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To make a long story short I screwed up when I cut the base. Took too much off and had to change gaskets which is why the exhaust came up long . Had I raised the ex back up to stock or even taken another two off it would have jacked the rpms a tad .How much I don't know . You have to remember...

I don't actually think I gained any rpm's on the 38 mag because the exhaust was acually longer than stock . Stock was 99 degrees and as it is now 102 It however has tons of torgue for 72 ccs and actually cut faster in 10 by 10's than the 066 and 2100 Huskey I ran the same wood at the Ohio...

There are several things which will determine what speed the engine runs at .Porting ,carboration ,ignition timing ,exhaust . Where ever it runs ,barking [4 cycling ] is where it runs . The speed in the air is just noise,doesn't really mean a lot ,it's what it does in the wood that counts ...

Usually I'm wearing the aluminum .Might start a new fashion trend .Stranger things have happened .

I think a few might weigh a piston just for a reference .I can't think of any other reason . If you cut a pop up or do some flow work on the windows you will cut some weight but by how much I'm clueless .