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rebuilding 1996 Polaris XCR600sp and was wondering if Arrow on top of piston faces towards front of sled?

Also, paper work with pistons saysd to drill holes if engine has exhaust bridges. What are exhaust bridges and how dpo I tell if I need to drill these holes?
 

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1. Piston arrow points the flow of mixture through motor. Arrow should point toward exhaust port...

2. I Can't help you with that one, I read that, but didn't need to on my motor....

-Dean
 

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I beleive if you look at the exhuast ports and there is a cast bridge in middle then you
need to drill, if it's wide open you would be all set
 
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