Carnage. Time for something new
I went 347 and kind of regret it. I mean if your going to be buying rods and pistons might as well get more CI. You can always go 370, and keep stock 6.0 crank just buy nice pistons and rods which is prob a little over 1k.
well i hope you save some money for a new rear end cause unfortunetly launching at that hp level its not going to last. something will probably break the very first run
I have launched low 1.4 60ft's on a stock rear with 3.23 gears but thats with an auto. I would never expect a stick car to do that.
I also look at what gears are in the rear. A 3.23 gear has a thicker ring gear, compared to a 4.10, which help from getting the teeth sheared off when launching hard. Kinda like the deck thickness on a head in a turbo application.
Also, the pinion gear head is bigger letting it mesh better with the ring gear and get more contact area compared to a 4.10 gear.
Last edited by 87silverbullet; Oct 12, 2011 at 10:04 AM.
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That's what i thought originally too. I didn't want that to happen to me. But like what was stated earlier, an average top end on a bigger cube motor won't be that much greater than a good 347 / 383 setup. Plus the added weight on the front. If I wanted bigger cubes I'd want something great.
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I've cut a 1.45 with 3.73's. Only rear suspension being lca / phb. I'm hoping to make my 10bolt last as long as possible. With all my money going on a motor, I wouldn't be able to afford a 12bolt or 9in if something did happen.
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Build your 347 and spray it stock cubes. Or at most build the 6.0 to a 370 ans spray it. No need for the bigger cubes since you have the spray and are on somewhat of a budget.
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i knew id get mixed opinions. the same as every thread ive seen lol. So from a hp standpoint, what are the differences in a 370 and 383? why do guys even go 370 if they can use their block for a 383?? just for the fact they are iron blocks??
370's are alot more common i can tell.
370's are alot more common i can tell.
Last edited by SSmoken; Oct 12, 2011 at 12:49 PM.
i knew id get mixed opinions. the same as every thread ive seen lol. So from a hp standpoint, what are the differences in a 370 and 383? why do guys even go 370 if they can use their block for a 383?? just for the fact they are iron blocks??
370's are alot more common i can tell.
370's are alot more common i can tell.
Most guys go 370 in an iron block is because they can reuse the stock crank and just go with a .030 overbore and put in better rods and pistons. Pretty much the same thing you would do to an ls1 to go 347 but you can't go .030 over in an ls1 block.
To make a 383 in an iron block you would have to use a 3.75 stroke crank in a 4.030 bore block and I haven't seen a 3.75 stroke for an LS yet.
I still say make you a 383 and upgrade the rear next year. Or just fix your ls1 and save your money and build a 4xx cube motor later down the road.
Buying a 6 liter block and crank isn't going to be cheaper than building a 383. Plus your adding weight to the car. If your ls1 block was junk then I could see going 370 but your block is good. I know!
you gain more torque too you gotta remember your putting almost 100 more pounds over the front tires these cars are already tail happy iron block is gonna make it even worse. the only way id go with an iron block is if i was shooting for 800rwhp-1000rwhp where the aluminum blocks cant handle it.
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Alright I've decided to ditch the long block idea. I'm trying to cut weight, so that option is going the opposite direction. More guys have 347's than 383's. My block should be ready to go to the machine shop. I just need to make my decision.