To be honest,if i had to buy a crank it would be 3.875 stroke.IF your track is heavy during heat races you can use every ounce of that engine in a 3000lb car.I'll admit,you may not put it the dirt when it slicks off a bunch,but you will like it when you need it.I promise.
BTW. Dart 49cc 215 runner heads with valve relief flat top pistons,and a 9.0 decked block,using 0.41 thick head gaskets,i don't think you will ever have a problem with valve clearance and your compression will be up there.
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