small block HELP...keep spinning the same bearing

[JohnM]

Thanks everyone for the help and info and links.

During the first "build" 7 years ago everything was done. I had 3800 miles of easy driving...but never liked my oil pressure...then the accident, 5 months out of sight in a body shop....who knows

Then the spun connecting rod. During this second rebuild a few weeks back a new crank & bearings....conecting rods checked, sized, shaved etc etc. maybe a few corners cut? thinking it was basicly a fresh motor, throw in a new crank out of the box and new bearings and away we go

Now rebuild #3 after the same connecting rod spun...The builder is doing it all on his dime....I did buy new connecting rods...and I should of done that for the second rebuild.

I think this rebuild will be possibly the best ever!!

If all works out after this...and I think it will....I will still HIGHLY reccomend this engine builder.

If anyone is in the Cleveland area or wants to bring a motor this an this way...pm me direct and I will fill you in.

John

[c6ae]

I have seen rod bearings pounded out from a mix-up of spark plug wires. It is possible to have one cyl running advanced and another running retarded. It may not be noticed by an amateur as the engine could still run fairly well… meaning it won’t backfire etc.
The advanced cyl will hammer out the bearing; the retarded cyl may seize the piston…
On the 351 this seems unlikely but it could be a 1-3 mix-up.