Camshaft Comparison

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There are basically four factory camshaft grinds:

• small bore grind
• large bore grind
• performance grind, used in GX, Twin-carb, and EFI engines
• emission grind, used in 1981-1982 USA engines

However, these can be fitted to any engine. The emission grind cam was used in A12A, A14 and A15 engine -- all with same cam part number.

Duration

"Advertised Duration" means you should only compare these numbers with grinds from the same manufacturer. Other vendors may measure it differently.

Early vs. Late

For 1974, the A-series engine was re-designed. Because the distributor moved from beside cylinder #1 to beside cylinder #3, a new gear was added to the cam. The oil pump eccentric was moved from #3 to #2 at the same time.

Top: 1974-up competition cam

Bottom: 1967-1973 camshaft

Specs

1974-up

• 13001-H9800 CAMSHAFT [Typical use: 1981-1982 USA]

  244/248 duration

  • USA B310 A14,A15 B310 0880-
  • USA B310 A12A 0880- B310
• 13001-H5700 CAMSHAFT [Typical use: Performance engine]

  248/256 duration .331 lift

  • JPN B210 A12T, A14T
  • JPN B310 A14E, A15E
• 13001-H5000 CAMSHAFT [Typical use: A12S]

  248/248 duration

  • JPN B120 A12S
  • JPN B210 A12S
  • JPN B310 A12S, A13S
  • USA B310 A12A 0879-0780
  • CAN B310 A12A
• 13001-H6200 ASSY-CAMSHAFT [Typical use: A14/A15]

  248/256 duration

  • JPN B210 A14S
  • USA B210 A13, A14
  • USA B210 F10 A14
  • USA B310 A14,A15 -0780
  • JPN B310 A14S, A15S

ADVERTISED DURATION

248/248 duration (standard small bore)

• 13001-H5000

248/256 duration (standard large bore)

• 13001-H6200

256/256 duration (performance engines)

• 13001-H5700 .331 lift

244/248 duration (Late USA emission)

• 13001-H9800

1967-1973

• 13001-H7000 ASSY-CAMSHAFT USA B110 A12 0772- 0 13001-H2300
• 13001-H2300 CAMSHAFT B110 JPN A12 GX
• 13001-H1000 CAMSHAFT B110 USA JPN A12
• 13001-18001 CAMSHAFT B10 JPN A10 0470- replaces 13001-18000 & 13001-H0100
• 13001-18000 CAMSHAFT JPN B10 A10
• 13001-H0100 CAMSHAFT JPN B10 A10

ADVERTISED DURATION

248/248 duration

• 13001-H1000 A12

256/256 duration .331 lift

• 13001-H2300 A12 GX

Chart