Kelford Camshafts for Mazdaspeed 3/6

247-A

Drop-in cams to suit OEM valve spring. Ideal for turbo upgrade 48mm-54mm. Excellent throttle response and improved low to mid-range power. Must retain stock rpm limit and not exceed 16psi of boost with stock valve springs. For high mileage engines or higher boost Kelford Cams recommend KVS17-X valve spring upgrade.

247-B

Performance cams for improved mid-range power. Still maintains good street drivability. Ideal for 54mm-60mm turbo upgrade in the 350-500hp range, but still give a good increase for higher horsepower cars that want to maintain street driveability. Great with E85 fuel. Kelford Cams recommend KVS17-X valve spring upgrade to let you rev these out.

247-C

Track racing cams to suit engines in the 500-750hp range. Turbo sizing 58-65mm compressor inducer. Great with E85 or ethanol blend fuels. Kelford Cams recommend KVS17-X valve spring upgrade. 

247-C2

Racing cams for engines in the 650-900hp range. Suits high boost and high rpm wide open throttle race applications. Turbo size 62-68mm. Fuel type E85 or similar blend. Kelford Cams recommend KVS17X-T valve spring and retainer upgrade. 

247-D

Drag racing cams for professionally built engines in the 750-1000HP+ range. Fuel type E85 or methanol. Turbo size 68mm+. Kelford Cams recommend KVS17X-T valve spring and retainer upgrade.