Anyoen can build a motor with a helms manual, but getting the right bearing clearances on the rods an mains for the type of motor you are building is an industry secret.

The big guys like Jim, Don, Skunk, IPS, Inline pRo, Abacus, RLZ , etc have blown up enough motors or built enough to know that 3 though tighter on the mains gains 7whp on an NA motor, but decreases longevity or life of the motor. oops , i said too much

but yes, there is no shame in having a PROFESIONAL build your race motor, whether its peter, dfe, justice race engines, mspi, rlz, benson, GE, etc.

some shops SPECIALIZE in race motors, we usually build any motor under 600whp, anything over that we leave to others that can handle those kind of motors and have tons of experience with that kind of motor. we build mostly street cars.

thats why i laugh everytime i hear someone bitch about ACL bearings. about how they are only greens an you need to color code them to have the right "built motor". that person knows nothing about BUILDING a motor.