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 |  SKU: 203-A

Kelford Performance Camshafts

Mazda MX-5 NA/Familia (B6/B6T)
$838.20
Camshaft Profile
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Description

This Kelford Cams range of camshafts for Mazda B6 and B6T are our most popular profiles to suit these engines as they were originally manufactured, with hydraulic lifters. We can also manufacture camshafts to suit solid lifters on request; simply contact us to discuss.

If our catalogue offerings don't fit your needs, we can also make any other specification you desire or design one to suit your specific application.

 

Camshaft Profiles - Click "Specifications" Tab for profile data:

203-A:

  • 256/250 Degrees advertised duration, 8.60mm/8.60mm lift.
  • Hot street cams to suit stock engine with stock ECU.

203-B:

  • 264/256 Degrees advertised duration, 9.00mm/9.00mm lift.
  • Stage 2 performance cams to suit mild engine builds.

203-C:

  • 272°/264° Degrees advertised duration, 10.00mm/9.00mm Valve Lift
  • NA Stage 3 racing cams for Mazda B6 engines found in the MX-5 Miata.
  • Good improvement in mid-range to high rpm power compared to OEM cams.
  • Suited to engines with free flowing intake and exhaust systems.
  • Great with ITB intake systems.
  • Great upgrade for cars used for race and rally.
  • Kelford Cams recommend KVS12 valve spring upgrade.

203-D:

  • 256°/256° | 8.70mm/8.50mm
  • Maximize your Mazda B6 engine performance? Ultimate Stage 1 performance cams for your MX-5 Miata. These camshafts are compatible with the OEM turbo on B6T engines, or turbo upgrades sized 44-54mm.
  • You’ll experience a significant improvement in mid-range power compared to your factory cams, without sacrificing street drivability or idle quality.
  • Perfect for spirited driving and track days. For optimal results, Kelford Cams recommends pairing these cams with a KVS12 valve spring upgrade.
  • Please note: Designed for Hydraulic Lifters ONLY

T203-A:

  • 250/256 Degrees advertised duration, 8.70mm/8.50mm lift.
  • Fast street cams to suit stock turbo and stock ECU.

T203-B:

  • 264/264 Degrees advertised duration, 8.95mm/8.95mm lift.
  • High performance cams to suit hot street or rally applications. Requires KVS12 valve springs.

T203-C:

  • 272°/272° | 10.00mm/9.00mm
  • Stage 3 turbo racing cams for Mazda B6 engines. Suits turbocharged MX-5 Miata or factory turbo B6T engines in the Familar. Turbo sizing 48mm+. For high rpm racing engines running high boost. Great with E85.
  • Kelford Cams recommend KVS12 valve spring upgrade.
  • Please note: Designed for Hydraulic Lifters ONLY

T203-D:

  • 280°/280° | 10.20mm/10.20mm
  • Stage 4 turbo racing cams for Mazda B6 engines. Suits turbocharged MX-5 Miata or factory turbo B6T engines in the Familar. Turbo sizing 54mm+. For high rpm racing engines running high boost. Great with E85.
  • Kelford Cams recommend KVS12 valve spring upgrade.
  • Please note: Designed for Hydraulic Lifters ONLY

Technical Specifications

203-A

Engine Make: Engine Model: Part Number:
MAZDA Miata 323 B6 NA 203-A
Valve Clearance: Intake:   Set   at the  
  Exhaust:   Set   at the  
 
Cam Lift:   Intake: 8.60mm Exhaust: 8.60mm
Rocker Ratio:   Intake: 1 Exhaust: 1
Nett Valve Lift:   Intake: 8.60mm Exhaust: 8.60mm
Advertised Duration @ 0.10mm Intake: 256 Exhaust: 250
Duration @ 1.00mm VALVE LIFT Intake: 216 Exhaust: 210
Timing @ 1.00mm VALVE LIFT IVO: 2 ATDC EVO: 35 BBDC
    IVC: 38 ABDC EVC: 5 BTDC
Suggested Centre Lines:   Intake: 110 Exhaust: 110
VALVE Lift @ TDC Intake: 0.85mm Exhaust: 0.68

 

 

 203-B

Engine Make: Engine Model: Part Number:
MAZDA Miata 323 B6 NA 203-B
Valve Clearance: Intake:   Set   at the  
  Exhaust:   Set   at the  
 
Cam Lift:   Intake: 9.00mm Exhaust: 9.00mm
Rocker Ratio:   Intake: 1 Exhaust: 1
Nett Valve Lift:   Intake: 9.00mm Exhaust: 9.00mm
Advertised Duration @ 0.10mm Intake: 264 Exhaust: 256
Duration @ 1.00mm VALVE LIFT Intake: 222 Exhaust: 216
Timing @ 1.00mm VALVE LIFT IVO: 3 BTDC EVO: 38 BBDC
    IVC: 39 ABDC EVC: 2 BTDC
Suggested Centre Lines:   Intake: 108 Exhaust: 110
VALVE Lift @ TDC Intake: 1.32mm Exhaust: 0.80

 

203-C

Engine Make: Engine Model: Part Number:
MAZDA Miata 323 B6 NA 203-C
Valve Clearance: Intake:   Set   at the  
  Exhaust:   Set   at the  
 
Cam Lift:   Intake: 10.00mm Exhaust: 9.00mm
Rocker Ratio:   Intake: 1 Exhaust: 1
Nett Valve Lift:   Intake: 10.00mm Exhaust: 9.00mm
Advertised Duration @ 0.10mm Intake: 272 Exhaust: 264
Duration @ 1.00mm VALVE LIFT Intake: 230 Exhaust: 222
Timing @ 1.00mm VALVE LIFT IVO: 9 BTDC EVO: 39 BBDC
    IVC: 41 ABDC EVC: 3 BTDC
Suggested Centre Lines:   Intake: 106 Exhaust: 108
VALVE Lift @ TDC Intake: 2.10mm Exhaust: 1.32

 

 T203-A

Engine Make: Engine Model: Part Number:
MAZDA Miata 323 B6 Turbo T203-A
Valve Clearance: Intake:   Set   at the  
  Exhaust:   Set   at the  
 
Cam Lift:   Intake: 8.70mm Exhaust: 8.50mm
Rocker Ratio:   Intake: 1 Exhaust: 1
Nett Valve Lift:   Intake: 8.70mm Exhaust: 8.50mm
Advertised Duration @ 0.10mm Intake: 250 Exhaust: 256
Duration @ 1.00mm VALVE LIFT Intake: 210 Exhaust: 216
Timing @ 1.00mm VALVE LIFT IVO: 5 ATDC EVO: 40 BBDC
    IVC: 35 ABDC EVC: 4 BTDC
Suggested Centre Lines:   Intake: 110 Exhaust: 112
VALVE Lift @ TDC Intake: 0.80mm Exhaust: 0.56

 

 

 T203-B

Engine Make: Engine Model: Part Number:
MAZDA Miata 323 B6 Turbo T203-B
Valve Clearance: Intake:   Set   at the  
  Exhaust:   Set   at the  
 
Cam Lift:   Intake: 8.95mm Exhaust: 8.95mm
Rocker Ratio:   Intake: 1 Exhaust: 1
Nett Valve Lift:   Intake: 8.95mm Exhaust: 8.95mm
Advertised Duration @ 0.10mm Intake: 264 Exhaust: 264
Duration @ 1.00mm VALVE LIFT Intake: 222 Exhaust: 222
Timing @ 1.00mm VALVE LIFT IVO: 1 BTDC EVO: 43 BBDC
    IVC: 41 ABDC EVC: 1 BTDC
Suggested Centre Lines:   Intake: 110 Exhaust: 112
VALVE Lift @ TDC Intake: 1.10mm Exhaust: 0.96

Fitment Table