Designed as an out of the box replacement part for smaller displacement engines, these S&S heads provide a significant performance increase. Whether you're looking for an easy way to run a high lift cam, or are faced with refreshing a tired engine with an overhaul, these heads will let your engine breathe while providing the same compatibility as stock heads.
Fits 1984–'99 big twins:
- Stock displacement
- Stock bore strokers
- Big bore engines up to 96"
Features and Benefits:
- Compatible with stock or other flat topped pistons
- Heads can be decked .060" if higher compression is desired
- Port design increases flow, while maintaining velocity specifically designed for stock and small displacement engines
- Compatible with up to .585" lift cams with TDC lifts of .252" intake and .210" exhaust
- Stock diameter ports allows installation of original intake manifolds and exhaust
- Stock temperature sensor location for EFI equipped engines
- High compression is 76cc, low compression is 82cc in chamber
Kit contains two complete heads with valves and springs.
| S&S® Performance Replacement Cylinder Heads for Evolution® Engines |
| Finish |
Low Compression 82cc (stock displacement) |
High Compression 76cc (stock displacement) |
| Natural |
106-3466 |
106-6059 |
| Black Powdercoat |
106-4570 |
106-6064 |
| Polished |
106-4575 |
– |
| Special Order* |
106-5696 |
| *Use the Special Order part number to order front or rear replacement cylinder head assemblies. Replacement heads are only available assembled, complete with valves and springs. Call for pricing. |
| Compression Ratio Comparison Chart |
Engine Size
|
S&S Performance Replacement |
Stock H-D® |
| High Compression 76cc |
Low Compression 82cc |
| 96" |
10:01 |
9.5:1 |
9.75:1 |
| 89" |
9.4:1 |
8.9:1 |
9.25:1 |
| 80" |
8.8:1 |
8.4:1 |
8.5:1 |
NOTE: S&S recommends that all clearances be checked with high lift cams, especially if the heads have been decked to increase compression.
