The easiest way to tell if it is a big cam for someone who has never seen a big and small cam is to look at the water pump belt. Also see if some one in your area could do a blowby test on the engine, it should only cost you an hours labor and will give a pretty good indication of cylinder condition. Look for oil seepage from the turbo boot and the turbo X-over gasket, indicating a turbo pumping oil. Also look at the area between the cam followers for burnt paint, indicating a spun cam bushing. If it still smokes it could need an overhead set or possibly a camshaft. All the big cams smoked a lot cold, but it should be running pretty clean after coolant temp is 140* or so. ![]() ![]() Look for coolant stains down the side of the block from the head gasket area. Some of them had a problem with the cam followers breaking. They have what is called a thin deck block and were prone to cracking in the liner counter bores and bolt holes, causing coolant leaks at the head gaskets, and it takes major machine work to fix, and then they may still leak. ![]() They had what is called a thin wall cam bushing that was prone to spinning and ruining the block. ![]() I believe a 79 would have a Big cam I 350 if it is the original engine.
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