Re: Bought bottom end from Boy Go Fast, should I be worried?
Sorry Greg but rod length and stroke are not related.
You are more likely to get a short rod on a long stroke motor, but you can also get a long stroke and long rod.
As you can get short or long rod on 38mm stroke, the GT5 has short stroke and long rod so high wrist pin piston, however I had a 38mm stroke motor with a short rod before.
Infact I have had motors of all four configurations.
Long rod is 90mm, Short rod is 86mm I believe.
Hence the difference in wrist pin height.
I only have short stroke log rod and long stroke long rod cranks on the bench at the moment but they both take the same piston.