408/410 cu. Lt1
Thread Starter
On The Tree
Joined: Mar 2005
Posts: 111
Likes: 0
From: Buffalo
408/410 cu. Lt1 Has anyone heard of a 408/410 Lt1 stroker, or running a 4 inch stroke in a LT1 block. Reason is I'm looking for 2816 alloy pistons for a 4inch stroke 4.030 or 4.040 bore with a 6 inch rod. All I can find are 4032 alloy.
TECH Senior Member
iTrader: (3)
Joined: Oct 2006
Posts: 7,564
Likes: 4
From: Decatur, TN (N-W of Athens)
You could always go back to GEN I and modify the LT1 intake (or get a TPiS Mini-Ram) for a LT1 clone. GM sells new GEN I blocks with more metal that lets you push them into the 450ci range and hold 800hp. World Motors has similar blocks. Like their BBC is punched to 632ci 
But I would think you could punch an LT1 to that since it's possible to do .060. Not sure how safe it is though heh People who do that probably just race the motor a few times.
Wonder if you could punch it way out and then sleeve it like the LT5?
Sorry I'm not much help :\
But I would think you could punch an LT1 to that since it's possible to do .060. Not sure how safe it is though heh People who do that probably just race the motor a few times.
Wonder if you could punch it way out and then sleeve it like the LT5?
Sorry I'm not much help :\
It is possible to make a 409 LT1 but it wont net anymore gain then a 383-396 LT1 due to the fact that the LT1 intake cannot flow enough to support it so unless you are going with a single plain or sheet metal intake its not worth the risk.
TECH Senior Member
iTrader: (3)
Joined: Oct 2006
Posts: 7,564
Likes: 4
From: Decatur, TN (N-W of Athens)
Originally Posted by 95FbFormula
It is possible to make a 409 LT1 but it wont net anymore gain then a 383-396 LT1 due to the fact that the LT1 intake cannot flow enough to support it so unless you are going with a single plain or sheet metal intake its not worth the risk.
do it with a sbc instead. get a badass intake/tb for it, standard dizzy, and a megasquirt or f.a.s.t. wont be LT1 anymore, but who cares? its nearly the same motor minus the opti and some other subtle differences. and a 408 would be no problem then.
Trending Topics
TECH Addict
Joined: Jul 2005
Posts: 2,153
Likes: 3
I say do it. The LT1 intake isn't great, but it can be worked. Raising the runner roof's helps alot. If you wanted to get serious, you could cut off the top and radius the port inlets better.
As for the cid, I'm running .060 at 20+ psi boost with no problems. I've heard that the LT1 block is a fairly stout piece and weighs about the same as a bow-tie block. I've heard of folks running up to .100 over if the block is sonic-checked. Even if you stopped at .090, you would only have to run a 3.875" crank to get 407 cid with less clearance issues. Or, if you wanted to run a 4" stroke, that would get you all the way to 420 cid.
By the way, the extra cubes WILL give you more low-end and peak torque whether the heads/intake flow well enough or not.
Mike
As for the cid, I'm running .060 at 20+ psi boost with no problems. I've heard that the LT1 block is a fairly stout piece and weighs about the same as a bow-tie block. I've heard of folks running up to .100 over if the block is sonic-checked. Even if you stopped at .090, you would only have to run a 3.875" crank to get 407 cid with less clearance issues. Or, if you wanted to run a 4" stroke, that would get you all the way to 420 cid.
By the way, the extra cubes WILL give you more low-end and peak torque whether the heads/intake flow well enough or not.
Mike
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo Thread Starter
On The Tree
Joined: Mar 2005
Posts: 111
Likes: 0
From: Buffalo
I don't have an LT1 sorry, I'm looking for pistons. I have a 2000 truck block that I'm putting a 4 inch stroke into. I have the crank and rods and I'm trying to find pistons. I can't seem to find 2618 alloy forged pistons. I want to spray it with a 250 shot. I thought this would be the spot for this thread since I'm using Bowtie Vortec 215 heads which have LT1 GEN II chambers. I really don't want to spend $800 for a set of pistons to be custom made, if I can find someone who makes them already.
Originally Posted by Vortec355
I don't have an LT1 sorry, I'm looking for pistons. I have a 2000 truck block that I'm putting a 4 inch stroke into. I have the crank and rods and I'm trying to find pistons. I can't seem to find 2618 alloy forged pistons. I want to spray it with a 250 shot. I thought this would be the spot for this thread since I'm using Bowtie Vortec 215 heads which have LT1 GEN II chambers. I really don't want to spend $800 for a set of pistons to be custom made, if I can find someone who makes them already.
the old L31 was still available in some 2000 model trucks. I believe they offered the old GMT800 style as a Classic and the big van didn't move to Gen3 stuff until even later.
To put a 4" stroke in a Gen1/2 SBC with 6.0" rods, you'll need pistons with a 1.025" compression height.
To put a 4" stroke in a Gen1/2 SBC with 6.0" rods, you'll need pistons with a 1.025" compression height.
Originally Posted by AdioSS
the old L31 was still available in some 2000 model trucks. I believe they offered the old GMT800 style as a Classic and the big van didn't move to Gen3 stuff until even later.
To put a 4" stroke in a Gen1/2 SBC with 6.0" rods, you'll need pistons with a 1.025" compression height.
To put a 4" stroke in a Gen1/2 SBC with 6.0" rods, you'll need pistons with a 1.025" compression height.
Ditto!, Good to be cautious tho Merv!
Vortec355, this is the Gen2 SBC (aka:LT1) section. It seems that you have a standard Vortec/GenIII truck platform which is technically considered to be "LSx". Please try reposting your question in the "Gen III Internal Engine" section.
Can you verify forsure that you have a Gen II engine? If not, I'll move this thread to a more useful section for you.
Jason
Can you verify forsure that you have a Gen II engine? If not, I'll move this thread to a more useful section for you.
Jason
Originally Posted by JasonShort
Vortec355, this is the Gen2 SBC (aka:LT1) section. It seems that you have a standard Vortec/GenIII truck platform which is technically considered to be "LSx". Please try reposting your question in the "Gen III Internal Engine" section.
Can you verify forsure that you have a Gen II engine? If not, I'll move this thread to a more useful section for you.
Jason
Can you verify forsure that you have a Gen II engine? If not, I'll move this thread to a more useful section for you.
Jason
TECH Addict
Joined: Jul 2005
Posts: 2,153
Likes: 3
Originally Posted by Vortec355
2000 truck block that I'm putting a 4 inch stroke into. ... I'm using Bowtie Vortec 215 heads which have LT1 GEN II chambers..
Mike
TECH Addict
Joined: Jul 2005
Posts: 2,153
Likes: 3
Originally Posted by Vortec355
I... Bowtie Vortec 215 heads which have LT1 GEN II chambers.
TECH Senior Member
iTrader: (3)
Joined: Oct 2006
Posts: 7,564
Likes: 4
From: Decatur, TN (N-W of Athens)
Just by looking at any head between Gen I/II and III, none will bolt up. And when you make a new engine from the ground up, you don't reuse old tech, since it's from scratch. Some ideas and theories always go along for the ride, but I couldn't see them doing any LT1 tech on an LS1 except maybe way back in the alpha-LSx testing days.
They make a lifter valley and move it into the head deck on the LSx.
Where as the older one is in the intake valley.
Unless I'm misunderstanding >_> Totally possible lol Basically what I got out of it is he was putting LTx heads on an LSx, yes?
They make a lifter valley and move it into the head deck on the LSx.
Where as the older one is in the intake valley.
Unless I'm misunderstanding >_> Totally possible lol Basically what I got out of it is he was putting LTx heads on an LSx, yes?
