Stroker crank and case borking question

2510 Views 18 Replies 6 Participants Last post by Hillsidecycle.com, Feb 11, 2016

BigNorm

Discussion Starter · Jan 12, 2016

What would the displacement be of a stock 103 with a S&S stroker crank? My guess is a 113. Is case boring necessary to fit a larger cylinder or for clearance for a larger crank? This is for my general knowledge. Thanks as always for your help. :smile:

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JacktheBagger

· #2 · Jan 12, 2016

Without boring , the 103 is a 4.375" stroke

a 4.500" stroke is a 106

a 4.625" stroke is a 109

boring to 4.00"

stock stroke is a 109

4.500" stroke is a 113

4.625 stroke is a 117

increasing one or the other .125" yields around 3 c.i.

JtB

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JacktheBagger

· #12 · Feb 10, 2016

4.125 bore x 4.375 ( stock ) stroke is 117

4.125 bore x 4.500 stroke is 120

4.125 bore x 4.625 stroke is 124

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JacktheBagger

· #18 · Feb 10, 2016

143 is 4.425 bore and 4.625 stroke

if I knew it wud last I wud get it over the 124

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