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The overall length of the piston/rod on a 360 is longer than on a 390...the 360 pistons would stick out of the block if you just swapped in the 390 crankshaft. You can use the 360 pistons OR the 360 rods in a 390, but not both. (That's how 360's were built...using the 390 piston. The compression height of the 390 4V pistons with the long 352 rods and 3.50 stroke crank made 8.2:1, 390's used the 410 4V pistons to bring it down to 8.4:1.) The compression height of the 360 pistons is 1.776", which makes the perfect 390 piston. The 360 long rod is .052" longer than the 390 short rod, which combined with 1.680" compression height 390 truck pistons would also give good compression. However, the 360 rods are somewhat weaker than the 390 rods.

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