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Message: <blockquote data-quote="01SportChic" data-source="post: 216994" data-attributes="member: 9994">as Magic said, all you need to do is get the crank shaved/polished and get rods and pistons. everything else is strong enough to hold up to like 1k hp. I would just say that I would update all my vacuume lines and whatnot if I went to say 500hp+. Nice little story : My x had a 74mm on his stock engine, just a polished crank, rods and pistons. Well, while racing one night a vacuume line blew off and he heard major detonation. After that there was a tiny tapping coming from the motor, but the car was running fine so he left it. Well 9 months later he decided to go twin and after he finished the kit, the tapping got a little worse, so he decided to 'freshen up' the motor. Well ends up he basically destroyed his #2 piston from detonation, and the skirts to all the pistons were shrunk. Also, he blew his head gasket between 1 and 2, 2 and 3, and 2 and the waterjacket.</blockquote>