Does the 4.8 rev high in the truck?
I think this is a 2V problem. Not a piston speed problem.
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The LS7 is a 7,011 cc (7.0 L; 427.8 cu in) engine, based on the Gen IV architecture. The block is changed, with sleeved cylinders in an aluminum block with a larger bore 4.125 in (104.8 mm) and longer stroke 4 in (101.6 mm) than the LS2.
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Peak output is 505 bhp (512 PS; 377 kW) at 6300 rpm and 470 lb⋅ft (637 N⋅m) of torque at 4800 rpm with a 7000 rpm redline.[16] During GM's reliability testing of this engine in its prototype phase, the LS7 was remarked to have been repeatedly tested to be 8000 rpm capable, although power was not recorded at that rpm level, due to the constraints of the camshaft's hydraulic lifters and the intake manifold ability to flow required air at that engine speed.
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https://en.m.wikipedia.org/wiki/LS_b...l-block_engine