LSNext 454 vs. LS427 pros and cons.. - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

205 · 01-12-2019, 04:51 PM

Can I get some pro's and con's between the 2 blocks please. 99% street car. Looking for the best platform to grow into. Thanks

Moreair1 · 01-12-2019, 05:23 PM

I would say a lsx 427, that way if you ever do want to add boost the cylinder wall/sleeves are thicker and will stand up to higher boost

205 · 01-12-2019, 05:30 PM

Quote:

Originally Posted by Moreair1

I would say a lsx 427, that way if you ever do want to add boost the cylinder wall/sleeves are thicker and will stand up to higher boost

See!? That's funny. Because I thought the complete opposite. I thought the iron 454 would be better for boost... LOL

zz430camaro · 01-12-2019, 05:36 PM

454 or a iron 427

Moreair1 · 01-12-2019, 08:08 PM

Quote:

Originally Posted by 205

See!? That's funny. Because I thought the complete opposite. I thought the iron 454 would be better for boost... LOL

Sorry thought you had put up lsx454 not lsnext 454 block, I would do the lsnext block but at 427
https://borowskirace.com/blogs/news/...ock-comparison

205 · 01-12-2019, 08:40 PM

Quote:

Originally Posted by Moreair1

Sorry thought you had put up lsx454 not lsnext 454 block, I would do the lsnext block
https://borowskirace.com/blogs/news/...ock-comparison

I don't see a price on theirs.Edit… I see it now. Same price

205 · 01-12-2019, 08:43 PM

This is what I was looking at

https://www.shafiroff.com/chevy-ls-s...ock-lsnext.php

zz430camaro · 01-12-2019, 09:05 PM

Quote:

Originally Posted by 205

This is what I was looking at

https://www.shafiroff.com/chevy-ls-s...ock-lsnext.php

That looks bad ass!

DSMer1 · 01-12-2019, 10:22 PM

I went with a dart SHP iron with a 4"stroke and 4.125" bore for boost (427)
The lsx gm block is spectacular also.
I would not chose the 4.125" stroke and 4.185" bore for boost.
What are your plans for the car?

christianchevell · 01-13-2019, 07:41 AM

BTW the stock ls7 block can be only over honed .005, so unless its installed in the car most do not go the extra$$$$$$ to buy one aftermarket and lsx BTW usually means iron block and the lsx 454 is awesome and someday I may get one but for now I am poor so I went stock stroked ls3 block basically a throw away block stroked and someday ls7 small bore heads. You would want to look at things like long term sleeves being able to be replaced? over bore or hone, weight, four or six bolt...reinforcement, etc...

Moreair1 · 01-13-2019, 11:11 AM

Quote:

Originally Posted by christianchevell

BTW the stock ls7 block can be only over honed .005, so unless its installed in the car most do not go the extra$$$$$$ to buy one aftermarket and lsx BTW usually means iron block and the lsx 454 is awesome and someday I may get one but for now I am poor so I went stock stroked ls3 block basically a throw away block stroked and someday ls7 small bore heads. You would want to look at things like long term sleeves being able to be replaced? over bore or hone, weight, four or six bolt...reinforcement, etc...

Lsx 454 has been know to be weak under high boost, this is due to cylinder wall/sleeve thickness. The OP is looking at a lsnext 454 which is significantly stronger than the lsx454, see the link in a previous post

DSMer1 · 01-13-2019, 11:31 AM

4.185" is at the maximum bore for the dart block.
The 4.125" stroke is going to have some serious piston speed.
That motor is awesome but just the wrong choice for boost.

I'll ask again, 205, what are your plans/goals for the car?

If you are building for boost, the iron dart iron shp block is a great choice at a good price.
You can do a stock stroke with a 4.125" bore for a mean 388, a 4" stroke with the 4.125" bore for a 427 or almost anything in between.

The iron GM lsx block is awesome, but I'm not even sure if you are talking about that...

This is a strong deal and I think they are running a additional sale this month...
http://www.thompsonmotorsports.net/p...roducts_id=538

01-12-2019, 04:51 PM	#1
205 Drives: 2010 Camaro Join Date: Nov 2018 Location: OK Posts: 161	LSNext 454 vs. LS427 pros and cons.. Can I get some pro's and con's between the 2 blocks please. 99% street car. Looking for the best platform to grow into. Thanks

01-12-2019, 05:23 PM	#2
Moreair1 Drives: 2011 ss convertible Join Date: Jul 2015 Location: Colorado Posts: 1,329 View My Garage	I would say a lsx 427, that way if you ever do want to add boost the cylinder wall/sleeves are thicker and will stand up to higher boost __________________ Cai intake and a few other mods😎

01-12-2019, 05:36 PM	#4
zz430camaro Drives: 2015 1LE Join Date: Oct 2015 Location: Cleveland, OH Posts: 1,485	454 or a iron 427 __________________ 2015 1LE, TSP 225/236 113+3, VMAX Throttle Body, CAI with race scoop, GPI Ported Intake, Land Speed Stage 2 Heads, 1-7/8 headers, NPP exhaust, 25% Fluidampr, LT1-S Monster Clutch, 485 RWHP & 444 TQ

01-12-2019, 10:22 PM	#9
DSMer1 Drives: 14 and 15 SS's Join Date: Feb 2018 Location: Minneapolis, Minnesota Posts: 387	I went with a dart SHP iron with a 4"stroke and 4.125" bore for boost (427) The lsx gm block is spectacular also. I would not chose the 4.125" stroke and 4.185" bore for boost. What are your plans for the car? __________________ Bolt-ons!

01-13-2019, 07:41 AM	#10
christianchevell old school chevy rodder Drives: 2013 2SS/RS Manual,DM exhaust,CRT Join Date: Jul 2012 Location: Oregon Posts: 5,587 View My Garage	BTW the stock ls7 block can be only over honed .005, so unless its installed in the car most do not go the extra$$$$$$ to buy one aftermarket and lsx BTW usually means iron block and the lsx 454 is awesome and someday I may get one but for now I am poor so I went stock stroked ls3 block basically a throw away block stroked and someday ls7 small bore heads. You would want to look at things like long term sleeves being able to be replaced? over bore or hone, weight, four or six bolt...reinforcement, etc... __________________ 2021 Wild Cherry ZL1 A10, Sunroof, Data, Carbon, Nav, RotoFab Dry CAI, Elite x2, Borla ATK, Driveshaft shop

01-12-2019, 08:43 PM	#7
205 Drives: 2010 Camaro Join Date: Nov 2018 Location: OK Posts: 161	This is what I was looking at https://www.shafiroff.com/chevy-ls-s...ock-lsnext.php

01-13-2019, 11:31 AM	#12
DSMer1 Drives: 14 and 15 SS's Join Date: Feb 2018 Location: Minneapolis, Minnesota Posts: 387	4.185" is at the maximum bore for the dart block. The 4.125" stroke is going to have some serious piston speed. That motor is awesome but just the wrong choice for boost. I'll ask again, 205, what are your plans/goals for the car? If you are building for boost, the iron dart iron shp block is a great choice at a good price. You can do a stock stroke with a 4.125" bore for a mean 388, a 4" stroke with the 4.125" bore for a 427 or almost anything in between. The iron GM lsx block is awesome, but I'm not even sure if you are talking about that... This is a strong deal and I think they are running a additional sale this month... http://www.thompsonmotorsports.net/p...roducts_id=538 __________________ Bolt-ons! Last edited by DSMer1; 01-13-2019 at 11:44 AM.