Atlantian
5+ Year Contributor
- 38
- 4
- Jan 13, 2018
-
Erie,
Colorado
Thank you for the info!4g has 85mm bore
420a has 87.5 bore
4g is better
if i were you, i would be comparing 6 bolt 4g63 to 7 bolt 4g63
here this might help you out with that
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