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Thanks barrrf but I think you misunderstood. i WAS talking about 400 at the crank. 400 at the wheels definitely if not a max effort would definitely be a big effort anyway. Khaos was saying the same thing. Basically we all agree.

sweet...

Thanks man you seem to be a wealth of ls knowledge. Sorry, I should have specified hp at the crank. I know I can't get miracles with just a cam and springs lol. I think I'm convinced, L33 here I come!

So the wiring harness and all accessories, everything the same? Just wana be sure and not cause a bigger problem with the wife's ride. I don't think I see any reason that it still wouldn't still be flex fuel capable....I don't think? Do you? Around here occasionally e85 is cheap enough that...

So you're pretty confident that I won't have any issues and it'll just swap in directly? Plug n play? Well if it works I AM thinking that since it's got those sweet ls6 based heads I'll throw in a bigger cam MAYBE better valve springs get it tuned and run with it. Whadya think?

Ok, my wife's yukon isn't holding oil pressure any more and I've determined with 2nd, 3rd, and 4th opinions, that it's new motortime. It's unfortunate because it's only got 130k on it and is a super clean truck. It's a 2006 1500 4x4 yukon xl with the L59 vin code Z 5.3. My question is if I can...