CAMSHAFT RANGE GUIDE CHART

Characteristics of Cams	Range A Hydraulic: Up to 195° Duration: @ .050	Range B Hydraulic: 195°- 210° Duration: @ .050	Range C Hydraulic: 210°- 225° Duration: @ .050 Mechanical: 220°-235° Duration: @ .050	Range D Hydraulic: 225°- 240° Duration: @ .050 Mechanical: 235°-250° Duration: @ .050	Range E Hydraulic: 240°- 255° Duration: @ .050 Mechanical: 250°-265° Duration: @ .050
Idle Quality	Smooth stock type idle.	Good idle.	Fair idle with lope	Rough idle –warning – intake vacuum may be too low for power brakes, etc.	Rough idle with heavy lope –warning- low intake vacuum will not operate power brakes, etc.
Power	Operating range 1000-3200 rpm.	Operating range 1500-4000 rpm. Good low end and mid range.	Operating range 2000-4800 rpm.	Operating range 2200-5400 rpm. Good mid range power.	Operating range 3200-7500 rpm. Good high rpm range.
Torque	Good low end torque, 1600-2000 rpm range	Good low end torque and response in 1800-2600 rpm.	Good mid range torque and response in 2400-3200 rpm range.	Good mid range torque in 3000-4000 rpm range.	Good mid to high rpm torque in 3800-5000 rpm range.
Fuel Efficiency	Best choice with recommended equipment.	Good choice with recommended equipment.	Good when recommended equipment is used.	Average for this type cam with recommended equipment.	Average for this type cam.
Pulling	Good choice for heavy pulling.	Good choice for light pulling.	Not recommended	Not recommended	Definitely not recommended
Racing	Not recommended.	Not recommended.	Mild bracket racing.	Limited oval track-bracket drag racing.	Oval track, bracket drag racing.
RECOMMENDED EQUIPMENT
Engine	Nearly stock overall and in good condition.	Nearly stock overall and in good condition.	Nearly stock overall and in very good condition.	Some modifications required. Check valve to piston clearance.	Competition modifications required. Check valve to piston clearance.
Computer Controlled Vehicles	Computer-Friendly. No modifications. Usually required.	Computer-Friendly. No modifications. Usually required.	Will require some modification (such as aftermarket computer chip) to compensate for low vacuum.	Will require some modification (such as aftermarket computer chip) to compensate for low vacuum.	Will require some modification (such as aftermarket computer chip) to compensate for low vacuum.
Cylinder Heads	Valves & valve seats in good condition.	Valves & valve seats in good condition.	Good valve job & mild port work recom.	Good valve job & mild port work recom.	Competition valve job & port work recom.
Transmission	Stock automatic or manual.	Stock automatic or manual.	Stock automatic or manual.	Standard manual or auto w/high stall converter.	Heavy duty manual or auto w/high stall converter.
Axle Ratio	Stock ratio, 3.50:1 & lower no. range.	Stock ratio 3.20 to 4.20:1 range.	3.70:1 or higher	3.90 to 4.50:1 ratio best.	Over 4.20:1 ratio.
Compression	9.0:l or less	9.5:1 or less.	10.3:1 or less. Check valve to piston clearance.	Increased compression ratio best, 10.5:1 to 11.0:l. Check valve to piston clearance.	Increased compression ratio required, 10.5:1 to 12.0:1. Check valve to piston clearance.
Intake Manifold	Stock or aftermarket 2 plane or torque type.	Stock or aftermarket 2 plane or torque type.	Stock or aftermarket 2 plane or torque type.	Aftermarket performance type.	Aftermarket performance type.
Carburetion	Stock 2 or 4-BBL or low CFM aftermarket sized to rpm range. Rejetting may be necessary.	Stock 2 or 4-BBL or low CFM aftermarket. Rejetting may be necessary.	Stock 2 or 4-BBL or low CFM aftermarket. Rejetting may be necessary.	Large stock or aftermarket 4-BBL, or two low CFM carburetors. Rejet for best performance.	Large aftermarket, 4-BBL, or two small aftermarket 4-BBLs. Rejet for best performance.
Ignition	Recurved stock or aftermarket distributor.	Recurved stock or aftermarket distributor.	Recurved stock or aftermarket distributor.	Good recurved stock or aftermarket distributor.	Good aftermarket system.
Exhaust	Stock or small tube headers	Stock or small tube headers	Stock or small tube headers	Headers recommended.	Competition headers
Lifters	Hyrdaulic-always use new lifters.	Hyrdaulic-always use new lifters.	Hyrdaulic or Mechanical, always use new lifters.	Hydraulic (if operating over 7000 rpm, use Anti-Pump Up) or mechanical, always use new lifters.	Hydraulic (if operating over 7000 rpm, use Anti-Pump Up) or mechanical, always use new lifters.
Valve Springs	See listings for proper Blue Racer springs. Check for coil bind.	See listings for proper Blue Racer springs. Check for coil bind.	See listings for proper Blue Racer springs. Check for coil bind.	See listings for proper Blue Racer springs. Check for coil bind.	See listings for proper Blue Racer springs. Check for coil bind.
Recommended Spring Pressures for HYD. & Mech. Cams	Valve on seat 95 psi. Valve open 240 psi.	Valve on seat 105 psi. Valve open 265psi.	Valve on seat 110 psi. Valve open 280 psi.	Valve on seat 120 psi. Valve open 300 psi.	Valve on seat 125 psi. Valve open 325 psi.
NOTE: Maximum valve open pressure for flat lifter cams is 375 psi, minimum valve on seat pressure is 75 psi. Make sure the spring can be compressed at least an additional .060” beyond maximum valve lift. For best performance, compression, carburetion, intake manifold, headers and ignition should be matched to camshaft.