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Shop Engine Top End Cylinder Heads for Flathead
Aluminum Cylinder Heads

Aluminum Cylinder Heads

Cylinder heads »#6«; fits 45” W & G models 1936-1973; aluminum; nominal bore: 2-3/4 ”; compression: 6 : 1; head bolt pattern: Flathead 8 bolt; plug threads: 1 x M18 x 1.5 x 12.7 mm; replaces OEM HD 16681-39, and 16683-39; gross weight: 4.46 kg
Cylinder heads »#6«; fits 45” W & G models 1936-1973; aluminum; nominal bore: 2-3/4 ”; compression: 6 : 1; head bolt pattern: Flathead 8 bolt; plug threads: 1 x M18 x 1.5 x 12.7 mm; replaces OEM HD 16681-39, and 16683-39; gross weight: 4.46 kg
Cylinder heads »#6«; fits 45” W & G models 1936-1973; aluminum; nominal bore: 2-3/4 ”; compression: 6 : 1; head bolt pattern: Flathead 8 bolt; plug threads: 1 x M18 x 1.5 x 12.7 mm; replaces OEM HD 16681-39, and 16683-39; gross weight: 4.46 kg
Cylinder heads »#6«; fits 45” W & G models 1936-1973; aluminum; nominal bore: 2-3/4 ”; compression: 6 : 1; head bolt pattern: Flathead 8 bolt; plug threads: 1 x M18 x 1.5 x 12.7 mm; replaces OEM HD 16681-39, and 16683-39; gross weight: 4.46 kg
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Select subgroup:
for 45
for 45"/750cc Flathead
for Big Twin Flathead
for Big Twin Flathead
Select variant:
62-403
»#6«; compression: 6 : 1; replaces OEM HD 16681-39, and 16683-39
62-402
»#5«; compression: 5.1 : 1; replaces OEM HD 16692-40, and 16695-40
Price and stock:
Item №
62-403
Price incl. VAT
705.61 €
Available
6
Ready for immediate delivery from our Würzburg, Germany warehouse
The price includes 112.66 € German VAT.
pair
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Facts
Description
  • Cylinder heads »#6«
  • fits 45” W & G models 1936-1973
  • aluminum
  • nominal bore: 2-3/4 ”
  • compression: 6 : 1
  • head bolt pattern: Flathead 8 bolt
  • plug threads: 1 x M18 x 1.5 x 12.7 mm
  • replaces Harley-Davidson part number HD 16681-39, and 16683-39
  • gross weight: 4.46 kg

Aluminium cylinder heads for Flatheads. Harley-Davidson decided to use aluminium cyclinder heads in 1940, as these have much better heat dissipation abilities than comparable cast-iron cylinders heads. Set of front and rear cylinder head.

Accessories:

Washers for Cylinder Head Bolts: SV Aluminum Heads

Washers for Cylinder Head Bolts: SV Aluminum Heads

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Cylinder Head Bolts Kits: Big Twin Flatheads with Aluminum Heads

Cylinder Head Bolts Kits: Big Twin Flatheads with Aluminum Heads

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See also:

VT-Cycle ULR Cylinder Heads

VT-Cycle ULR Cylinder Heads

A few more extra ponies for that old Big Flathead won’t hurt and you will get them fairly easy with a set of these ULR cylinder heads, made from cast aluminum. While looking quite original on the outside they feature an advanced combustion chamber design for improved combustion and breathing. Chamber volume is 100 cc, giving 6.1:1 compression on a 74” and 6.5:1 on an 80” motor. Substantially more material allows for custom milling and pop-up pistons. Another update are the 14mm sparkplug threads (3/4” long) for modern and more common plugs....
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