Turning down stroker crank

EchoSixMike said

Depends on availability of quality crank grinders in your area. You can have the rod journals offset ground for 4.250 or 4.300 stroke w/2.200 BBC rods. The mains can be ground for 2.625 B block dimensions as well.

It will be less than buying a new crank. S/F....Ken M

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i have heard this, so what defines a good crank grinder vrs everyday dude. got a stroker old school welded up crank that spun #7 and needs turned. was told by my builder its going to be tough to find someone who knows what they doing. special equipment? all in the skill of operator?