max LS4 bore with stock sleeves
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TECH Apprentice
Joined: May 2010
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max LS4 bore with stock sleeves does anyone know what the max bore with stock sleeves on an LS4 is (FWD 5.3L)?
I was under the assumption that it would be the same as any other Lxx 5.3L, but some others in the LS4 section of the forum have their doubts.
thanks in advance!
I was under the assumption that it would be the same as any other Lxx 5.3L, but some others in the LS4 section of the forum have their doubts.
thanks in advance!
what's inside, just let them find out the hard way, i bet will cost you less, and be a lot faster, with less down time less work, and the end product will put a smile on your face, trust me.
Exterior dimensions aren't the same. There is a big difference in the bellhousing mounting and I think the starter mounting is a lot different also. It would be cheaper to mod the LS4 than change to anything else.
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A RWD LSx would work, because I'm getting the new 6T75 trans which has the "RWD" bolt pattern.
However, I have free machine shop access, as well as engine assembly...but I don't want to take advantage of them and make them resleeve the block if I don't have to I order to get more cubes
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Verdad Gallardo RWD LSx would work, because I'm getting the new 6T75 trans which has the "RWD" bolt pattern.
However, I have free machine shop access, as well as engine assembly...but I don't want to take advantage of them and make them re sleeve the block if I don't have to I order to get more cubes
Good man, so which block will you be using, the LSX block can net you a 440 Ci with the 4" stroke, and with 11 to 1 comp you could be making 600 whp, but require a lot of drive train beef ups, still think a stock LS3 is a viable solution and will still use your drivetrain.....Remember fwd will have lots "less" power loss thrue the drive train, and minus 120 front end lbs, compare to the LSX block, and you'll be saving a lot of money...just beef up the trannie before it goes in so will live, with the extra power, and use headers, and cam if you desire.
However, I have free machine shop access, as well as engine assembly...but I don't want to take advantage of them and make them re sleeve the block if I don't have to I order to get more cubes
Good man, so which block will you be using, the LSX block can net you a 440 Ci with the 4" stroke, and with 11 to 1 comp you could be making 600 whp, but require a lot of drive train beef ups, still think a stock LS3 is a viable solution and will still use your drivetrain.....Remember fwd will have lots "less" power loss thrue the drive train, and minus 120 front end lbs, compare to the LSX block, and you'll be saving a lot of money...just beef up the trannie before it goes in so will live, with the extra power, and use headers, and cam if you desire.
Thread Starter
TECH Apprentice
Joined: May 2010
Posts: 365
Likes: 1
RWD LSx would work, because I'm getting the new 6T75 trans which has the "RWD" bolt pattern.
However, I have free machine shop access, as well as engine assembly...but I don't want to take advantage of them and make them re sleeve the block if I don't have to I order to get more cubes
Good man, so which block will you be using, the LSX block can net you a 440 Ci with the 4" stroke, and with 11 to 1 comp you could be making 600 whp, but require a lot of drive train beef ups, still think a stock LS3 is a viable solution and will still use your drivetrain.....Remember fwd will have lots "less" power loss thrue the drive train, and minus 120 front end lbs, compare to the LSX block, and you'll be saving a lot of money...just beef up the trannie before it goes in so will live, with the extra power, and use headers, and cam if you desire.
However, I have free machine shop access, as well as engine assembly...but I don't want to take advantage of them and make them re sleeve the block if I don't have to I order to get more cubes
Good man, so which block will you be using, the LSX block can net you a 440 Ci with the 4" stroke, and with 11 to 1 comp you could be making 600 whp, but require a lot of drive train beef ups, still think a stock LS3 is a viable solution and will still use your drivetrain.....Remember fwd will have lots "less" power loss thrue the drive train, and minus 120 front end lbs, compare to the LSX block, and you'll be saving a lot of money...just beef up the trannie before it goes in so will live, with the extra power, and use headers, and cam if you desire.
which is plenty for this car. Thanks for the ideas! Cool man, is surely going to be a riot, will be nice if you could have the 3rd gear shift clutches up graded to 6 clutch PAC, before trannie goes in, so you won't have to get back in it later, or just race in drive, instead of over drive, to protect those clutches.
Don't hesitate to PM me if you have any questions, by the way i have a real nice cam for that combo if you need it, will give you a keeler deal..
Don't hesitate to PM me if you have any questions, by the way i have a real nice cam for that combo if you need it, will give you a keeler deal..
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From: Central Cal.
It is NOT doable. The LS4 block is a different animal than the other LS blocks. Shorter, different trans mounting bolt pattern, and completely different accessory mounting.
Plus, the fwd trans is very fragile; barely able to handle the stock 5.3, much less anything more powerful.
Plus, the fwd trans is very fragile; barely able to handle the stock 5.3, much less anything more powerful.
It is NOT doable. The LS4 block is a different animal than the other LS blocks. Shorter, different trans mounting bolt pattern, and completely different accessory mounting.
Plus, the fwd trans is very fragile; barely able to handle the stock 5.3, much less anything more powerful.
Plus, the fwd trans is very fragile; barely able to handle the stock 5.3, much less anything more powerful.
It looks like the OP was under the assumption the 6T75 has the rwd bolt pattern. I'm not familiar with the transmission but was hoping someone had more info on if this is the case.
TECH Senior Member
Joined: Jun 2016
Posts: 22,295
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From: Central Cal.
I have not heard of ANY FWD tranny with the "traditional" RWD Chevy bolt pattern. If that existed, AND it could live with 4-500HP, it would sell like hotcakes! EVERY kitcar would have it! Hey tranny mfrs., ARE YOU LISTENING???
Yep! 