i checked them all with my dad and they were super close this is my first motor and i built it by myself not too many 16yr old kids can say that. well the thing is running great and i am super proud of it now all i have to do is hook up my cooling system. the motor is in a 73 porsche 914 so i had to save up for a while for all that radiator hose to go the the front of the car and back but it is worth it just to pull up next to one of the many mustangs in my town and blow their doors off