What is the manifold surface measurement and why is it important?

The manifold surface measures .064 inches. This dimension is critical for ensuring a proper seal between the cylinder head and your intake manifold, preventing air leaks and maintaining optimal fuel-air mixture for performance.

Are these cylinder heads compatible with all Big Twin engines from 1984-1999?

These heads are designed for the 1984-1999 Big Twin engine platform. It's always recommended to confirm specific fitment with your motorcycle's make and model to ensure proper installation and performance.

What does it mean that these heads are not CARB approved?

CARB (California Air Resources Board) approval means a part meets specific emissions standards for use in California. Since these heads are not CARB approved, they cannot be legally shipped to or installed on vehicles in California.

Specifications

Brand: S&S Cycle
Part #: 900-1130
UPC: 900-1130

S&S Cycle 84-99 BT 91cc .064in Manifold Surface Cylinder Heads - Silver

Name: S&S Cycle 84-99 BT 91cc .064in Manifold Surface Cylinder Heads - Silver
Brand: S&S Cycle
SKU: s-s-cycle-s-s-cycle-84-99-bt-91cc-064in-manifold-surface-cylinder-heads-silver-t14-664033
Price: 1958.35 USD
Availability: BackOrder

$1958.35

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

S&S Cycle 84-99 BT 91cc .064in Manifold Surface Cylinder Heads - Silver. These heads are built for improved performance on your Big Twin.

Key Features

This product includes a pair of S&S Cycle 84-99 Big Twin cylinder heads.
Features a 91cc combustion chamber volume for specific compression tuning.
Includes a .064 inch manifold surface for precise intake manifold fitment.
Comes with a silver finish for a custom engine bay appearance.
Designed for 1984-1999 Big Twin motorcycle engines.

These cylinder heads are designed for 1984-1999 Big Twin motorcycle engines. Please verify compatibility with your specific motorcycle model and year.

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About this part

Product Details

What you get here are a pair of S&S Cycle 84-99 Big Twin cylinder heads, specifically designed for performance builds. These heads feature a 91cc combustion chamber volume and a .064 inch manifold surface, which are key specs for tuning your engine's compression and airflow. They come in a silver finish, giving your engine bay a clean, custom look.

S&S Cycle is well-known for making parts that help riders get more out of their motorcycles, and these heads are no exception. They're built with solid materials and attention to detail, aiming to improve how your engine breathes and performs. The .064 inch manifold surface is a notable detail, indicating a precise fit for your intake manifold, which is crucial for preventing leaks and ensuring consistent fuel-air mixture delivery. This level of detail in manufacturing helps make sure these heads will work well with your existing engine components, provided your build is within the 1984-1999 Big Twin range.

When you're looking to get more power and better response from your Big Twin, cylinder heads like these are a significant upgrade. They work together with your pistons, camshafts, and exhaust to create a more efficient combustion process. Keep in mind that these heads are not CARB approved, so they cannot be shipped to California. Always refer to the manufacturer's installation guide for specific details on fitting these heads to your engine.