My Garage x


Note: We have recently updated our fitment data. You may need to resave your Year / Make / Model rides into your garage for proper results.



You must login to add rides to your garage.
Login

x

Year:
Make:
Model:
 
Find A Local Dealer

Facebook

Youtube

PERFORMANCE MOTORCYCLE PARTS AND KITS FOR AMERICAN V-TWINS

S&S Cycle logo
My Garage / My Ride
  • Year  
  • Make 
  • Model
0 Items
$0.00

Aluminum Heads for 1937–'48 Flathead Side-Valve Big Twin Engines

 
$625.00
SKU:
106-2475
Qty:
 
Dealer Only Item

 
 
Facebook Twitter
 
 
 
Description
Product Reviews
Specs
Fitment
Instructions

Aluminum cylinder heads were a dealer option on 1937–'39 U-Series sidevalve flathead big twin models. They were standard on 1940–'41, 80" engines and optional on 1940–'48, 74" models. These nine-bolt aluminum cylinder heads can be used as replacement for stock aluminum or cast iron heads on all U-Series side-valve big twin flathead engines from 1937–'48. They will also fit 1936 V-Series side-valve big twins with nine-bolt cylinders.

Cylinder heads for UL engines are available in four compression ratios, 5.5:1, 6:1, 6.25:1 and 7:1. Heads are also available machined for either 14mm or 18mm spark plugs. The compression ratios listed are equivalent to the available stock heads in the 1940s. The 126cc combustion chamber of the 5.5:1 heads is equivalent to the standard low compression heads. If higher compression is desired at a later date, heads with 5.5:1 compression may be milled up to .070" which will make them equivalent to stock high compression heads.

Kit contains front and rear cylinder heads and copper head gaskets. Head bolts are not included.

Harley-Davidson® part number 16671-36.

 

 

 

There are no customer reviews for this product. However, you can be the first person to add a review for this product.

Add Review
Add Review
Name:
Review:
Rating:
 
 
 
 
 
 

(Your browser will be redirected back to this page)