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Longblock Engine Program

two engines with cut-aways to see the inside
Your engine is the heart and soul of your Harley-Davidson® motorcycle. When the miles start to add up, a Harley-Davidson LongBlock can put the rumble back in your ride simply, quickly, and affordably.
Cut-away to see the inside of an engine
When it comes time to repower your Twin Cam-equipped motorcycle, the first stop should be your local Harley®dealer. They can install a LongBlock replacement engine that is manufactured from 100% new Original Equipment parts and subjected to the same rigorous testing as all Harley engines.
Frequently Asked Questions
Unlike an engine rebuild from the repair shop down the street, the Harley-Davidson LongBlock is manufactured from 100% new Original Equipment components, and is built to the latest factory specifications. Engine includes upgraded Screamin’ Eagle® lefty crankcase bearing, Screamin’ Eagle cam bearings and Screamin’ Eagle performance tappets to handle higher stress loads and performance upgrades. In addition, ’99-’06 LongBlocks are upgraded with late-model hydraulic cam tensioners, high-volume oil pump and billet cam plate. ’07-’13 103CI and 110CI engines feature factory-installed Automatic Compression Releases.
The crankcase is pre-assembled with flywheels, connecting rods, bearings, seals, cylinders, pistons, rings, heads, valves, valve springs, tappets and pushrod covers. Also included and ready for Dealer installation are top end rocker arm supports, rocker arms and shafts, pushrods, and breathers. The LongBlock also includes cam support plate, cam plate bearings, cam and timing chain drive, hydraulic tensioners and all required gaskets and new hardware.
You can choose silver or black- highlighted engines to match your styling direction. Bikes originally equipped with Twin Cam 88 engines can upgrade to 95 or 103CI displacement, and Twin Cam 96-equipped models can be repowered with 103 or 110CI engines, based on specific model fitment. Upgrades require model-specific ECM recalibration (sold separately). *Displacement upgrades are available for vehicles previously equipped with street compliant big bore kits only.
LongBlock is sold without cam shafts, lower rocker boxes, upper rocker box covers, or cam cover. You have the option to re-install your current cams and covers, or select from a wide assortment of performance and custom engine cover options.
Just take your Harley motorcycle to your authorized dealership. They will remove the engine from the frame, ship the left crankcase half to Harley-Davidson, and in a short time, you will have a new LongBlock back, ready for the dealer to reinstall in your bike. Your engine retains its original Vehicle Identification Number (VIN) for easy title exchange and registration.