disadvantages to porting viper?

you use a little more fuel.

wont be a stock sled anymore if you take it to a sactioned race. other than that no, a ported viper with pipes hauls some butt..
 
it will lower your compression as u raising the port window, initially. but easily corrected by milling or swapping head. saw u had a viper compression in another thread, so keep this in mind when doing porting and checking compression.

just make sure u r consistant when checking before and after porting compression.

and yes a ported viper with pipes hauls some butt..
 
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