S&S CYCLE - 310-1396 - 129" Power Package Engine Performance Kit - '17-'25 Harley-Davidson Electra Glide Police FLHTPI, Softail Low Rider ST FXLRST
The S&S CYCLE 129" Power Package Engine Performance Kit features big bore 4.320" cylinder with 11.0:1 forged pistons, S&S oil pump/cam plate, and Passage plugs are removable for servicing.
Features
- Big bore bolt-on kit increases 107" M8 to 129" with no case machining required
- Big bore 4.320" cylinder with 11.0:1 forged pistons
- S&S oil pump/cam plate
- Passage plugs are removable for servicing
- Independent scavenge sections for flywheel cavity and cam chest
- Debris screen in both scavenge pickups
- Magnet in cam chest to help prevent debris from entering the oil pump
- Increased oil flow capacity on both the oil feed and scavenge side
- Adjustable pressure relief valve can be adjusted with the unit installed in the engine
- Quickee pushrods with pushrod tubes
- S&S premium tappets
- S&S hard anodized, black coated tappet cuffs are billet aluminum construction
- S&S valve springs; work with cams up to 0.605" lift
- High performance conical single wire spring design
- HPT496 cam designed for big bore applications
- MLS (multi-layered steel) head gasket
- Includes 129 cam cover badge
- Made in the USA
- Retains stock engine height.
- Works with stock crankcases.
- Works with the stock and S&S roller rocker arms.
- Original engine serial numbers are retained.
- Compatible with the stock valve springs, both first generation (round port) and second generation (oval port).
Specs
- Color/Finish: Highlighted Fins
- Units: Kit
- Features: Chrome Pushrod Tubes
- Cam Drive Type: Chain
- Displacement: 129"
- Style: HPT496 Series
- Cooling System: Oil Cooled
- Product Name: Power Package
- Riding Style: Street
- Bore Size: 4.320"
- Compression Ratio: 11.0:1
- Model: Performance Kit
- Color/Finish: Black
- Type: Engine
Frequently Asked Questions - S&S CYCLE - 310-1396 - 129" Power Package Engine Performance Kit - '17-'25 Harley-Davidson Electra Glide Police FLHTPI, Softail Low Rider ST FXLRST
How do I know if this part fits my vehicle?
Check the fitment information listed on this page against your exact year, make, model, and (where applicable) trim, engine size, or configuration. If your exact vehicle isn't listed, or you're not sure, use the product chat on this page or contact our support team before ordering - we're glad to help confirm fitment.
What does it mean if a product is listed as universal fit?
Universal fit means the product is designed to work across a range of vehicles, not that it's guaranteed to fit every one. Compare the listed measurements, mounting requirements, and connector or hardware specs against your specific vehicle before ordering, since some installations may need additional hardware or minor fabrication.
Where can I find installation instructions for this product?
General installation notes are provided above where available. For detailed step-by-step instructions, refer to the manufacturer's documentation included with the product, or use the product chat on this page for questions about difficulty, required tools, or whether professional installation is recommended.
What if I have more questions about this product?
Use the product chat on this page for fitment, specs, installation, and compatibility questions, or contact our support team directly for help before you order.
