Boring vs Stroker

I have been throwing some ideas in my head about a build that may or may not take place. I saw an lq9 iron block for under 800 brand spankin new on jegs. So i thought, wouldnt it be cool to build an engine from the ground up and put it in my truck. I was thinkin 383 or 408 in displacement but not sure exactly how to get it there. What are the pros and cons of boring v stroking or some good combinations? Goal would be around 600 tq under 4000rpm N/A on 87 for convenience. Is this feasible, I am kind of a :newbie: at this. Thanks

probably not possible. 600 tq is alot, especially with 87. 408 takes a 6.0 block like you saw on Jegs Bored .030 over and a 4'' stroke crank. most 383 kits ive seen use the 5.3 blocks. not positive the stroke and bore. you could do a 500 hp build on 87 octane with a good motor maybe. but if you want that much torque, might want to look at diesel.

383's are 4'' stroke and 3.898 or somewhere around there for bore.. actually I think thats more in the range of 388. Uses the 5.3l block. I researched it a while back, can't remember the exact numbers

You can make a 383 with a 6.0 block as well. Search over on tech

the 383 6.0 is a custom piece

a typical 383 uses a 5.7 to start off with. yes ppl use 5.3 blocks but first bore them to the specs of a 5.7. to achieve a 383 you need a 4" crank 6.125 rods
since you dont start off with a 350 and bore it to 355 youll only get i believe 382. a 355 with conversion is more 385

87 octane you say....so you wnat to skimp on things for a 5 dollar difference between fill ups?

408 with 600 tq isnt happening. THese are LS motors they dont make torque!!!!!!!! to get torque you need boost. Even some of the baddest 408s arent making 525rwtq

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Originally Posted by Quik

408 with 600 tq isnt happening. THese are LS motors they dont make torque!!!!!!!! to get torque you need boost. Even some of the baddest 408s arent making 525rwtq

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Were talking n/a right?

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Originally Posted by Kamikazekyle05

Were talking n/a right?

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yes

So really boring out to 383 would be realistic going for around 450 hp, unless you're boosting?

500 would be fine then. According to the GMPP website, the crate 383 can make 457 at 3400 carb'd. I thought that higher numbers would be easier with a 408. Not trying to skimp out on anything, just thought it would be interesting from an engineering stand point to pull it off with 87. 93 it is then.

If the 408 bore is .030 more than the 6.0, what can be gained/lost from boring it .040 with the same 4" stroke.

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Originally Posted by cjriojas

If the 408 bore is .030 more than the 6.0, what can be gained/lost from boring it .040 with the same 4" stroke.

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figure it out with this
Engine Size and Compression Calculator

6.0 block has a 4.000" bore and the combustion chamber is 72cc's stroker crank is 4.00inches

the biggest I think you you can go with a 6.0 block is 414 which is .060 over with the 4" crank. you could go bigger, but it would be too costly for what you will use it for. if you want a tq monster look into strapping a blower onto an lq4, and the blower setup will cost about the same or less then the stroker package with the cam and heads to support it.

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Originally Posted by cjriojas

500 would be fine then. According to the GMPP website, the crate 383 can make 457 at 3400 carb'd. I thought that higher numbers would be easier with a 408. Not trying to skimp out on anything, just thought it would be interesting from an engineering stand point to pull it off with 87. 93 it is then.

If the 408 bore is .030 more than the 6.0, what can be gained/lost from boring it .040 with the same 4" stroke.

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cant compare apples to monkeys. two different beasts.

So, how would the change in bore affect the engine overall?

as long as you dont go too thin it wont do anything different. if you go too big it will run hot, and you might chance a hole in the cylinder wall if you put no2 on it.

the motor will act the same no matter the bore, some will have more cubes and smaller bores will have less, this equals out to a few ponies, but thats pretty much it.

So really, doing the 383 or 408, would be about the difference between the 4.8 and 5.3. There is a difference, and if you had the choice of the 408 take it, but if you didn't the 383 would be just fine, and actually very equal to the 408. Making sure I'm following.

My 4.8 knocks more than I like now, and looking at going a similar route. Except my 4.8 block checked for boring stroking it to 383. Or get the 6.0 block and going 408.

Is my thinking right with the 383-408 to 4.8-5.3 comparison?

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Originally Posted by mnc2fan

So really, doing the 383 or 408, would be about the difference between the 4.8 and 5.3. There is a difference, and if you had the choice of the 408 take it, but if you didn't the 383 would be just fine, and actually very equal to the 408. Making sure I'm following.

My 4.8 knocks more than I like now, and looking at going a similar route. Except my 4.8 block checked for boring stroking it to 383. Or get the 6.0 block and going 408.

Is my thinking right with the 383-408 to 4.8-5.3 comparison?

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you picked the only motor that wouldn't be the right comaprison...
the 4.8 has a shorter stroke then any of the other ls motors. the 383 to 408 is more along the lines of a 5.3 to 6.0 swap. generally speaking more stroke means more tq. it depends on what your plans are, a 408 is a gas hog from hell, the 383 will be a great engine that could still be driven daily.

are you wanting to build a steet truck, a tow pig, a fun daily, or a stip beast?

tow pig/offroad

okay then a stroker with a mild cam is not a bad plan, but personally I would find an lq4 in good condition and strap a maggi or vortec s/c on it. look into your options, they will cost close to the same. The boosted 364(6.0) will make the same power as the 408, plus you will not need a big stall or extensive internal mods. Really all you would want is a blower cam and large injectors.

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Originally Posted by Lsx10

okay then a stroker with a mild cam is not a bad plan, but personally I would find an lq4 in good condition and strap a maggi or vortec s/c on it. look into your options, they will cost close to the same. The boosted 364(6.0) will make the same power as the 408, plus you will not need a big stall or extensive internal mods. Really all you would want is a blower cam and large injectors.

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Still wanna go N/A but i think you all have put me in the right direction. Thanks