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 As previously mentioned, we followed the recommended break-in procedure of the new valve springs. Next, the ignition timing (20 degrees initial, 35 degrees total) and the Proform 950 carburetor (four fuel mixture screws and the curb idle screw) were adjusted so both timing and curb idle (1,200 rpm at operating temperature) would be the same before we checked engine vacuum. We were delighted to see engine vacuum increase by 2 lb/in. That’s additional vacuum to the power brake booster for our four-wheel Wilwood disc brakes. On a test drive through the local back roads, the Nova exhibiteded less brake pedal effort, increased throttle response and smoother, stronger power throughout the rev range. Best of all, we got more (and vastly improved) high rpm pull.