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Due to the big Comp Cams Magnum Street Roller (575 lift, 262 at .050 duration), our R/B motor didn't generate enough vacuum at idle or in stop-and-go traffic to properly actuate the power brakes. We tried a vacuum reserve canister, but would use up the vacuum after three or more steps of the pedal (within 15 seconds). We had enough room in the battery tray area to mount the SSBC vacuum pump (PN 28146). The vacuum pump will maintain safe braking even if the mighty 440 stalls.