I have 2 1973ish JP cylinders side by side and 1 of them has these scallops in the bore just above the intake ports. The other one has the same scallops, only their extended into the beginning of the intake ports. I'm not sure what it all means, or if there is a definate advantage of the ports being extended on that 1 cylinder.
any comments, suggestions ??
Thanks
Raymond
Down East Pentons
400+ Penton enthusiasts on this web site and not 1 of you know anything about the Jackpiner ports ?? cmon, give me a break
Raymond
Down East Pentons
...........the first cylinder is in original piston port configuration,the second had a reed..........