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Hi, trying to build a 07 Aluminum block 5.3 Ls motor whats is the max that I can bore it out to 🤔 and would boring help me generate more horsepower from the engine? I’m going to back it with a 4L80 transmission I knw that’s over kill but I rather go with the biggest that can fit it or am I going about all wrong? Please help this my 1st engine build with the LS family an really want to do it right the first time around. 1 sleeve is scratched so that’s the main reason why I’m boring it to clean up the sleeve but I knw you can transform a 5.3 to a 6.0 if it was a steel block and I’m thinking the max with the aluminum block would be a 5.7. Help we what crankshaft, Pistons and rods should I go with and with me boring do I have to change my 5.3 heads out? This is my 5.3 block and heads
A 5.7’s bore size is common on the aluminum 5.3’s. Add a 4” stroker crank and you’d be at 383ci. As far as heads go, how much do you have budgeted here? Ported oem with bigger valves would be best bang/buck, but aftermarket would be the best.
How about help instead of trying to crack jokes, your how old? It’s a block when I take it to get bored it will be cleaned up by the machine shop so help me with what I posted instead of trying to make jokes.
How about help instead of trying to crack jokes, your how old? It’s a block when I take it to get bored it will be cleaned up by the machine shop so help me with what I posted instead of trying to make jokes.
Holy crap, man! He was joking about the obvious in the pic.
If you get your panties in a wad that easily, go chill for a while.
A sense of humor isn't required to post here, but it goes a long way in getting along.
Chill, man.
Have the shop bore it to only what is required to find a smooth cylinder in the scratched hole. Don’t look at max overbore, as you’ll not find more power in a few thou. You’ll end up having a super thin sleeve and poor ring seal (due to cylinder flexing) if your looking for max bore on a aluminum block. Keep it simple.
Holy crap, man! He was joking about the obvious in the pic.
If you get your panties in a wad that easily, go chill for a while.
A sense of humor isn't required to post here, but it goes a long way in getting along.
Chill, man.
I know where he’s coming from and I have a sense of humor I’m just trying to get this done because I have other things to do after the swap. Right now I’m bout business on getting this done so business first filled me with knowledge then the jokes can come afterwards
Have the shop bore it to only what is required to find a smooth cylinder in the scratched hole. Don’t look at max overbore, as you’ll not find more power in a few thou. You’ll end up having a super thin sleeve and poor ring seal (due to cylinder flexing) if your looking for max bore on a aluminum block. Keep it simple.
A 5.7’s bore size is common on the aluminum 5.3’s. Add a 4” stroker crank and you’d be at 383ci. As far as heads go, how much do you have budgeted here? Ported oem with bigger valves would be best bang/buck, but aftermarket would be the best.
Or should I just clean a smooth out the sleeves and go with the 4” stroked crank🤔🤔?
I would recommend boring to 5.7 which is safe and an increase from 325 cubes to 346. What vehicle and weight is it going in? 383 cubes can help but money may be better off spent on heads. Just depends on vehicle, it's weight, goals and budget. Feel free to pm me if you wish.
I would recommend boring to 5.7 which is safe and an increase from 325 cubes to 346. What vehicle and weight is it going in? 383 cubes can help but money may be better off spent on heads. Just depends on vehicle, it's weight, goals and budget. Feel free to pm me if you wish.
Rob D
I got a 2000 Lincoln Town Car I’m trying to swap as far as the weight I don’t know because after the swap I’m changing the pumpkin also to a posi traction. Not trying to make a hot Rod but ppl see me an want to race so I’m just tryin to build something that when I hit the gas you knw to go play with somebody else if you get where I’m coming from.
I got a 2000 Lincoln Town Car I’m trying to swap as far as the weight I don’t know because after the swap I’m changing the pumpkin also to a posi traction. Not trying to make a hot Rod but ppl see me an want to race so I’m just tryin to build something that when I hit the gas you knw to go play with somebody else if you get where I’m coming from.
I would bore that block to 3.84 minimum. There are tons of pistons for that size. If that’s not enough to clean up the cylinders, then I’d go with stock LS1 pistons in a 3.898 bore. Either way, you’re not gonna win any illegal street races without boost or nitrous in that engine.
I just noticed that you have 317 heads laying there. Those are the worst heads you could possibly put on a 5.3L. I would use 706/862 heads, and port them myself. They will flow about the same as stock 243 or 317 heads after porting. If you can get 243s cheap, that would be a good option if you mill them down a bit.
when you buy a resleeved block from TSP, it’s usually a 5.3 aluminum block with a 4.125 bore. Those sleeves can be bored to 4.185 max.
dont ever buy anything from that sell out company, their customer service is garbage and so are their sleeved blocks. Steve at RED is the best of the best when it comes to sleeving an aluminum ls block.
If this block is a true Gen4 and not an L33 it can be safely bore to 3.900 plus or minus with cylinders being siamesed (no waster passes between them) they’re strong, it would likely only be good for resleeving after that bid overbore
09-16-2023, 10:24 PM
5.3 Aluminum Block Boring 
