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PERFORMANCE MOTORCYCLE PARTS AND KITS FOR AMERICAN V-TWINS

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Forged 3 5/8" Bore Piston For 1936-’84 OHV Big Twins

 
 
 
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$289.95
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Description
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Instructions

These forged 3 5/8" bore stroker piston replaces several cast and forged big bore pistons that S&S previously offered. Applications for this piston include 88" (4 1/4" stroke), 93" (4 1/2" stroke), and 96" (4 5/8" stroke) engines with stock 8 1/2" diameter flywheels, and 98" (43/4" stroke) and 103" (5" stroke) engines with 8 1/4" small diameter flywheels. As with the new stock bore stroker piston, the modern metallurgy and advanced skirt profiles allow a relatively close piston fit for low engine noise and long engine life.

 

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 3 5/8" Bore Piston Sets For 1936-’84 OHV Big Twins
Size Part Number
 Standard (3-5⁄8")    106-5535  
 +.010"    106-5536  
 +.020"    106-5537  
 +.030"    106-5538
 +.060"    106-5789 
 Recommended Piston Fit:   Close:   .003" - .0035"   Loose:   .004" - .005"  

 

 

 

3 5/8" Bore Forged Piston Application Chart  
Displacement Stroke 
Flywheel Diameter 
Compression Ratio Cylinder Length  
SH-Series & P-Series Engines   KN-Series Engines  
 88"    4 1/4"    8 1⁄2"    8.5:1    5.330"     
 93"    4 1⁄2"    8 1⁄2"    8.5:1    5.405"    5.625"  
 93" HC    4 1⁄2"    8 1⁄2"    9.1:1    5.363"     
 96"    4 5⁄8"    8 1⁄2"    9.1:1    5.440"     
 98"    4 3/4"    8 1/4"    8.9:1    5.530"     
 103"    5”    8 1/4"    9.7:1    5.630"     
 Note – piston deck height 1.260”

 

NOTE: Compression ratios will change when replacing existing pistons in S&S engines with this series of forged pistons. If higher compression is desired, we suggest shortening cylinders, or decking heads to achieve the desired compression ratio. A change of .060” will produce approximately 1 point of change in the compression ratio.

Overall:
Name:
Rammy KImberly
Date:
12/23/2012
Review:
These pistons worked out good for me ,runs clean
Rating:
Name:
Rammy
Date:
10/20/2012
Review:
I just installed these pistons and so far I like them.
Rating:
Name:
Steve Holcomb
Date:
11/13/2011
Review:
I like the new pistons they run quiet and were easy to install. A special thanks to Steve and Scott in remanufacturing for your help. Keep up the good work!
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