510cid small block
FormerVendor
Joined: Nov 2001
Posts: 3,065
Likes: 6
From: Houston, Tx.
4.200 is the biggest I have seen personally but you could run 4.250 if the metal is there but it's really pushing everything. Some normal SBC deals are like that and they have the same bore spacing.
Sorry but the record for H/C is not 10.33
10.33 won't even beat the cam only record.
Pretty sure there was a stock internal car running around a 10.3
https://ls1tech.com/forums/drag-racing-results/818893-all-time-fastest-n-stock-ci-h-c.html
10.33 won't even beat the cam only record.
Pretty sure there was a stock internal car running around a 10.3
https://ls1tech.com/forums/drag-racing-results/818893-all-time-fastest-n-stock-ci-h-c.html
FormerVendor
Joined: Dec 2005
Posts: 250
Likes: 1
https://ls1tech.com/forums/generation-iv-internal-engine/457847-sam-s-500-ls2-project-progress-pics.html
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all it would do is fizzle, supporting a 4.5" stroke even on a talldeck block is going to leave next to nothing for a ringland, and 4.250 bore would mean almost no material left on the sleeve, i dont see the motor living very long between rebuilds and at 4.250 bore you would need a new block every time.
He is talking about an LSX block. You can build a 540ci+ small block from that block, but everyone is right. Finding a small block ls1 head to match the cubes is going to be very pricey!! I'm not even sure the make a head that could flow enough cfm for that build. He wouldn't have to get custom headers and intake built but the heads would be the main concern..
put down the crack pipe, even the tall deck when it comes out wont make a 540.
Sure dart may be able to make you a custom super tall deck block but 540 is ridiculous.
http://www.crateenginedepot.com/stor...FQEnGgodVjl7uQ
http://www.gmperformanceparts.com/En...6454&engCat=ls
Last edited by odarabla; Jun 28, 2008 at 02:16 AM.
Uhm, by my calculator, the advertised maximum dimensions of the LSX block (4.25 bore x 4.50 stroke) yields 510.71ci, not 540. . . .
For that matter, good luck putting a crank longer than 4.125" in the standard-deck LSX block anyways, which by the way has the same ~5.5" cylinder length as the 6L and LS1,2,3 blocks. A 4.25 stroke CAN be done, but the builder and piston engineer have to REALLY know what they're doing. I don't know where GM came up with the 4.5" number, that'd require a piston with something like a 0.5" or shorter CH, which is physically impossible.
Now if you sleeve a block with a ERL deck plate, then yeah, 4.5" stroke no prob. . . .
For that matter, good luck putting a crank longer than 4.125" in the standard-deck LSX block anyways, which by the way has the same ~5.5" cylinder length as the 6L and LS1,2,3 blocks. A 4.25 stroke CAN be done, but the builder and piston engineer have to REALLY know what they're doing. I don't know where GM came up with the 4.5" number, that'd require a piston with something like a 0.5" or shorter CH, which is physically impossible.
Now if you sleeve a block with a ERL deck plate, then yeah, 4.5" stroke no prob. . . .
Uhm, by my calculator, the advertised maximum dimensions of the LSX block (4.25 bore x 4.50 stroke) yields 510.71ci, not 540. . . .
For that matter, good luck putting a crank longer than 4.125" in the standard-deck LSX block anyways, which by the way has the same ~5.5" cylinder length as the 6L and LS1,2,3 blocks. A 4.25 stroke CAN be done, but the builder and piston engineer have to REALLY know what they're doing. I don't know where GM came up with the 4.5" number, that'd require a piston with something like a 0.5" or shorter CH, which is physically impossible.
Now if you sleeve a block with a ERL deck plate, then yeah, 4.5" stroke no prob. . . .
For that matter, good luck putting a crank longer than 4.125" in the standard-deck LSX block anyways, which by the way has the same ~5.5" cylinder length as the 6L and LS1,2,3 blocks. A 4.25 stroke CAN be done, but the builder and piston engineer have to REALLY know what they're doing. I don't know where GM came up with the 4.5" number, that'd require a piston with something like a 0.5" or shorter CH, which is physically impossible.
Now if you sleeve a block with a ERL deck plate, then yeah, 4.5" stroke no prob. . . .
Last edited by odarabla; Jun 28, 2008 at 04:52 AM.
FormerVendor
Joined: Nov 2001
Posts: 3,065
Likes: 6
From: Houston, Tx.
Yep it might be possible with the taller deck block just not the normal deck block as DrZ says. There just not enough cylinder for that stroke on the shorter deck engine.
Has the tall deck LSX even been released yet? If not, why are we discussing it in the present tense, ie "you can build a 540ci+ small block from that block"??? With the current GM offering (standard deck only), the biggest practical LSX you can build is still around 460-470 ci, so it's misleading to suggest a 500+ci LSX can be built today since the tall deck version isn't in the hands of builders yet. . . .
EDIT: Some searching revealed the tall deck version was SUPPOSED to be released this month or last, but I haven't heard anything more about it, nor seen anyone who claims to have one in their hands yet. . . .
EDIT: Some searching revealed the tall deck version was SUPPOSED to be released this month or last, but I haven't heard anything more about it, nor seen anyone who claims to have one in their hands yet. . . .
Last edited by drz; Jun 28, 2008 at 09:20 PM.
FormerVendor
Joined: Nov 2001
Posts: 3,065
Likes: 6
From: Houston, Tx.
What I was saying is that on regular 4.400 bore spacing blocks they have already succesfully run 4.250 bores so if you had the right LSX block you could probably do that on an NA only engine if you wanted to push it all you could.
https://ls1tech.com/forums/sponsor-vehicle-projects-shop-tours/621016-sam-erl-wiseco-pistons-500-ls2-buildup.html
There is a link to the build up and basic spec info. (Even dyno sheets overlaying nitrous and N/A pulls)
The pistons had a pretty tall compression height on them by the way as that motor had plans on getting sprayed at the track, etc. Even with the 4.500" stroke, it turned upwards of 6,600 rpm with no problems whatsoever. Ring's sealed up, cylinders looked/stayed strong with multiple 900+ horsepower pulls.
With the newer tall deck LSX option, it certainly holds a bright future for NICE pump gas N/A builds for people who would like to go that route.
TECH Enthusiast
Joined: Jan 2008
Posts: 625
Likes: 0
I can go into more detail tomorrow. I just got back into town.
https://ls1tech.com/forums/showthread.php?t=621016
There is a link to the build up and basic spec info. (Even dyno sheets overlaying nitrous and N/A pulls)
The pistons had a pretty tall compression height on them by the way as that motor had plans on getting sprayed at the track, etc. Even with the 4.500" stroke, it turned upwards of 6,600 rpm with no problems whatsoever. Ring's sealed up, cylinders looked/stayed strong with multiple 900+ horsepower pulls.
With the newer tall deck LSX option, it certainly holds a bright future for NICE pump gas N/A builds for people who would like to go that route.
https://ls1tech.com/forums/showthread.php?t=621016
There is a link to the build up and basic spec info. (Even dyno sheets overlaying nitrous and N/A pulls)
The pistons had a pretty tall compression height on them by the way as that motor had plans on getting sprayed at the track, etc. Even with the 4.500" stroke, it turned upwards of 6,600 rpm with no problems whatsoever. Ring's sealed up, cylinders looked/stayed strong with multiple 900+ horsepower pulls.
With the newer tall deck LSX option, it certainly holds a bright future for NICE pump gas N/A builds for people who would like to go that route.