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Bolts

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Joined
Jan 22, 2009
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Hi
I have a factory enginemount and spools for a IO-360 engine.According to the manual the engine spool/mount bolts should be reamed to 7/16.What is the benefit of this and what kind of equipment do I need to buy?
My spools and enginemount have 3/8 holes, but I am having some troubles to find the correct bolts and length. AN or NAS?
Probably a basic question, but I am about to pull out all my hair because of this ;-)
Thanks for all help





 

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