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I'm gonna give the nod to the LS1, unless were talking about GTO's, LOL. [8D]
I plan on finding out with both. There's a couple stock auto LS1 GTO's around town. And I've been seeing a few LS1 Fbodies too. Don't know their mods though. I just know that the silver 99SS is an auto hardtop with SLP 2OTL exhaust (my mom's cousin owns it).
And if I don't get a chance to run any of them, I'll just try and find a time to race S8ER01Zsometime up at Cordova. But, I don't think I can compete with his bone stock 13.1 time. [&:]