Shop Engine Top End Cylinder Heads
for Evolution and Twin Cam

for Evolution and Twin Cam

Smooth Profile Rockerbox for Evolution Big Twin
Smooth Profile Rockerbox for Evolution Big Twin
Deep recesses completely enclose the upper cover screws for a continuous, sharp edge from front to rear and an improved outer profile. Order 2 pieces per engine.
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OEM Style Rockerbox for Evolution Big Twin
OEM Style Rockerbox for Evolution Big Twin
Complete rocker cover assemblies for all Big Twins with Evolution engine from 1984–1991 and 1992 to present. Each kit contains one 3-piece cover for one cylinder head and all necessary gaskets and hardware.
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Rocker Arm Bushings OEM
Rocker Arm Bushings OEM
Stock replacement rocker arm bushings for all 1966→ Big Twins and 1957→ Sportster models.
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Jims Rocker Arm Bushings
Jims Rocker Arm Bushings
Stock replacement rocker arm bushings made from top notch Mil Spec bearing bronze for all 1966→ Big Twins and 1957→ Sportster models.
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Rocker Arm Shafts Evolution and Twin Cam
Rocker Arm Shafts Evolution and Twin Cam
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Rocker Arms for Evolution and Twin Cam
Rocker Arms for Evolution and Twin Cam
Replacement rocker arms for all Evolution and Twin Cam models. Comes ready to be installed.
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Rocker Arm Shims
Rocker Arm Shims
The most common reason for noisy rocker arms is too much side-play. These shims are a fast and easy way to solve this problem.
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S&S Rocker Arms Evolution and Twin Cam
S&S Rocker Arms Evolution and Twin Cam
If you are looking for something better than stock Evolution or Twin Cam style rocker arms, this is it! An economical solution for stock rebuilds, and mild performance upgrades. Forged from 4140 steel for greater strength than stock or cast steel rocker arms. In addition they feature the same .750“ long rocker shaft bushings as our S&S roller rockers do, for 50% more load bearing area than in stock and other aftermarket rocker arms. The valve contact tips are induction hardened for extended durability. Thousands of hours of engine testing have proved them to be superior to any non-roller rocker arm on the market. Recommended for cams of .585“ lift or less.
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S&S Rocker Arm Shafts Evolution and Twin Cam
S&S Rocker Arm Shafts Evolution and Twin Cam
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Cylinder Head Bolts 1985→
Cylinder Head Bolts 1985→
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Cylinder Head Bolts Kits: Evolution and Twin Cam
Cylinder Head Bolts Kits: Evolution and Twin Cam
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OEM-Type Rockerbox Screws for Evolution
OEM-Type Rockerbox Screws for Evolution
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Studs for Exhaust Port (Cylinder Head)
Studs for Exhaust Port (Cylinder Head)
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Studs for Top Motor Mount Evolution
Studs for Top Motor Mount Evolution
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Standard Head Bolt Covers
Standard Head Bolt Covers
Attractively priced head bolt covers for all Evolution models 1986–up.
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Jims Forceflow Cylinder Head Cooler
Jims Forceflow Cylinder Head Cooler
This smooth streamline device will keep your Twin Cam running cooler even on your second stop and go ride around Lake Faak in the midday heat. The Jims R & D department has come up with a fan system, that has been adapted from NASCAR race car brake coolers and which will drop your head temperatures by as much as 37° C. It mounts in the horn area, so the Jims team has designed a horn relocater hidden inside the housing. The fan can be installed to be turned on and off manually or it can be regulated by a thermostat controlled sensor. This kit is highly recommended for performance motors to help extend engine life. Complete kit includes high powered fan, housing, horn, hardware and all wiring, along with detailed instructions. Designed for Twin Cam models but can be fitted to other models with some fabrication.
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Washers for Cylinder Head Bolts: Evolution Big Twin and XL
Washers for Cylinder Head Bolts: Evolution Big Twin and XL
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Multi Use Seal Washers
Multi Use Seal Washers
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Have any questions?

Our service team will be glad to help out: Mondays - Thursdays 08:00-17:00 CET, Fridays 08:00-16:00 CET, Phone: +49 / 931 250 61 16, eMail: service@wwag.com