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Message: [QUOTE="76GMC1500, post: 1172289, member: 73139"] If you really want to get specific, your crankshaft webs are too thick. You need to build in some flexibility in order to reduce main bearing loads. But, that's beside the point. Also, I've seen a many engines with 4 bolts holding the connecting rod together. They're just big engines (in the 9 inch bore x 14 inch stroke range). Maybe this is a really big engine? On a straight 6, cylinders 1 and 6, 2 and 5, and 3 and 4 are always firing pairs. That means both pistons in the pair will be at the top of the cylinder at the same time, but be 360 degrees out of phase as in one will be firing while the other is between the exhaust and intake stroke (360 degrees out of phase). The firing order of an inline 6 is always 1-5-3-6-2-4. To help you remember, that's too young (15), too old (36), just right (24). [/QUOTE]