Do I need to get any machine work done by a shop if I want to change out the OEM rods/pistons for forged manley rods and diamond pistons? It is a brand new shortblock, never run. Just wondering..

 

The rotating assembly will need balancing. If there is not still a visible crosshatch on the cylinder walls, it will need a light hone. You might even get away with the same rings, but if it has been run at all use new one. If not, be sure the gaps are right and put them back in the same hole (assuming they fit the new pistons, you will need to pistons with the same size ring grooves) Be sure all bearings go back where they came from. The piston diameter needs to be checked for proper piston to bore clearance, if your new pistons are too small, you will be screwed, if too big it will need to be bored. I would get a 10 over piston and have it bored and honed to fit.

Rich

 

its a brand new short block.

 

If it was started for testing then it still needs a hone to get the new rings to seat, unless you can reuse the original rings with the new pistons and put them in the same holes.

Rich

 

I'm not sure if GM ever started it way back when? do they usually assemble short blocks and start each and every one of them?

 

Just curious: is it a 4-bolt main? All replacement short blocks were 4-bolts.

 

I would sell or save the new stock short block, and build a used one.

 

How would you go about starting a short block?

 

Get a midget to do it!

Honestly, you are putting some nice parts into it - I wouldn't go with the production tolerances, I would have it blueprinted.

 

I'll just forget about changing the internals then. Going to put an AI 200CC heads/cam package on it though. Should be fine right ?

I was originally going to do a Forged 383 but the way i wanted it was going to be around $8500, and i am buying a $35000 C6 so i dont think its a good idea right now

 

As long as the cam isn't too wild. You need better stuff to rev higher for a high duration cam and the static compression needs to match - tougher bearings and better rod bolts at least - maybe oil pump drive. See where that cam makes it's power, then see if you are alright with your components that you have.