small block HELP...keep spinning the same bearing

[JohnM]

Hello All

Here is the background...351W 69 block, so the short deck height. I purchased it as junk yard moter 7 years ago. The engine was already 40 over and took it 60 over. Had it rebuilt nothing to radical all good quality stuff...but never was happy with my oil pressure and figured it was rebuilt loose...maybe not the best engine builder but no problems...ran strong etc

Finished the car and have been driving if for 5 years...only 3800 miles on the car.

Got into an accident late last year 2007 not my fault...mostly fiberglass damage etc...car was repaired and finished this spring. Drove it this summer...came up with an engine knock, pulled the pan and I had spun a connecting rod bearing.

This time took it to a race engine builder....new crank reconditioned the rods...line honed the block, kept the cam, redid the heads...he says he went all through it.

Started it up and broke it in...no problems lots of oil pressure. Changed the oil fired it up the next day to finish setting the rings...came up with a knock...pulled the pan and had spun the same connecting rod bearing...?? The new crank is fine, engine ran for maybe 60 minutes total

Never lost oil pressure

The question is...what do I look for?? Obviously new connecting rods will be installed...but what else should be looked at?

what our we missing?

any help and advice would be greatly appreciated

thanks

John