retain the original system.
The 1976 and later front inlet q-jets have the smaller float and later APT design. They are excellent starting points for a really nice carb. There is really very little if any advantage to hogging out the fuel bowl for increased volume. I've done enough dyno and dragstrip testing at this point to know that the fuel system has to be able to keep the carb full on hard runs. Adding more bowl volume is not a bad idea, but will only allow a slight bit more reserve, the real fix is to have a fuel system capable of keeping up.....Cliff
__________________
If you can read this, thank a teacher. If you can read this in English, thank a Veteran!
https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
|