S&S CYCLE - 90-1004 - Cylinder Head Kit - Super Stock - Natural - Evolution Big Twin '88-'99
The S&S CYCLE 90-1004 is a cylinder head kit - super stock™ - natural - evolution big twin '88-'99 engineered for street applications where fit, function, and build quality are the baseline expectation. S&S heads give great performance, and work with additional upgrades. Compatible with stock 3-1/2” or 3-5/8” bore engines, giving you a level of quality that holds up across the full service life of the component. Fully assembled, and include stainless steel valves and high-lift springs (up to .640 lift). Large 2.000” intake and 1.605” exhaust valves and high flowing ports supply plenty of air for big inch engines. Must reuse stock headbolts. For riders who know the difference quality components make, the 90-1004 is the right call. Sold as a pair.
Features
- S&S heads give great performance, and work with additional upgrades
- Compatible with stock 3-1/2” or 3-5/8” bore engines
- Fully assembled, and include stainless steel valves and high-lift springs (up to .640 lift)
- Large 2.000” intake and 1.605” exhaust valves and high flowing ports supply plenty of air for big inch engines
- Must reuse stock headbolts
- Made in the USA
- S&S Super Stock piston kits are required.
- Intake manifold, pistons and gasket kits are sold separately.
Specs
- Riding Style: Street
- Color/Finish: Natural Aluminum
- Units: Pair
- Model: Super Stock
- Product Name: Cylinder Head Kit
- Material: Aluminum
Frequently Asked Questions - S&S CYCLE - 90-1004 - Cylinder Head Kit - Super Stock - Natural - Evolution Big Twin '88-'99
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.
