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Generation III Internal Engine
1997-2006 LS1 | LS6
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Old 09-26-2012, 06:50 PM   #1
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Default Question about stroker crank for 5.3

Ive got a 5.3 motor that im looking to stick a few bucks in. I was wondering if anybody knows if a 4.250 stroke crank will fit in a 5.3. It has 2.559 mains and 2.100 pins. Ls1 post and flange.. Any help would be appreciated.
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Old 09-27-2012, 06:58 AM   #2
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I was wondering if anybody knows if a 4.250 stroke crank will fit in a 5.3.
There are none...not unless you re-sleeve the motor with aftermarket sleeves.
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Old 09-27-2012, 11:56 AM   #3
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I really don't see how that would be a good idea. It would cost way too much money to make work, and then I don't see it making good power or lasting for a long time at all. I would look more to a 4.00" stroke if anything.
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Old 09-27-2012, 11:49 PM   #4
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There are 4.250 cranks out there. I make them everyday . Just wasnt sure if it would clear. Im looking to go through my 5.3 and I have a opportunity to get a crank with that stroke very cheap. But I would still like it to be a daily driver, not a race motor. What would be ideal for performance and longevity in this situation? I have a set of 243 heads that are going on along with a 228 cam. Just figure while its down, might as well do the crank. Thanks!

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Old 09-28-2012, 12:13 AM   #5
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It might clear, but the money you save in the crank would be lost in custom pistons, different rods...etc.

Also that crank will not work with stock cylinder lengths. It would pull the pistons down too far in the bore And cause ring sealing issues hardcore.
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Old 09-28-2012, 12:52 AM   #6
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It might clear, but It would pull the pistons down too far in the bore And cause ring sealing issues hardcore.
this^
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Old 09-28-2012, 12:56 AM   #7
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I guess my question is now, what would be the max stroke I could go here? Im looking to be at 450ish at the tires. Doesnt seem to far from reasonable from other builds ive seen on here with similar set ups. Its a DD ext cab 4x4 truck. 3.73 gears, tranny is already built for 500+ horse. Since its a heavy chevy, I figure a little more stroke for torque wouldnt be a bad thing here.
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Old 09-28-2012, 01:18 AM   #8
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I'll have a 4.125" Cola crank for sale soon. Its getting a repair done, it'll be good as new. Perhaps the best crank ever made.......

A 4.250" stroke in those cylinders would be a ticking time bomb, probably don't even make pistons/rods combo that will work. It would drink a quart of oil every 5 miles and the cylinders would be out of round in 100 miles.........LOL

Maybe do a 3.825" Callies crank....390ci. They only cost $660.00.....great deal to have a forged crank good for 1,200 HP. Callies shipped mine out in 7 days, got it last Friday.

.
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Old 09-28-2012, 01:20 AM   #9
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Originally Posted by Lhartsel2189 View Post
I guess my question is now, what would be the max stroke I could go here? Im looking to be at 450ish at the tires. Doesnt seem to far from reasonable from other builds ive seen on here with similar set ups. Its a DD ext cab 4x4 truck. 3.73 gears, tranny is already built for 500+ horse. Since its a heavy chevy, I figure a little more stroke for torque wouldnt be a bad thing here.
You could do a 4.125" x 4.030 bore = 421ci

You'll make well over 500 RWHP easy with just decent and cheap L92 heads and L76 intake.

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Old 09-28-2012, 01:27 AM   #10
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A smaller stroke with the proper size rod fairs a better rod to stroke ratio. It is best to keep it as close to 1.55 as possible for a street motor as you want low rpm torque to move the vehicle. Generally the larger the R:S the higher the RPM peak torque that is produced. The larger R:S will also minimize side wall loading ABDC.

In summary there is more to it than simply stuffing the largest stroker crank you can find into a build. For a street strip application it would behoove you to consider going the opposite direction
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Old 09-28-2012, 04:23 AM   #11
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Originally Posted by LS6427 View Post
I'll have a 4.125" Cola crank for sale soon. Its getting a repair done, it'll be good as new. Perhaps the best crank ever made.......

A 4.250" stroke in those cylinders would be a ticking time bomb, probably don't even make pistons/rods combo that will work. It would drink a quart of oil every 5 miles and the cylinders would be out of round in 100 miles.........LOL

Maybe do a 3.825" Callies crank....390ci. They only cost $660.00.....great deal to have a forged crank good for 1,200 HP. Callies shipped mine out in 7 days, got it last Friday.

.
I probly made your crank then
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Old 09-28-2012, 04:51 AM   #12
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Maybe I could do a 4.030 bore with a 3.750 stroke = 383ci. I just want it to be street friendly (dd), but when im on the highway and wanna play with a mustang or something, id like to give them a show. Also, will my stock fuel system be enough to feed it? I dont know what my limitations are on power before fueling becomes an issue
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Old 09-28-2012, 08:28 AM   #13
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can you bore a 5.3 to 4.030 bore without sleeving it
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Old 09-28-2012, 08:31 AM   #14
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you can bore it to a stock ls1 bore run a 4in stroke and have a 383 very common set up pistons are availably everywhere and 5.3 are safe to bore to ls1 3.9 bore
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Old 09-28-2012, 10:17 AM   #15
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Quote:
Originally Posted by LS6427 View Post
I'll have a 4.125" Cola crank for sale soon. Its getting a repair done, it'll be good as new. Perhaps the best crank ever made.......

A 4.250" stroke in those cylinders would be a ticking time bomb, probably don't even make pistons/rods combo that will work. It would drink a quart of oil every 5 miles and the cylinders would be out of round in 100 miles.........LOL

Maybe do a 3.825" Callies crank....390ci. They only cost $660.00.....great deal to have a forged crank good for 1,200 HP. Callies shipped mine out in 7 days, got it last Friday.

.
PM me the details on that 4.125" crank. I may want it for my 5.3l block.
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Old 09-28-2012, 04:21 PM   #16
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You can't bore a 5.3l block to 4.030". You can build a 383 doing a 3.903" bore with a 4.00" stroke. Any longer stroke then that and you are bringing longevity in question on a block like that.
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Old 09-28-2012, 08:35 PM   #17
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you can use a lq4 ,lq9 block for a bigger bore.
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Old 09-29-2012, 11:09 PM   #18
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Hmm. Sounds like this might be more headache than what its worth to stroke it.. Unless I increase the stroke to only put me
in the 360ci range. And since I already have a block, I dont wanna spend anymore than id have to. Is 450 @ the wheels still reasonable without going big cubed?
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Old 09-29-2012, 11:09 PM
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