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cowell openings

3DGroove

New to GSN!
Hello,

with the Pilot extra 330 sc 35% the inlet seem kind of thin. some people experience vapor lock and some don't. If i open up the inlets a little and make sure my exit hole is 3 times bigger, is it a good idea also to create an opening in the cowell where the carb is? Also i heard sometimes people make a triangular shape opening (forgot the name) instead of square on front of the carb. Anyone know the difference it makes. Also, is there negative effect if i create a 1/2 inch gap between the prop back plate and cowell? Thanks for your help.
 
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