hemichuck said

They did make a few magnums that oiled both ways, I had a couple of 92 and 93 models that had the oil hole for the LA heads.

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magnummopar said

By early blocks, they are referring to the roller cam throttle body truck engines 88-91 I think. They may have put them is a few z body cars as well but not sure as I have no love or use for them. These had small heads that I think were pedestal rocker but not too sure. Block is somewhat desirable to LA guys because they can use LA heads but get roller and better pistons.

It would only have the oil hole if it was a TB engine. never seen a mpfi magnum with oil hole. If you want to check, put an LA head gasket on the Mag block and look at the oil passage hole in gasket....no hole, dont use LA heads. You will also need a custom length pushrod if you do use them.

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67Dart273 said

Yeah, you are probably referring to what we call an "LA roller" block. These were before magnums, but had factory roller cams. they have the tapped holes in the valley for the roller lifters. I have one of these, it came with an interesting timing cover.....looks just like an LA, with V belts, but the fuel pump mount is still there but has a factory "plug" in the hole. It appears you could cut the plug out, tap the mounting holes and use the cover for a pump

So LA roller block has roller lifters, but still has the oil hole up through the block. If in doubt you can stick a thin rod (coat hanger etc) down the hole and it should come out the cam bearing

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