Certainly are. Don't make the compression too high for the type of gas you are going to run.
Learn how to measure the comm. Often engines are a bit different so a double check is important. If I just skimmed mine to the squish number I wanted the comm got way to high.
read my recent thread might help.
The closing points of the ports are way more important than the fact that the piston doesn't go all the way open. that said it is nice if it does. What I haven't done is tried to raise the barrel & in that case these guys have a better experience of the ride afterwards.
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