400cid+ genII block
Thread Starter
Teching In
Joined: Apr 2008
Posts: 4
Likes: 0
400cid+ genII block Hey guys. I hope i dont have this in the wrong section but i have a 96 LT4 Corvette coupe and was wondering about bigger displacement. i know you cant safely bore and stroke a LT motor bigger than 396 but was curious if there was an aftermarket block out there that would let you do it. if you have an LS you can either sleeve ur cylinders to get big cubes or go the C5R block route or get an LSX block. i was curious if we had any kind of options like this with a GenII block that would still accept LT components like heads and intake
You can go bigger than 396 in a LT1 block BUT the ONLY reason to is to say you have a big engine.
Are you looking for bragging rights at car shows or are you looking to make the car fast?? What sounds impressive to the average car show guys and what actually makes a car fast are not necessarily the same thing.
If money is no object a few months ago someone claimed to have a handful the ONLY handful of LTx "bowtie racing blocks" he may still have them they could go bigger.
I know a guy that modified a Donovan aluminum block to accept the mechanical WP, reverse flow cooling, and opti so that is another option is money flows freely.
Are you looking for bragging rights at car shows or are you looking to make the car fast?? What sounds impressive to the average car show guys and what actually makes a car fast are not necessarily the same thing.
If money is no object a few months ago someone claimed to have a handful the ONLY handful of LTx "bowtie racing blocks" he may still have them they could go bigger.
I know a guy that modified a Donovan aluminum block to accept the mechanical WP, reverse flow cooling, and opti so that is another option is money flows freely.
TECH Senior Member
iTrader: (3)
Joined: Oct 2006
Posts: 7,564
Likes: 4
From: Decatur, TN (N-W of Athens)
If it's a true Grand Sport Vette, I wouldn't mod that block. I'd find another year Vette block and mod it. But there really is no reason to go over even 383 really, let alone 396. On GenI you used to be able to hit 427, but I don't know if GenIIs can do that w/o only being a short lived motor, if at all.
Joined: Nov 2001
Posts: 10,023
Likes: 6
From: LT1 land...the "409" of the 90s!
You can go bigger than 396 in a LT1 block BUT the ONLY reason to is to say you have a big engine.
Are you looking for bragging rights at car shows or are you looking to make the car fast?? What sounds impressive to the average car show guys and what actually makes a car fast are not necessarily the same thing.
If money is no object a few months ago someone claimed to have a handful the ONLY handful of LTx "bowtie racing blocks" he may still have them they could go bigger.
I know a guy that modified a Donovan aluminum block to accept the mechanical WP, reverse flow cooling, and opti so that is another option is money flows freely.
Are you looking for bragging rights at car shows or are you looking to make the car fast?? What sounds impressive to the average car show guys and what actually makes a car fast are not necessarily the same thing.
If money is no object a few months ago someone claimed to have a handful the ONLY handful of LTx "bowtie racing blocks" he may still have them they could go bigger.
I know a guy that modified a Donovan aluminum block to accept the mechanical WP, reverse flow cooling, and opti so that is another option is money flows freely.
You can go bigger than 396 in a LT1 block BUT the ONLY reason to is to say you have a big engine.
Are you looking for bragging rights at car shows or are you looking to make the car fast?? What sounds impressive to the average car show guys and what actually makes a car fast are not necessarily the same thing.
If money is no object a few months ago someone claimed to have a handful the ONLY handful of LTx "bowtie racing blocks" he may still have them they could go bigger.
I know a guy that modified a Donovan aluminum block to accept the mechanical WP, reverse flow cooling, and opti so that is another option is money flows freely.
Are you looking for bragging rights at car shows or are you looking to make the car fast?? What sounds impressive to the average car show guys and what actually makes a car fast are not necessarily the same thing.
If money is no object a few months ago someone claimed to have a handful the ONLY handful of LTx "bowtie racing blocks" he may still have them they could go bigger.
I know a guy that modified a Donovan aluminum block to accept the mechanical WP, reverse flow cooling, and opti so that is another option is money flows freely.
Ive been told that larger then a 396 with an LT1 factory block is very risky.
I'm still stock Bore and I'm over 400cid..
The largest combo right now that can be gotten pretty easily is the 6.2l L92 or LS3 Block with a 4.000" Stroke Crank, that comes to a 418cid Engine.
I took a 6.0l Ironblock(2500HD Truck Engine) and dropped in a 4.000" Stroke Crank, which came out to a 402cid. That is the cheapest combo that is over 400cid.
The problem is why go to that much trouble and money with the Donovan and still end up with the opti-crap........ Id ditch that for at least the coil on plug mod if I was spending that much...
Ive been told that larger then a 396 with an LT1 factory block is very risky.
Ive been told that larger then a 396 with an LT1 factory block is very risky.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
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
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0
Brett Foote
