Pushes the power band up to 6000-6500 rpm based on duration. Same couple of lobes or durations just mixed for the different applications and power bands that make up most of the "upgrade" chevy street performance cams.Ĭomp and other have newer versions of these with different lobe shape and lift, but hydraulic lifters can only handle so much ramp on the lobe.
You'll see many street performance cams in the following range The aftermarket used more split profile cams to give the exhaust side more lift or duration to bolster the performance. Many of those cams were released in the 70's and 80's with 76cc or double humps being the standard heads. It's very similar to most street performance cams. We know this will idle well and pull vacuum or GM wouldn't have put it in a factory ride.
480 then the lobes are moved around for whatever duration to set power band. If you look thru the cam catalogs for "RV" "Street Performance" small chevy cams. Recommended RPM range with matching componentsĬam Timing: TAPPET Opens Closes Max Lift Duration Spring Requirements: Triple Dual Outer Inner On zero lash and theoretical rocker arm ratios. Lift: Intake 3286 493 All Lifts are based Here is the 140 cam info in more detail, this is from crane who sells a copy of it: Here is a more complete list of SBC cams:Ĭhevrolet Factory Cam Specs by part number
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