Description
If you are going with a 180cc (63mm bore) on your QMJ157 GY6, you will need this PROBLD head. This pro head has been cut to match the 63mm bore. Not to mention, the porting is much better. This has the common 54mm stud spacing (GY6 A).
By the way, this is the good stuff! No eBay/Amazon crap 🙂
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