how much hp will a ls3 block handle
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From: South Florida
I know the 4.8/5.3 are supposed to have cylinders thick enough that some have bored them to 4 inches. That's crazy. No wonder they have been over 1k HP with cam and boost.
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Yep very thin between cyls even at std bore. I see .060~.120 between cyls and .200~.225'' on thrust side on Lq4~lq9 blocks 99~2007. All the big power lq4 builds I have seen are filled or partial filled blocks which for a true street drag week guy like me it's not an option. That's one reason I have not forged the lq4 in my car yet. Im afraid as soon as I do that and start making more power it will split. I have a cpl LS2 and a L92/Ls3 block here and they are about same thickness of .170'' at the liner. I don't really see much difference between the Ls2 and Ls3 if anything the LS2 looks a tad stronger at top of cyls. Have a L33 block that sleeve measures over .250'' all around.
Yep very thin between cyls even at std bore. I see .060~.120 between cyls and .200~.225'' on thrust side on Lq4~lq9 blocks 99~2007. All the big power lq4 builds I have seen are filled or partial filled blocks which for a true street drag week guy like me it's not an option. That's one reason I have not forged the lq4 in my car yet. Im afraid as soon as I do that and start making more power it will split. I have a cpl LS2 and a L92/Ls3 block here and they are about same thickness of .170'' at the liner. I don't really see much difference between the Ls2 and Ls3 if anything the LS2 looks a tad stronger at top of cyls. Have a L33 block that sleeve measures over .250'' all around.
yeah I think that qualifies Thread Starter
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well there has been one saying lq blocks have thin walls, now ls3's have thins walls..idk lol.. basically 1k wheel and under is wat im askin for..its notta highway roller or half mile or all out drag.. justa fast street/drag car.. but not setting any records
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I think with good prep, machine work, assembly and tune with stock stroke I would not be too worried around 1000hp. Im stressing and debating between alum and iron block for substantially more power than that. I really don't trust either one too far but aftermarket is not an option for me.
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We have had a LS2 pop a sleeve that was very thin in one area. Right in the 10 o'clock position of the bore where the water jacket resides. Have seen a few other LS2/3 blocks look the same.
My iron block is filled almost to the top and I'm running a stock stroke crank so rod angularity isn't as big of an issue as a 4" crank would have.
I'm not worried about the liner cracking in mine and haven't seen any other iron blocks crack like rotaries did.
I haven't been running my motor long, but it's been 137@3250 in the eighth so far.
My iron block is filled almost to the top and I'm running a stock stroke crank so rod angularity isn't as big of an issue as a 4" crank would have.
I'm not worried about the liner cracking in mine and haven't seen any other iron blocks crack like rotaries did.
I haven't been running my motor long, but it's been 137@3250 in the eighth so far.
I've seen an engine builder install plugs in the corner of the bores where the water jackets are (not blocking them completely.) He said its prevented the bores from flexing up top and created a bridge that added to the "unity" of the block. It made sense to me and apparently there where quite a few of those blocks making huge numbers (1700 plus)
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From: Colorado Springs, Co/ Central, Ca
We have had a LS2 pop a sleeve that was very thin in one area. Right in the 10 o'clock position of the bore where the water jacket resides. Have seen a few other LS2/3 blocks look the same.
My iron block is filled almost to the top and I'm running a stock stroke crank so rod angularity isn't as big of an issue as a 4" crank would have.
I'm not worried about the liner cracking in mine and haven't seen any other iron blocks crack like rotaries did.
I haven't been running my motor long, but it's been 137@3250 in the eighth so far.
My iron block is filled almost to the top and I'm running a stock stroke crank so rod angularity isn't as big of an issue as a 4" crank would have.
I'm not worried about the liner cracking in mine and haven't seen any other iron blocks crack like rotaries did.
I haven't been running my motor long, but it's been 137@3250 in the eighth so far.