Rigsby, here is the best part when i took it apart the rods were ground on the cam side to clear the cam lobes (630 roller). I was amazed how long this engine ran. I bought the car turnkey and the man that owned it was in his 70s and had won with this car all over the place. The car was called the "Dirty Bird" out of savannah Ga. All i can say is i know i put around 300 plus passes on it all 1/4 mile, hell i ran every weekend all over the place,Fa.,Ga.,Sc., so i might have put more than that on it and dont know how many was on it when i bought it. I sure know i had alot of fun.