| Precision Black
Diamond Valves The Precision BLACK DIAMOND valves are on piece stainless steel with stellite tips on both intake and exhaust. Valves are precision ground then impregnated with the Black Diamond coating from .002 into the steel, out to the finish of .0002 thick. This coating reduces friction, wear & allows for closer guide tolerances. BLACK DIAMOND valves are designed to increase air flow, even in stock heads. |
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Black Diamond 2005 up Twin Cam 7mm Valves |
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Black Diamond Valves for 2005 Big Twins using 7mm Valve Stems. |
| TEC # | Years | Head Dia. |
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| 87840 | Intake | 2005+ | Std | 1.805 | |
| 87841 | Intake | 2005+ | Oversize | 1.900 | |
| 87844 | Exhaust | 2005+ | Std | 1.575 | |
| 87845 | Exhaust | 2005+ | Oversize | 1.630 |
| Twin Cam Valves through 2004 | |||||
| TEC # | Years | Head Dia. | Replaces | ||
| 86900 | Intake | 84-04 | Std | 1.840 | 18074-83A |
| 86901 | Intake | 84-04 | Oversize | 1.940 | 20-4169 |
| 86903 | Intake | 84-04 | Race | 1.900 | 20-4171R |
| 86923 | Exhaust | 99-04 | Oversize | 1.565 | 20-20057 |
| Evolution Big Twin Valves | |||||
| TEC # | Years | Head Dia. | Replaces | ||
| 86900 | Intake | 84+ | Std | 1.840 | 18074-83A |
| 86901 | Intake | 84+ | Oversize | 1.940 | 20-4169 |
| 86903 | Intake | 84+ | Race | 1.900 | 20-4171R |
| 86904 | Exhaust | 84+ | Std | 1.615 | 18082-83 |
| 86907 | Exhaust | 84+ | Race | 1.630 | 20-4170R |
| 86921 | Exhaust | Branch | .060 | 20-B101 | |
| Evolution Blank Extra Long Stem Valves | |||||
| TEC # | Years | Head Dia. | Replaces | ||
| 86902 | Intake | 84+ | Oversize | 2.100 | 20-4171B1 |
| 86906 | Intake | 84+ | Oversize | 2.000 | 20-4171B |
| 86922 | Intake | 84+ | Oversize | 2.250 | 20-4171B2 |
| 86908 | Exhaust | 84+ | Oversize | 1.715 | 20-4170B |
| 86909 | Exhaust | 84+ | Oversize | 1.750 | 20-4170B1 |
| 74" & 80" Shovelhead Valves | |||||
| TEC # | Years | Head Dia. | Replaces | ||
| 86825 | Intake | 66-83 | Std | 1.950 | 18074-66 |
| 86826 | Intake | 66-83 | Oversize | 2.000 | 20-4256 |
| 86828 | Exhaust | 48-83 | Std | 1.750 | 18082-57 |
| 86829 | Exhaust | 48-83 | Oversize | 1.812 | 20-4195-1 |
| 86830 | Exhaust | 48-83 | Oversize | 1.780 | 20-4195-S |
| 74 " Panhead Valves | |||||
| 86824 | Intake | 48-65 | Std | 1.750 | 18071-48 |
| 86828 | Exhaust | 48-65 | Std | 1.750 | 18082-57 |
| 74" & 80" Shovelhead Thin Stem Valves | |||||
| TEC # | Head Dia. | Replaces | |||
| 86840 | Intake | 1.950 | 20-4265 | ||
| 86842 | Exhaust | 2.000 | 20-4256 | ||
| Shovelhead Blank Extra Long Stem Valves | |||||
| TEC # | Head Dia. | Replaces | |||
| 86844 | Intake | 3/8 stem | 2.100 | 20-4194B | |
| 86846 | Exhaust | 3/8 stem | 1.850 | 20-4195B | |
| Knucklehead Valves | |||||
| TEC # | Years | Head Dia. | Replaces | ||
| 86847 | Intake | 36+ | Std | 1.750 | 18071-36 |
| 86848 | Exhaust | 36+ | Std | 1.750 | 18081-36 |