Originally posted by tooltime
350-2bolt uses small balancer
350-4bolt uses big balancer
What,if it has two bolt mains or 4- bolt mains has nothing to do with the size of the balancer.Be carefull,the 400 also has a 8 in. dia. balancer which is an external balance.The 400 balancer has an extra weight on the inside of the balance.You will also notice that some of the smaller dia. balancers are much thinner found on 283 and 327 small journal and the balancer used on a 305 is much thicker.