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Old Jan 10, 2020 | 11:09 AM
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Default Curious build
If you were to build a 6.5k long block for 800whp can you do that? Semi reliable what would be the best Gen 4 iron block throw in your own piston and rods with lsa heads what do you guys think? What would you do
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Old Jan 10, 2020 | 03:00 PM
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I’d use a LS3 block personally.
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Old Jan 10, 2020 | 07:38 PM
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You think you can build a ls3 to hold 800whp semi reliable for that price?
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Old Jan 10, 2020 | 07:49 PM
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A sbe LS3 can hold that no problem.
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Old Jan 10, 2020 | 09:23 PM
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I’m looking around but how much does a ls3 short block go for wondering if I should do rods and and pistons in one
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Old Jan 11, 2020 | 09:43 AM
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For 800rwhp I wouldn’t build it
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Old Jan 11, 2020 | 10:35 AM
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Just do a cam then?
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Old Jan 11, 2020 | 12:08 PM
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That’s all I did to mine was put a cam in.
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Old Jan 11, 2020 | 04:40 PM
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I'm still SBE LS3 and make 800+ RWHP.

So I'm probably close to 1000 crank. Really no need to build it but honestly if you want to have piece of mind and ability to really turn it up in the future you can put a decently cheap rod and piston in it and then the sky is the limit
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Old Jan 12, 2020 | 11:30 AM
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I like the idea of the ls3 getting a used block and throw in a stock crank rods and piston or after market crank I wouldn’t be past 850whp for a while wondering if I’d get away with sbe on 91 and meth later I’d like to build a 440 Boosted motor and push it up to 1200whp
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Old Jan 13, 2020 | 08:24 AM
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Stock block 5.3l Gen 4. Pistons, rods, stock crank and a set of as cast TFS 220 heads. Roughly $6500. Capable of 1500hp... <- This is what I am building for my TT setup.
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Old Jan 13, 2020 | 10:40 AM
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This is what I needed which gen 4 iron block? Are you getting it new or used what rods and pistons you going with?
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Old Jan 13, 2020 | 11:35 AM
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Originally Posted by GX427
This is what I needed which gen 4 iron block? Are you getting it new or used what rods and pistons you going with?
I'm doing an aluminum block. It's an LC9. Got it used and using Callies Compstar rods and Wiseco pistons from BTR. 1/2" headstuds and still 4 bolt heads. Going to push it to 1300+ WHP.
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Old Jan 13, 2020 | 11:51 AM
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Doesn’t 1/2 inch head studs cause a problem with the strength of the block or anything?
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Old Jan 13, 2020 | 12:02 PM
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Nope. Same setup (little stronger rod) is in a 4400lb truck putting down over 1600whp on 42psi.
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Old Jan 13, 2020 | 01:54 PM
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Originally Posted by jayyyw
Stock block 5.3l Gen 4. Pistons, rods, stock crank and a set of as cast TFS 220 heads. Roughly $6500. Capable of 1500hp... <- This is what I am building for my TT setup.
leaving it at stock displacement?
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Old Jan 13, 2020 | 03:55 PM
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All sleaved blocks i assume?
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Old Jan 13, 2020 | 04:39 PM
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Originally Posted by VVVROOMTX
leaving it at stock displacement?
Yes
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Old Jan 13, 2020 | 04:39 PM
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Originally Posted by Summerkruse13
All sleaved blocks i assume?
No, stock blocks
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Old Jan 13, 2020 | 05:11 PM
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Won’t the 220 heads be an issue with a 5.3 valves hitting the walls? Thought it needed a 4.0 bore or something
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