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An alternative to the dual-diaphragm vacuum booster/aluminum cylinder setup is the Powermaster I electro-hydraulically boosted aluminum master cylinder. It has been reported that the Powermaster has a better pedal feel and more boost than even the dual-diaphragm booster. Plus, there are no big-cam/low-vacuum problems. The version to use on the A-body is the one originally installed on 1986 B-body wagons with Olds 307 engines (GM production No. 18013355, current service No. 18018236). Unlike the more common Grand National unit, this version has an angled reservoir that’s more suited to an A-body retrofit. Modify it just like the G-body vacuum booster.
