421CID stroker from texas speed
421CID stroker from texas speed ive been looking into this motor for my ss. i heard having that bore and stroke makes for a motor that is not so strong. and there were a couple other issues with that block. so my question is, does anyone here run this motor? does anyone know anything else that would help me? thankyou
IF you talking about a 4.1 stroke in a 6.0 iron block it is not ideal. The cylinder walls in an iron 6.0 are the shortest of the ls family. Save a little more money and go with a LS2/LS3 block or stick with a 4.00 stroke. I would.
man that is dissapointing....it says in the description that 12lbs boost is the the max and no more than a 200 shot. with the price being the same as a 408 it does seem to good to be true
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Why would it be weak? Even at 4.03" the sleeves are thicker then the ls1 sleeves plus it has alum between the cylinders. Now I would say that if you want to make big power with a big shot or big boost then you should pick the 4.0 stoke engine. The block is not the problem, it's the CH of the pistons. At a 4.1 or 4.125 stoke, you don't have alot of meat at the top of the piston. This is not a problem for a NA or small shot engine.
Last edited by FlamingTA; Sep 5, 2011 at 05:46 PM.
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Save for a better set-up..........you'll wish you had if you don't.
$3,800 for a 421ci short block..........save a little more and get a resleeved LS1 block. You can find LS1 blocks pretty easily and cheap. And the LS1 block is perhaps the strongest of all the LSx blocks ever made. You can send a block to someone like RED and for roughly $2,500 you'll get it back ready to assemble.....sleeves, machine work, stress relief, installation and decking, boring, honing, align honing.
Or use a resleeved LS2 block.
Yea, its easy for us to spend your money.....but man you'll have a block that'll take a serious beating and have plenty of room left for a rebuild, or two. You can do a 441ci, have plenty of sleeve length for a 4.125 stroke and a 4.125 bore. N/A...you can bore it more if you want to or need to later. Brian Nutter at Wiseco has just the piston for long strokes......
.
$3,800 for a 421ci short block..........save a little more and get a resleeved LS1 block. You can find LS1 blocks pretty easily and cheap. And the LS1 block is perhaps the strongest of all the LSx blocks ever made. You can send a block to someone like RED and for roughly $2,500 you'll get it back ready to assemble.....sleeves, machine work, stress relief, installation and decking, boring, honing, align honing.
Or use a resleeved LS2 block.
Yea, its easy for us to spend your money.....but man you'll have a block that'll take a serious beating and have plenty of room left for a rebuild, or two. You can do a 441ci, have plenty of sleeve length for a 4.125 stroke and a 4.125 bore. N/A...you can bore it more if you want to or need to later. Brian Nutter at Wiseco has just the piston for long strokes......
.
Why would it be weak? Even at 4.03" the sleeves are thicker then the ls1 sleeves plus it has alum between the cylinders. Now I would say that if you want to make big power with a big shot or big boost then you should pick the 4.0 stoke engine. The block is not the problem, it's the CH of the pistons. At a 4.1 or 4.125 stoke, you don't have alot of meat at the top of the piston. This is not a problem for a NA or small shot engine.
It's not really a wall thickness issue, it's an issue with piston design and having amongst the shortest sleeves of all the LSx family. If it's an iron block LQ engine going in my vehicle, I'd stick with a 408ci every time.
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i agree 100% does the 441CI and 454 CI have the same issue as the 421?
Correct, they are preferably built with either a sleeved block or an aftermarket block like the LSx or RHS block.
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Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
ive been looking into this motor for my ss. i heard having that bore and stroke makes for a motor that is not so strong. and there were a couple other issues with that block. so my question is, does anyone here run this motor? does anyone know anything else that would help me? thankyou
There were however 2 people that were very succesful with a 421. Tom the Roofer and Tim Tosto. Once upon a time they were the 2 fastest N/A cars.
I can't fault you for going to the 408, it is a more reliable, tried and true setup. I went for the 421 from ERL for a little something different and to get more average hp. The 421(4.03x4.125) won't make must more HP then the 408 really. It will probably make more average HP and torque. I was after that more average HP and higher flatter torque curve for my heavy as hell GTO. Good luck with the 408, I'm sure it will haul.