4.125 stroke crank in a 3.9 bore 5.3 block?

Been doing some reading on the subject and was wondering if anyone had any experience with this. From what I've read on ls1tech lots of people love this stroker and lots don't. I kind of like the idea of having almost 400 inches and the block still has 4.8/5.3 stamped on it for everyone to see. I'm not worried about price of machine work because it will all be free and I already have a 2 blocks. Do you guys think the long stroke and small bore would live under boost? Would it be safer to use a 4 inch stroke and make a 383 ?

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Originally Posted by jansen

Been doing some reading on the subject and was wondering if anyone had any experience with this. From what I've read on ls1tech lots of people love this stroker and lots don't. I kind of like the idea of having almost 400 inches and the block still has 4.8/5.3 stamped on it for everyone to see. I'm not worried about price of machine work because it will all be free and I already have a 2 blocks. Do you guys think the long stroke and small bore would live under boost? Would it be safer to use a 4 inch stroke and make a 383 ?

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383

Yes, a couple of these type builds have been done before and work well. I think the main complaint is that the cost vs a 6.0 taken to 402/8/14 is so close that the 383 is much less common. If you can get the machining cost down then it would be a good idea tho the hard internal parts will still cost you a pretty penny. using an iron block I don't see why not. For me I would be much more likely to build a 408, but to each there own and I like the 5.3 stamp idea kinda fun.

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Originally Posted by kerrige

Yes, a couple of these type builds have been done before and work well. I think the main complaint is that the cost vs a 6.0 taken to 402/8/14 is so close that the 383 is much less common. If you can get the machining cost down then it would be a good idea tho the hard internal parts will still cost you a pretty penny. using an iron block I don't see why not. For me I would be much more likely to build a 408, but to each there own and I like the 5.3 stamp idea kinda fun.

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Yup pretty sure I could pass it off as a cammed 4.8 and hussle a few folks lol. 5.3's go for 350 bucks all day long in my town. 6.0's you can add another thousand. I'm not out to be the fastest, just having fun and leaving disgusted looks on peoples face.

A complete 6.0 for sure is pricey, but if your going big cubes a 6.0 block isn't so costly. Your build is awesome though gotta love it.

Might have to get an extra 76mm on 3 to help feed it lol!

Just because you can...don't mean you should.

Strokers make more power but, it comes at the price of long term reliability. Boost + 4" stroke? Man I just do know.....a 4" bore with a 4.8 crank sounds much better to me. Grind the 6.0 off the block, my LS3 heads have been ground down and 241 engraved onto the head ;)

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Originally Posted by LQ9_Z71

383

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Kenneth my friend of many words lol! please elaborate on why you say 383.

Should be pretty cool and sneaky. FYI a brand new 6.0 block is $600 and change

I'd go with small bore long stroke. Less area for the flame to fill on combustion, more mechanical leverage, piston pulls from top dead center faster and cylinder has more time to fill with air/fuel. You will need a good flowing head if you decide to go this route.

Whatever I decide to do I'm gonna top it off with the 853's I ported. Planning on getting an actual boost cam specd for it and a victor Jr intake . This is something I can put together at a budget cost, after all it is a budget build. I've thought about a stroked 6.0 but if I'm gonna spend the money on a 6.0 block I want to put l92 heads on it and a holley intake but My budget is gonna get cut short . Reason for the budget cut is because I've got to upgrade my fuel system, turbo, cold pipes, hot pipes, waste gates, and intercooler . Gonna have lots of stuff for sale in the next few months ha ha .

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Originally Posted by jansen

Whatever I decide to do I'm gonna top it off with the 853's I ported. Planning on getting an actual boost cam specd for it and a victor Jr intake . This is something I can put together at a budget cost, after all it is a budget build. I've thought about a stroked 6.0 but if I'm gonna spend the money on a 6.0 block I want to put l92 heads on it and a holley intake but My budget is gonna get cut short . Reason for the budget cut is because I've got to upgrade my fuel system, turbo, cold pipes, hot pipes, waste gates, and intercooler . Gonna have lots of stuff for sale in the next few months ha ha .

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I have heard terrible things about 853 heads like requiring a graphite gasket and not flowing very well. Of course your port job should help, but with 243/799s coming down in price so dramatically in the last few years I would jump on a set and port them. Seen them go as cheap as $300 even a set of wcch heads are on pt.net for $800 right now. My thought is why spend $3000 on the short block and cheap out on the heads.

If you're going small bore long stroke just keep the stock bore and throw a dragonslayer crankshaft in. 4" stroke is good. I've heard quite a few bad things about more than 4" stroke in the LS motors, even in the lsx block.

What do you guys think about an iron block 383 with twins.... think I could squeeze 800 out of it?

I think you could get 800 out of a large single.

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Originally Posted by bangbangskeetskeet

If you're going small bore long stroke just keep the stock bore and throw a dragonslayer crankshaft in. 4" stroke is good. I've heard quite a few bad things about more than 4" stroke in the LS motors, even in the lsx block.

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U would need new shorter rods with that 4" crank right? What would that be in cubic inches?

383

A 4" stroke in a 3.9" bore is a 383. A 4.125 stroke would make it a 389 I believe, maybe 393. Too lazy to do the math

395..... after further research the 4.125 stroke is not recommended with boost.