S&S CYCLE - 310-1158 - V124 Long Block Engine - Black Edition - Big Twin | Custom Chasis w/Alternator-Style Primary
Whether restoring a machine to factory spec or building something better, the S&S CYCLE 310-1158 gives you an engine that meets the demands of serious street use. For '84-'99 Evolution Big Twin or '70-'99 custom chasis with alternator-style primary. Specially machined cylinder heads allow use of stock length manifold, use your existing carb (re-jetting is required), giving you a level of quality that holds up across the full service life of the component. Designed to bolt into stock or aftermarket EFI, carburetor or air cleaner. Crank and case machined for crank position sensor. Includes S&S cylinder heads, S&S valve springs, forged rocker arms, 640 cam, three piece flywheel assembly, 1.671” diameter crankpin, 0.927” wristpins, high-volume high pressure oil pump, electric compression releases and forged pistons. The 310-1158 is the kind of component that earns its place in any build or repair by doing exactly what it is supposed to, every time. Sold individually.
Features
- For '84-'99 Evolution Big Twin or '70-'99 custom chasis with alternator-style primary
- Specially machined cylinder heads allow use of stock length manifold, use your existing carb (re-jetting is required)
- Designed to bolt into stock or aftermarket EFI, carburetor or air cleaner
- Crank and case machined for crank position sensor
- Includes S&S cylinder heads, S&S valve springs, forged rocker arms, 640 cam, three piece flywheel assembly, 1.671” diameter crankpin, 0.927” wristpins, high-volume high pressure oil pump, electric compression releases and forged pistons
- Made in the USA
- Will require a performance ignition and performance carburetor.
Specs
- Color/Finish: Black
- Displacement: 124”
- Model: V124
- Stroke Length: 4-5/8”
- Product Name: Engine
- Type: Long Block
- Compression Ratio: 10.8:1
- Riding Style: Street
- Units: Each
- Piston Material: Forged
- Bore Size: 4-1/8”
Frequently Asked Questions - S&S CYCLE - 310-1158 - V124 Long Block Engine - Black Edition - Big Twin | Custom Chasis w/Alternator-Style Primary
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.
