129" Power Kit for M8 - 4.32" / 4 3/8"

Big-bore bolt-on kit that increases 107" M8 to 129" without machining the sump
4.32" diameter cylinders with forged pistons and 11.0:1 compression ratio
S&S oil pump/cam plate with blue anodised finish
Removable service plugs
Independent intake sections for the crankcase and camshaft housing
Debris filter on both suction ports
Magnet in the camshaft housing to prevent debris entering the oil pump
Greater oil flow capacity in both supply and return
Adjustable pressure relief valve, adjustable with the unit installed on the engine
Quickee pushrods
S&S premium studs
S&S hard anodised and black coated tappet cuffs, manufactured from billet aluminium.
S&S 550 cams designed for Big Bore applications
S&S valve springs work with cams up to 0.605" lift
High-performance single-wire conical spring design
Includes all seals, bearings and fixings required for direct installation
Manufactured in the USA
Not suitable for Trike models.



Specifications


Brand
S&S CYCLE


Supplier reference
310-1223C


Features
Chrome pushrod tubes


Engine capacity
129"


Colour/finish
Visually prominent fins, Black Wrinkle


Cylinder Dimensions
4,320"


Stroke length
4-3/8"


Model
Power Package


Product name
Performance Kit


Compression ratio
11,0:1


Cooling system
Oil-cooled


Type
Engine


Distribution type
Chain


Units
Kit