I have a friend thats a mechanic that says he wants to build my bottom end but im not so sure its a good idea? Is it that hard or should I stop worrying so much?

 

It's not that hard for someone who knows what they're doing. It's expensive and a major hassle to deal with if it gets screwed up, which is why most people are a bit hesitant to tackle it themselves.

It's within the grasp of most people; if you pay someone else to do all the machine work and buy yourself a dial caliper and a torque wrench, and get the on-scene guidance of someone experienced, you could do it yourself and come up with a decent product.

If the guy has built very many motors at all in the professional world, he's probably OK. Screw up a couple of motors that a shop has to warranty and they'll make you into a body man instead of a mechanic real fast.

 

even i can assmeble a bottom end, completes engines on a good day, so if i can any able bodied mechanic should be able to

 

i built my first motor with no experience except for paying attention closely to how i took the motor apart. did it with a haynes manual of all things and it lasted quite a long time revving to 6600rpm quite frequently. just make sure everything is spic and span while putting it together and use a nice clean assembly lube. (i use a mix of NAPA assembly lube and 10/30 motor oil) it makes it thick enough to provide good start-up protection but thin enough as to where it won't stick in small oil passages. (NAPA assembly lube is some really thick stuff)