You should see what holds the crank in on a K series Sam, then you'll understand :p
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13:5 is ok for track/drag motor with extensive tuning and good fuel (Jungle juice E85).
getting back to the OP... i dont understand the point of the question!
why do you need to ask if it would be ok to drive on the street?
as long as it's tuned well, is not too low, is not too loud and doesn't have some mofo clutch... don't see what the question has to do with engine parts! [/rant]