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which motor should i buil 346ls1 or 370 6.0

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Old 12-10-2008, 06:58 PM
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Default which motor should i buil 346ls1 or 370 6.0

i want to make descent power but i dont want the hassle of having to remount my accesories and **** w/ that. thats why im kinda of leaning away from the 370 6.0. I can find an ls1 block and build that for fairly cheap im guessing and make close to 500 rwhp. i know i can make crazy power out of the 370 too. which one do you guys think would be a better choice?
Old 12-10-2008, 07:23 PM
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Just wondering if your current accessories will bolt onto the LQ4 motor?
Old 12-10-2008, 07:24 PM
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You wont have to remount any accessories with the 370. But will that extra 25ci make up for the ~95lbs added to the front of the car.
Old 12-10-2008, 07:26 PM
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If you want close to 500RWHP go with the 370, its easier to hit 500 that way. Like was said though, you will have some added weight.
Old 12-10-2008, 07:30 PM
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i guess im looking for the easiest meathod. if i make 480 rwhp and have 70lbs less weight on the front of the car its kind of a wash if im making 530 w/ the extra weight. Im sure i can find an ls1 block or shortblock for pretty cheap. the machine work wont cost me much eaither.
i just want to basically swap motors and not have to **** around w/ anything...

i would probably be putting something along the lines of an ms4, t-rex, or polluter in the new motor...
Old 12-10-2008, 07:40 PM
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your going to have more tq with the bigger cubes ...and tq is more important than hp from the dig ...500 is tough on a 346 and keeping it streetable ..if you go with a 402 ci with the 6.0 block with the right setup through a t56 you'll be in the 500 rwhp and 460-470 rwtq .
thats what i did ,you get big heads and cam (bigger than a ms4 ) you'll be in the mid 500's

so yes its worth it to go a little bigger
Old 12-10-2008, 08:13 PM
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how hard is the swap itself? not everything bolts up perfectly, at least thats what i was told.
Old 12-10-2008, 08:39 PM
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I think there are one or two accessorie holes you have to drill & tap on the LQ but no biggie.

I just don't want the extra weight of a iron block for handling reasons so I will go 383 or 402 when I need a build.
Old 12-10-2008, 10:43 PM
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you have a better head selection with the 370. about the same cost to build it also
Old 12-10-2008, 11:31 PM
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Depends on what you future plans for your car are. If you use the car mostly for a street strip toy and want to add some nitrous I would go with an LQ4 370. If your worried about handling and the extra 70 lbs and really don't plan on getting serious with nitrous stay with the LS1. You will have a lot more choice with the heads on the 370 if you decide to up grade in the future. The differences in the accessories is like one bolt hole and when most people do the lq4 swap they don't even worry about drilling that hole. Other than that it is an exact swap. We did the lq4 swap on my last camaro and when I get ready to build a motor for this camaro I will do the same thing. It will be either a 370 or I will step up a little and do the 408.
If you plan on making 500 rwhp N.A. on a 346 it going to be hard to do. You might want to shoot for around 450-460 rwhp.
Old 12-11-2008, 03:36 PM
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Go with the 370, it only requires one boss to be drilled out and tapped. And even that is debateable. The extra weight is not a penalty if you select the right parts. My LQ4 swap had the exact same ET and Trap speed as my LS1 did one month earlier, but with less CR.
Old 12-11-2008, 11:12 PM
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my lil 346 did 490 rwhp 445 rwtq. The other 10 rwhp could've been had by bumping the compression a bit more. However I didn't want to take any chances with detonating some 93 octane fuel that wasn't up to par so to speak. Some stations around here don't have "good" 93 octane gas. Thats why I stick with Mobil, Amoco, or Shell. None of the "el cheapo" stations like Valero or Firebird.




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