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

crackedback said

Cam bores in block are not straight is my guess. Pretty common on SB Mopars.

Heads won't have squat to do with the cam bearing issue. It's poorly assembled and not paying attention to the cam fit. Whether the builder know that or not, it's on them if it's two strikes.

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There is nothing special or trick to building a Chrysler. Straight is straight and round is round. Whoever is working on it needs to stop and take a breath and look at what's going on. It ain't that hard. If nothing else, get a factory service manual and look at what the factory specs are.

I hate to see this happen. People think because it's a Chrysler it's some voodoo bullshit and it ain't. The oil goes from the pickup, to the pump, out to the filter, back into the block, turns vertical and goes up to the passenger side lifter gallery, turns horizontal and runs to the front of the block. The mains feed from drilled passages up from the main bearings. From the mains the oil goes out to the rods. Also, the number 2 and 4 main bearings have vertical holes drilled up to the cam line. There is a hole drilled from the deck down to the cam bearing. There are two holes in the cam journal of number 2 and 4. When the holes in the cam line up with the hole that comes up from the mains and the hole drilled down from the deck, you get oil to the rockers. Chrysler designed the system to limit oil as RPM goes up the time the feed holes are lined up is less and less oil goes to the rockers.

I mention all this because the oil system is really simple. It's not complicated. It only has issues when someone who doesn't get it starts dicking with it, or you start spinning high RPM's. The oil timing to the rods bearings is not where it should be. This is why full groove mains are essential to a performance build. Any time you can get oil to the rods you are helping them. For high RPM use, you have to correct the oil timing to the rods.