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3 For the baseline, the Proform 950 carburetor featured #80 primary and #86 secondary jets. Total timing was set at 36 degrees (we didn't change the timing during dyno tuning). We previously installed the lightest advance springs that came with the MSD Pro Billet distributor for an aggressive timing advance curve—total timing was all in by 2,400 rpm. The Proform 14x3-inch air cleaner with its cool carbon-fiber solid lid was also part of the baseline package. Notice the absence of a carb spacer. There was not enough hood clearance to add one.