40mm intake question

lots of them have it, probably any 40mm stroke motor will have it - should soon be hard to find the old intakes
 
not sure I'm understanding - over the years, any good change seems to become the new standard pretty quickly - I'd guess that 40mm stroke and 40mm intakes will be all one can find very soon - any cylinder with 40mm intake that has close enough port mapping in terms of timing height should work on 38mm stroke motors (since most 40mm strokers use an extra 1mm gasket at bottom).
 
Yea i havent had any problems on my half-breed 100 miles later i check the cylinder and piston for scratching none smooth as butter. i actually think my engine has more power im glad i went with the 40intake cylinder
 
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