roadrashracing
Well-Known Member
As anyone tried them side by side, nothing wrong with my two bolt. I was wondering if there is any performance increase with the four bolt?
Any performance difference between 2 bolt and 4 bolt 30.5
- Thread starter roadrashracing
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, and others.
links, including eBay, Amazon, and others.
rcspeedmart
Well-Known Member
not a performance difference more of a reliable issue have 4 bolts to hold the head verses 2 bolts to hold the head.
Revolauncher
Well-Known Member
On some of the newer 30.5cc, 4 bolts, the intake and exhaust ports are opened up better and match the flanges size and shape for better flow. I'm not sure when the change took place though, or which manufacturer spec's it, so it would be a case by case comparison if you ask me...