People selling 5.3 L as Ls1
#1
People selling 5.3 L as Ls1
I am seeing this around where I live and I am about to start a build. From what I thought I understood the 5.3 L is not a ls1 motor. Am I correct?
#2
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The 4.8/5.3 blocks share the same cathedral style heads as the LS1, LS2 and LS6 all being the Generation III family of LS engines. You can use and iron 4.8/5.3 block and bore/hone to an LS1 5.7 bore and have an iron LS1. Go a step further with a good forged stroker crank, rods and pistons and achieve 383ci. The LS2 and LS6 share the larger 4.00" bores.
#4
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Yes but the most you can go on the 4.8/5.3 or the 5.7 aluminum blocks is a 383. It would really depend on your budget and what your looking to do. Some people are turbo charging those small bore engines and making a ton of power.
#6
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I'd roll the dice on the 5.3 iron over a 5.7 aluminum block any day.
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#8
TECH Resident
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The 4.8/5.3 blocks share the same cathedral style heads as the LS1, LS2 and LS6 all being the Generation III family of LS engines. You can use and iron 4.8/5.3 block and bore/hone to an LS1 5.7 bore and have an iron LS1. Go a step further with a good forged stroker crank, rods and pistons and achieve 383ci. The LS2 and LS6 share the larger 4.00" bores.
Another thing OP, iron LS blocks (regardless of cubic inches) are almost right at 100 lbs more weight than aluminum LS blocks. That's a lot of weight to overcome when talking performance. If you're not going to exceed around 1,000+ hp, try to stick with an aluminum block if it's within budget. Aluminum LS blocks are still very strong and can withstand a lot of power, 800-900hp is perfectly fine for a nicely built aluminum LS block and can last quite some time is taken care of.
#9
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Do some homework and you'll find out the LS EFI isn't all that difficult. Custom tuning takes some time and experience of course. EFI is definitely the way to go, usually. Especially if its a street car/cruiser and mpg & street manners are a concern. Take my old C5 corvette for example which was a 100% street car/cruiser. It was a ~500hp (430whp), stock bottom-end LS1 with ported factory heads and mild-medium sized 227/230 duration cam, among other typical bolt-ons and supporting mods for heads/cam setup. It had the manual 6 speed trans, drove very smooth, excellent street manners and literally got 30-32mpg on the highway.
#10
11 Second Club
iTrader: (3)
I was referring to the LQ block or the 6.0 iron block. I have a 2003 Silverado with the LQ block and have always called it an LS6 but I guess that's not the case.
To the thread starter here, try locating the book How to Build and Modify GM LS-Series Engines by Joseph Potak. That book has a lot of information on choosing the right block and building LS engines.
To the thread starter here, try locating the book How to Build and Modify GM LS-Series Engines by Joseph Potak. That book has a lot of information on choosing the right block and building LS engines.
#11
TECH Senior Member
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I was referring to the LQ block or the 6.0 iron block. I have a 2003 Silverado with the LQ block and have always called it an LS6 but I guess that's not the case.
To the thread starter here, try locating the book How to Build and Modify GM LS-Series Engines by Joseph Potak. That book has a lot of information on choosing the right block and building LS engines.
To the thread starter here, try locating the book How to Build and Modify GM LS-Series Engines by Joseph Potak. That book has a lot of information on choosing the right block and building LS engines.
#13
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Don't fall for the "you want an iron block for turbo" myth. If it's in the budget or you find a good deal, get an aluminum block, 500-600hp is no where near the limits of one. Its just a lot of weight savings. Also both aluminum and iron 5.3L engines can be bored to 3.910", which is 347 cubes. Just a little FYI.
#14
11 Second Club
iTrader: (3)
Don't fall for the "you want an iron block for turbo" myth. If it's in the budget or you find a good deal, get an aluminum block, 500-600hp is no where near the limits of one. Its just a lot of weight savings. Also both aluminum and iron 5.3L engines can be bored to 3.910", which is 347 cubes. Just a little FYI.
#15
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iTrader: (3)
#16
You answered my next question. I have seen that quite a bit through all the reading .
Don't fall for the "you want an iron block for turbo" myth. If it's in the budget or you find a good deal, get an aluminum block, 500-600hp is no where near the limits of one. Its just a lot of weight savings. Also both aluminum and iron 5.3L engines can be bored to 3.910", which is 347 cubes. Just a little FYI.