Now if the KAT can find me a supply of inexpensive rust-free donors, I usher in a new era in ITS up here in the NE!!!
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Gee, I have one of those (rust free donor, '71) that needs a home....

I haven't been paying attention- what's a 260Z weigh now? Things to think about before considering: The L26 was same bore as an L24 but with what eventually became the L28 crank. Torque will be more, but proly at a lower rpm. It's our experience that more useable rpm gives you the ability to gear numerically higher, which is a torque multiplier to the rear wheels- which almost always is faster and more useable than engine torque made lower. I like what 7400 rpm all day long does for us (well, once we figured out how to make the numerically higher diffs last). Doubt you could do that with an L28 crank and cast pistons, maybe with forged. If it was only 50 lbs difference I'd still bet on a 240Z. Yeah, we had a big time engine program but I'd attribute our success to chassis, and weight hurts.