Crankcase & Bottom End

57 products

Shop the range of aftermarket motorcycle engine products at Pro Class Custom Parts.

$3,889.99

S&S has been making stock bore stroker kits since the early 1960s. They’re still popular today due to the excellent power gains for the money, as well as the easy installation. Stock bore stro...

$4,831.99

The Crankshaft is the heart of any performance engine and S&S Cycle has been perfecting the art for over six decades. Stronger, more durable, and trued to a spec others can only dream of, our ...

$4,831.99

The Crankshaft is the heart of any performance engine and S&S Cycle has been perfecting the art for over six decades. Stronger, more durable, and trued to a spec others can only dream of, our ...

$4,189.99

Features & Benefits:- * Can also be used to upgrade your 1200cc Engine 1973-1980 to 1340cc/80ci Engine. Tech Tips:- * Upgrading your 1200cc Engine 1973-1980 to 80ci/1340cc Engine requires the...

$4,831.99

The Crankshaft is the heart of any performance engine and S&S Cycle has been perfecting the art for over six decades. Stronger, more durable, and trued to a spec others can only dream of, our ...

$3,889.99

Features & Benefits:- * Stock Replacement. * 1990-1999 models require purchase of pinion shaft conversion kit # SS33-4148. Proudly Made in the USA by S&S Cycle !

$4,575.99

Features & Benefits:- * The S&S Super Stock alternator style crankcases are perfect for stock replacement & for high performance applications. * Pre-clearanced for strokes up to &...

CP CARRILLO PISTONS

$2,673.99

Features & Benefits:- * Sets balanced to + or – 1 gram * Made from a forging * Laser engraved * 100% Magnafluxed * Fully CNC Machined * Shotpeend Tech Tips: * Material # 10087 * Rod # HD-MILW...

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CP CARRILLO PISTONS

$2,675.99

Features & Benefits:- * Sets balanced to + or – 1 gram * Made from a forging * Laser engraved * 100% Magnafluxed * Fully CNC Machined * Shotpeend Tech Tips: * Material # 5367 * Rod # HD-VROD&...

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$1,542.99

Features & Benefits:- * 7.440″ Rod Length. * Sold as a Pair. Tech Tips:- * Torque crankpin nuts to H-D specs 180-210 ft/lbs for both OEM & S&S forged flywheels. * Greater torque will ...

$1,542.99

Features & Benefits:- * 7.440″ Rod Length. * Sold as a Pair. Tech Tips:- * Torque crankpin nuts to H-D specs 180-210 ft/lbs for both OEM & S&S forged flywheels. * Greater torque will ...

DAYTONA JAPAN

$1,196.99

Features & Benefits:- * Meets or exceeds OEM specifications * Come completely fitted and ready to install * Complete set includes a two-hole crankpin, aluminium retainers, bearings, nuts and f...