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Old 10-12-2019, 04:40 PM   #9
BIKERMIKEYBLACK
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Yamaha
 
Join Date: Jun 2011
Location: Kingston Springs Tn.
Posts: 874
Default Re: Head porting tools for GX390/Predator420

That’s a great video and exactly wat I did on my hemi head It didn’t need much short side radius and blending in is really all u need on a street type engine (golf cart ) some folks get carried away and remove too much which actually hurts performance at lower rpm
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