ENGINE SECTION RED PART NUMBERS INDICATE NEW PARTS 6-32 1 2 3 4 5 6 7 8 9 10 11 CONTENTS REFERENCE GENERAL EXHAUST FUEL DRIVE TRAIN ENGINE WHEEL CONTROL FRONT END FRAME ELECTRICAL Valves All Precision Machining, Inc. one piece stainless steel valves are impregnated by a special German Process (Nitroneg) .002” deep & .0002” surface build up to improve wear properties and reduce friction. This process provides resistance to corrosion and wear superior to that developed by hard chromium and electroless nickel plating. These valves are light, and the profiles provide excellent flow characteristics and are stellite tipped. Sold each. Head Stem Model & Year Type Rpls. HD # Diameter Diameter Overall Length Part # Panhead 1948/1965 Intake 18071-48 Std 1.750” .3765” Std 3.800” 61084 Exhaust 18082-57 & 18086-80 Std 1.750” .376” Std 3.820” 61083 Shovelhead 1966/1984 Intake 18074-66 & 18075-81 Std 1.950” .3765” Std 3.885” 61082 Intake –– O.S. 2.000” .3765” Std 3.885” 61154 Exhaust 18082-57 & 18086-80 Std 1.750” .376” Std 3.820” 61083 Exhaust –– O.S. 1.780” .376” Std 3.820” 61156 Big Twin Evolution Intake 18074-83A Std 1.840” .3107” Std 4.445” 61096 1984/Later Exhaust 18082-83 Std 1.615” .3096” Std 4.520” 61097 Twin Cam 1999/2004 Intake 18074-83A Std 1.840” .3107” Std 4.445” 61096 Exhaust 18085-99 Std 1.565” .3101” Std 4.515” 61172 Twin Cam 2005/Later Intake 18074-05 Std 1.805” .2755” Std 4.425” 61176 Exhaust 18085-05 Std 1.575” .2755” Std 4.520” 61177 Milwaukee-Eight® 107” & Intake 18000016 Std 1.571” .2347” Std 4.015” 61100 114” 2017/Later Intake –– O.S. 1.630” .2347” Std 4.055” 61101 Exhaust 18000034 Std 1.264” .2342” Std 4.050” 61102 BLACK DIAMOND™ VALVES FOR BIG TWIN AND SPORTSTER Head Stem Model & Year Type Tulip Profile Diameter Diameter Overall Length Part # Big Twin Evolution Intake 23˚ O.S. 1.940” .310” 4.380” (-.060”) 61106 1984/Later Intake 28˚ O.S. 1.900” .3107” 4.440” 61157 Exhaust 44˚ Std 1.615” .3096” 4.575” (+.065”) 61158 Twin Cam Intake 23˚ O.S. 1.940” .310” 4.380” (-.060”) 61106 1999/2004 Intake 28˚ O.S. 1.900” .3107” 4.440” 61157 Head Stem Model & Year Type Rpls. HD # Diameter Diameter Overall Length Part # Ironhead Sportster Intake 18070-58 Std 1.825” .309” Std 3.565” 61167 1958/1969 Exhaust 18080-58A & 18033-80 Std 1.570” .3384” Std 3.510” 61086 Ironhead Sportster Intake 18070-70 &18027-80 O.S. 1.935” .309” Std .3615” 61087 1970/1985 Exhaust 18080-58R & 18033-80 Std 1.570” .3384” Std 3.510” 61086 XLR 1970/Later Intake 18069-65R Std 1.950” .309” Std 3.690” 61088 Exhaust 18080-70R Std 1.750” .3384” Std 3.620” 61089 Evolution Sportster Intake 18031-86 Std 1.585” .310” Std 4.550” 61170 1986/2003 883cc only Exhaust 18030-86 Std 1.350” .309” Std 4.640” 61171 Evolution Sportster 1987 Intake 18023-87 Std 1.710” .310” Std 4.480” 61168 1100cc only Exhaust 18024-87 Std 1.475” .3095” Std 4.560” 61169 Evolution Sportster Intake 18023-87 Std 1.710” .310” Std 4.480” 61168 1988/2003 1200cc only Exhaust 18024-87 Std 1.475” .3095” Std 4.560” 61169 Fits Sportster Fits Big Twin Fits high performance Big Twin
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