I don't know when they first came out, but the TRW SD pistons were specifically made for the SD, narrower opening for the rod.
They wouldn't work with the stock rods.
I had a set in 77, and they worked great, using the HO setup like Lloyd said.
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John Wallace - johnta1
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KRE's MR-1 - 1st 5 second Pontiac block ever!
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