The 340 is out....again.....

yellow rose said
The only possible way the oil galleries not being drilled would be if the block always had these issues and the OP bought someone else's problems.

I didn't realize there were two widths of cam bearings. I don't have a durable catalog here but that's all I've ever used and I don't remember two numbers in that catalog.

Without re-iterating a very long story--I had a problem with a 360 and a 340 block in the same timeframe. The mains are drilled but NOT the full diameter so yes the mains received oil but were starved and would wipe the bottom end if 5000+ RPM was approached. The hole in the main saddle will appear correct but I had to take a 9/32" extra long bit and drill 'till I intersected the lifter oil galley. They both took 4 inches yes 4 inches of drilling to correct. I just took this pic of an Early 80's 318 block I have sitting here and as luck would have it--this one will take 2 inches of drilling or more. The flutes on the drill bit almost become flush with the saddle when drilled all the way properly. FWIW the early blocks seem to be the worst with the Magnum's never needing this. If you didn't know this and have never been burned by it then consider yourself very lucky. J.Rob

Oh and DuraBond only lists one cam bearing width set while Clevite offers the two versions. J.Rob