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Message: <blockquote data-quote="INW-Iron-Steel" data-source="post: 27638" data-attributes="member: 11733">Yes, 4.8 has the 3.268 stroke with longer rods. Piston compression height is the same, and the 5.3/5.7/6.0 all shared the same crank and rods.One of these LS rebuilds is intended for my 93 k1500 Suburban with a first gen 4l60. I have it, that is why I would want to use it. On the other hand, my 04 Sierra has a built 4l60 with 30K on the rebuild. I am not very interested in swapping to a 4l80 at the moment. That would include getting another new transfer case, and my LD 261 is also only 3 years old. The whole objective here would be keeping the cost down using parts I already have and limiting buying new expensive new pieces (transmission). Doing a 6.0 in the Sierra and a 5.3 in the Suburban would require buying two new engines, or an engine and a rotating assembly. I already have two 4.8s, so I would be cutting out the cost of an extra engine and associated crank/pistons/rods. Also, 01+ 6.0s are stupid expensive now. $2000 plus for a 250K mile long block around here. Early 6.0s are going for half that with half the mileage. I've crunched some numbers, here are my thoughts:04 Sierra: 6.0 block, 4.8 crank, factory dish 6.0 pistons, 243 heads, and a mild truck cam of some sort. Based on my calculations, should yield 9.2:1 or so compression depending on head gaskets.93 Burb: 4.8/5.3 block, 6.0 long crank, 4.8 flat top pistons, 317 heads, torque cam or something like the Melling MTC-7. Again, 9.2:1 depending on head gasket. From what I understand, this will bolt directly to the SBC style transmissions using the flat style flex plate from the 6.0?Neither one of these will be fire breathing race motors. I fully intend to run them on 87 octane, which is why I am intentionally wanting to keep CR under 10:1. Premium is close to $5.00 a gallon here, and I don't have that kind of money to be running 93 in the daily rigs. I appreciate your input!</blockquote>