nick_s

iTrader: (11)

the crank is a 4340 steel unit and its fine, no scoring or anyhting. was using 10w-30 oil, stock powdered metal rods, H bearings. rods #3, 4, 5. any ideas?

slowpoke96z28

iTrader: (2)

how tight are the bearings clearanced?

kossuth

iTrader: (12)

Hmm, that almost looks like the crank isn't true from what I can see in the pics. Might be a good idea to maybe have a shop look at the crank and see if it is indeed off. If it is then maybe polishing it might bring it back. As for clearnances where were your clearances set at?

nick_s

iTrader: (11)

not sure as this was assembled "at the factory" (crate engine)

kossuth

iTrader: (12)

GM crate motor or somebody else??? Eithor way I would be calling the manufacture and work out a warranty return. Big problems in that motor there.

nick_s

iTrader: (11)

gm crate actually. all the mains are good, just 3, 4 and 5 rods look like that.