So there's really no on in here that can help an LS4 guy?
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TECH Apprentice
Joined: May 2010
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So there's really no on in here that can help an LS4 guy? I made a post about 2 weeks back asking for the max bore possible on the stock sleeves in an LS4, the FWD 5.3L V8. Id appreciate any help I can get! And I mean c'mon enough already with not counting the LS4 cars as real GM muscle, if you were going to have a FWD car wouldn't you want it to have the latest small block Chevy?
I would say possibly .010-.015 max from hone.
Is the motor damaged? Or just looking for more hp?
Remote mount turbo is what i would go for if i owned one of those cars and looking for more hp.
Is the motor damaged? Or just looking for more hp?
Remote mount turbo is what i would go for if i owned one of those cars and looking for more hp.
Well actually no, id save my pennies and get the RWD v8. Not the wrong wheel drive truck v8 :p
No idea on max bore though. If you're going that far you might as well just get a short block
No idea on max bore though. If you're going that far you might as well just get a short block
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no damage, always in the pursuit of more power!
There is a turbo kit that promises 505 fwhp, up from 303 at the flywheel...but its 5 grand and thats WAY too much power for a wrong wheel drive street car.
I also looked into an STS universal kit, but again no thanks...
I have an engine shop that owes me a free build...so my plan was to bore out to LS1/6 spec and essentially have an LS6 (LS4's have 243 heads) throw a cam at it and be done with 450 hp easy...but then I come to find that the LS4 cannot be bored out the same as the truck 5.3's, which based on your knowledge is confirmed...looks like I'll be resleeving
I don't wanna have a custom crank made to get extra inches, just wanna bore...what's the biggest I can go as far as bore and displacment? can I go as big as 4.125 to give me 387ci? (resleeved) will that require new rods too?
big thanks to NemeSS for being first to help the less respected of the current SBC community
There is a turbo kit that promises 505 fwhp, up from 303 at the flywheel...but its 5 grand and thats WAY too much power for a wrong wheel drive street car.
I also looked into an STS universal kit, but again no thanks...
I have an engine shop that owes me a free build...so my plan was to bore out to LS1/6 spec and essentially have an LS6 (LS4's have 243 heads) throw a cam at it and be done with 450 hp easy...but then I come to find that the LS4 cannot be bored out the same as the truck 5.3's, which based on your knowledge is confirmed...looks like I'll be resleeving
I don't wanna have a custom crank made to get extra inches, just wanna bore...what's the biggest I can go as far as bore and displacment? can I go as big as 4.125 to give me 387ci? (resleeved) will that require new rods too?
big thanks to NemeSS for being first to help the less respected of the current SBC community
Last edited by V8ImpSS; Mar 8, 2012 at 09:59 PM.
Thread Starter
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there's nowhere to buy an already built short block from either, has to be my engine unless I wanna buy a core which I don't, but that's not an issue because my trans is about to shatter anyways, and it's getting a newer model 6T75 all beefed up regardless of how far I go beyond a cam with this engine...really want more cubes
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How much power do you plan to make? Im around 450 (crank) 370fwhp with cam, ported heads/intake, 10.5 cr and headers. You can use the tfs 5.3 head and cam package with a ls6 intake and headers. There was a member who made 495 crank hp with the tfs heads 222* tfs cam with the mods listed above. This was dyno'd with open headers and electric water pump only. (max effort run)
If the shop owes you a build then have them sonic test the bores to see how far you can go. GM sells .5mm over sized pistons. Trw sells pistons that are much bigger.
My cars power is very hard to control without the anti score kicking in and killing power.
If the shop owes you a build then have them sonic test the bores to see how far you can go. GM sells .5mm over sized pistons. Trw sells pistons that are much bigger.
My cars power is very hard to control without the anti score kicking in and killing power.
Last edited by DavidGXP; Mar 9, 2012 at 06:41 PM.
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Verdad Gallardo You could always use a 6.0l block with the ls4 crank and accessories. You would need to use an adapter plate on the bellhousing. I would have the bellhousing milled down and weld on the adapter plate.
Teching In
Joined: Mar 2012
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I am wondering if that is a maximum bore point to fit the stock 3.898s or can you go to the 3.903 or 3.910 with these sleeves. with a sonic test to make sure they're centered of course, cause a cast in sleeve could definitely be shifted. I would like to know if the 5.3 aluminum castings use the same molds as 5.7s. If so, a 4.2 sleeve is an option.
He's gonna spend way more on a built sleeved ls4 regardless if shop owes him. Than 5000$.
Build a remote mount diy turbo system. No need for sts. Source all the parts yourself. Save cash by installing fabricating by self.
Upgrade fuel system, tune. More Hp than will ever be able to use.
The h/c guy mentioned his car hard to control with so much power. Turbo will make more.
Build a remote mount diy turbo system. No need for sts. Source all the parts yourself. Save cash by installing fabricating by self.
Upgrade fuel system, tune. More Hp than will ever be able to use.
The h/c guy mentioned his car hard to control with so much power. Turbo will make more.
Thread Starter
TECH Apprentice
Joined: May 2010
Posts: 365
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How much power do you plan to make? Im around 450 (crank) 370fwhp with cam, ported heads/intake, 10.5 cr and headers. You can use the tfs 5.3 head and cam package with a ls6 intake and headers. There was a member who made 495 crank hp with the tfs heads 222* tfs cam with the mods listed above. This was dyno'd with open headers and electric water pump only. (max effort run)
If the shop owes you a build then have them sonic test the bores to see how far you can go. GM sells .5mm over sized pistons. Trw sells pistons that are much bigger.
My cars power is very hard to control without the anti score kicking in and killing power.
If the shop owes you a build then have them sonic test the bores to see how far you can go. GM sells .5mm over sized pistons. Trw sells pistons that are much bigger.
My cars power is very hard to control without the anti score kicking in and killing power.
all I want is to be able to take a stock RWD LS or Hemi powered car on the highway...I already kill 4.6 mustangs
He's gonna spend way more on a built sleeved ls4 regardless if shop owes him. Than 5000$.
Build a remote mount diy turbo system. No need for sts. Source all the parts yourself. Save cash by installing fabricating by self.
Upgrade fuel system, tune. More Hp than will ever be able to use.
The h/c guy mentioned his car hard to control with so much power. Turbo will make more.
Build a remote mount diy turbo system. No need for sts. Source all the parts yourself. Save cash by installing fabricating by self.
Upgrade fuel system, tune. More Hp than will ever be able to use.
The h/c guy mentioned his car hard to control with so much power. Turbo will make more.
If I had a dollar for everytime someone said that to me I could go buy a G8 and pay cash.
but believe it or not I own this car because I like it...imagine that...plus I already have other RWD cars to play with and pontiacs are ugly
Last edited by V8ImpSS; Mar 11, 2012 at 08:34 PM.
Thread Starter
TECH Apprentice
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Say I resleeved the motor...what's the biggest bore I can go? Could I do 4.125 like an LS7 to give me 387ci with the stock crank. Does that much of an overbore require different rods? Would stock LS7 pistons work?
Or if I wanted to swap out the block, could I use an LS3 then put the LS4 rotating assembly in it? Or is the LS2 my only option?
Or if I wanted to swap out the block, could I use an LS3 then put the LS4 rotating assembly in it? Or is the LS2 my only option?
FormerVendor
Joined: Nov 2001
Posts: 3,065
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From: Houston, Tx.
Most aluminum 4.8/5.3s and irons can be bored to 3.900 actually. The other larger bore blocks (5.7/6.0/6.2/7.0) can't be bored that much over but most 4.8/5.3s can. We have done about 30 in the last several years all with no problems. They have a way thicker liner or another words are like a 5.7 with a way thicker sleeve that is only bored out to 3.780. If you have the heads off you can see this pretty easily. All the Aluminum 4.8/5.3 blocks we have seen are like this. We have one here now and it's like this as well.
The ls4 block is not shorter. I wouldnt bother with sleeving. Do a rear mount turbo, or stab in a cam with a LS6 intake.
You can PM me for details to aviod negitive comments. You gotta take back the ugly Pontiac comment though... Lol
This car should trap 114-115 this year, and Im hoping for 1.8 60ft times (fingers crossed!) 3865 lb race weight and all motor!
Shifts are set at 6800 with 3.69 gears and 3500 stall.
You can PM me for details to aviod negitive comments. You gotta take back the ugly Pontiac comment though... Lol
This car should trap 114-115 this year, and Im hoping for 1.8 60ft times (fingers crossed!) 3865 lb race weight and all motor!
Shifts are set at 6800 with 3.69 gears and 3500 stall.
