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PERFORMANCE MOTORCYCLE PARTS AND KITS FOR AMERICAN V-TWINS

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Forged 74" Pistons for 1936-'78 OVH Engines

 
 
 
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S&S introduces four new forged pistons, two for 74" engine and two for 80" engines. Both 74" and 80" pistons are available in 8:1 and 9:1 compression ratios.

 

The modern alloys used in these pistons, coupled with the advanced skirt profiles, result in low engine noise and long engine life – in the past, this could only be achieved with cast pistons. The 80" pistons may be used together with 41/4" flywheels to build mild stroker engines for 1936-’78 big twins. However these pistons are only available in 3 1/2" bore, so 74" cylinders will need to be bored to 80" standard bore of 3 1/2".

 

S&S will fit these pistons to your existing cylinders (when purchasing new cylinders, pistons can be fit to them as an option)

 

 S&S FORGED 74"PISTONS 
 Size    8:1 compression    9:1 compression  
 Standard (3 7⁄16")    106-5495    106-5503  
 +.010"    106-5496    106-5504  
 +.020"    106-5497    106-5505  
 +.030"    106-5498    106-5506  
 +.040"    106-5773    106-5775  

 

Notes: Since many older motorcycles have been modified, be sure to confirm that your engine is still stock before ordering replacement pistons.

Using 80” pistons with 74” (3 31/32” stroke) flywheels will result in very low compression and poor performance. Using 74” pistons with 80” (4 1/4” stroke) flywheels will result in contact
between piston and cylinder head, and potential engine damage.

 

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