Understanding Shift Points (RPM drop at shift)

1st Gear	2nd Gear	3rd Gear	4th Gear	Rear Gear	Tire Size	Shift RPM

Shift 1st to 2nd	Shift 2nd to 3rd	Shift 3rd to 4th
MPH   RPM	MPH   RPM	MPH   RPM

   

Engine Displacement (bore / 2)² x PI x Stroke x # of Cylinders)

Bore	Stroke	# of Cylinders	Displacement

   

Amount of AIR engine can draw at Redline RPM (CID x Redline RPM / 3456)

Cubic Inch	Red Line RPM	CFM's

   

Carburetor Size Calculator (CID x Redline RPM / 3456) x VE  (Street Carb 0.85, Race Carb 1.10)

Cubic Inch	Red Line RPM	Volumetric Efficiency  (0.85 - 1.10)	CFM's

   

Roller rocker formula for actual cam lift (Cam Lift / Roller Rocker) x New Roller Rocker

Cam Lift	Roller Rocker	New Roller Rocker	Actual Cam Lift

   

Minimum horsepower required to reach a 1/4 mile speed (0.00426 x MPH)³ x WEIGHT

1/4 MPH	Weight	Engine HP