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Old 08-07-2013, 07:19 PM   #1
ddck24
 
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LsX build

Wanting to get a new bottom end underway to handle even more power...
Am wanting to pull the trigger on a LsX block
Part number 19260095.. This shows it to be a complete finished block.
Says fully machined, bored, honed.. (4.065 bore)
Thoughts are to do a fully forged 3.622" (376) or 4.00" stroke (416ci) rotating assembly in this block..
Any one have experience with these lsx's??
Any thing you have to do to it before you can start assembling?
Any extra parts you have to purchase? Cam bearings, covers?
Will be swapping over the ls3 goodies on to it..
Thanks guys.
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Old 08-07-2013, 07:37 PM   #2
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Buy it bare and the. Have a machine shop do all the work on it. Everything needs to be balanced before assembly too. What internals?
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Old 08-07-2013, 07:44 PM   #3
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This part number is the block they use for the 376 (4.065) crate motor, shows that it's 100% finished!! Which would be sweet. The non finished blocks are the same price. Which would make no sense if I wanted a 4.065 bore anyways.. That's what caught my eye, no machine work!! Start bolting things up! Just going to see if anyone had any more knowledge about this "finished" block.. Don't want to spend 2,500 on a block and then it shows up and have to do a bunch of work on a "finished" block. Lol
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Old 08-07-2013, 07:45 PM   #4
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I'd just buy a built shortblock from TSP.
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Old 08-07-2013, 07:48 PM   #5
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Quote:
Originally Posted by ddck24 View Post
This part number is the block they use for the 376 (4.065) crate motor, shows that it's 100% finished!! Which would be sweet. The non finished blocks are the same price. Which would make no sense if I wanted a 4.065 bore anyways.. That's what caught my eye, no machine work!! Start bolting things up! Just going to see if anyone had any more knowledge about this "finished" block.. Don't want to spend 2,500 on a block and then it shows up and have to do a bunch of work on a "finished" block. Lol
They're not fully finished. They need to be bored again with simulated heads on. The pressure of the heads clamping down will move the bores, so they need to be done again. GM doesn't do it this way, but it's the right way of doing things. The marines need to be line bored too. Nothing can just be bolted in, you need to take it to a machine shop and have everything balanced, even if you just pulled it out of a motor. You'll need new rings too.

Again, what internals are you using? Stuff you have or need to buy?
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Old 08-07-2013, 07:52 PM   #6
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Will buy all new internals for build.
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Old 08-07-2013, 07:54 PM   #7
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Not trying to offend you here, but have you done this before? Just checking so I can give you the right advice without overwhelming you with information.
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Old 08-07-2013, 07:59 PM   #8
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I'd just buy a built shortblock from TSP.
What he said. You can get a built SB starting around 5500.00
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Old 08-07-2013, 08:00 PM   #9
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LsX block I believe is a lot higher
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Old 08-07-2013, 08:07 PM   #10
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You keeping the LS3 heads? And what kind of power adder?
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Old 08-07-2013, 08:32 PM   #11
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Yes ls3 heads with ecs kit
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Old 08-07-2013, 09:09 PM   #12
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No need for an LSX then, only needed after 1k wheel.
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Old 08-07-2013, 09:40 PM   #13
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And cheaping out on skipping a little machine work that will probably still be needed when building a $6k+ short block isn't the best idea. All the machining will have to be checked and cleaned up anyways.
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Old 08-07-2013, 10:20 PM   #14
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LsX block I believe is a lot higher
Think the LsX block is 1000.00 more then the LS3.
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Old 08-08-2013, 12:02 AM   #15
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And cheaping out on skipping a little machine work that will probably still be needed when building a $6k+ short block isn't the best idea. All the machining will have to be checked and cleaned up anyways.


When you're talking 15 to 20 grand long blocks, a thousand in machine work is nothing. Find a machine shop near you that specializes in racing engines or have a trusted shop build one and ship it to you. It kinda sounds like this might be your first engine build, so I'd find someone that can help you along the way or do it for you. But there is no way to do this without a machine shop, even with all brand new parts and a "finished" block. Most piston sets out there are 4.07 bore anyways.
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Old 08-08-2013, 09:17 AM   #16
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LSX blocks are iron and you'll be adding at least 80 lbs to the car, don't recall the exact weight increase.

If you were looking to go in the 8's I'd see doing one, the 6 bolt design will give you more clamping force, will do a better of keeping the heads from lifting under high cylinder pressure.

In the 4th gen days we went 6 bolt when the cars were going low 8's and quicker. 5th gens are over 500 lbs heavier, sometimes like 900 lbs, so I'd say anything in the 8's I'd think about it.

9, 10 second car, I don't see the need.
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