Precise reproductions of stock Knucklehead cylinder heads, cast from aluminum. Besides the significant weight savings of approx. 4 kg per head they dissipate heat much better than their cast iron counterparts. They are manufactured after 1940-1947 heads with large intake ports. The valve seats are pre-installed, but unmachined and sized for stock intake and exhaust valves. They are hardened for the use of today’s unleaded fuels. Steel inserts for the head bolts feature factory threads. The heads show all the small details like cast-in number tags and foundry markings, so they make for excellent stock replacements or for building a performance engine with factory look when you camouflage them with black paint.
- fits OHV models 1936-1947
- cast aluminum, bare
- net weight: 5.35 kg
- nominal bore: 3-7/16 ”
- exhaust flanges G: Knucklehead
- head bolt pattern: Knucklehead
- intake manifold flanges: Knucklehead plumber type (1940-1947)
- oil supply: external
- plug threads: 1 x M18 x 1.5 x 12.7 mm
- replaces OEM 16700-40, and 16697-40
Installation of Valve Guides and TinsUnlike cast iron heads, Knucklehead aluminum heads need to be pre-heated and the valve guides be cooled for proper installation. Important: temperature for the heads must not exceed heat resistance of the valve tin sealant.
Nuts for Rocker Housings OEM Style
Cannonball Rocker Housings
Knucklehead/Panhead Manifold Nipple Conversion Kit
S&S Rocker Arms and Shafts
Cups and Covers for Valve Springs/Rocker Arms
Cannonball Knucklehead Crankcases
All cases feature laser-engraved CB production numbers, which are registered and filed.
Cannonball Knucklehead and Panhead Manifolds 1940-1954
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: email@example.com