Almost time for the machinist!

67 gt said

I think it was crank balance to bob weight ! he also mentioned that it was very common in these as he has had some pushing over 35+ grms. This is the set I purchased from summit and I paid extra for the balance job SCA-1-48035BI

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OK, thanks. One thing about determining bobweights.... the fixtures to separate the big and small end rod weights, and the skill of the user, is a potential source of error. Separating the weights properly can be tricky to do, and is critical to getting the right bobweight.

I'd also be curious to know of your machinist (or SCAT) uses a different reciprocating factor for a stroker than the common 50%. Again, just curious... that would change the computed bobweight to which the crank would be balanced.