V8 Long Stroke for high Boost
I had a 70 Camaro for years with an LS6 454 that was an absolute hoot, NA, solid roller with a little hit of giggle juice so I'll always have a soft spot for rat motors.
I'd love to do a big cubic inch max effort twin turbo BBC build but the SBE LS build pull is too strong lol.
Thread Starter
Teching In
Joined: Sep 2021
Posts: 44
Likes: 1
The block is very relevant. Let us know what block you plan on using and a power goal/intended application/ET/Weight etc. (IE drag car, 1000hp, stock block, 3000lbs 8.50's) Then we could suggest a bore/stroke. If you are talking factory LS 4-bolt blocks, then you leave them alone. There already isn't enough meat between the cyls on the 6.0 blocks for big power and stroking them pulls the piston out of the bore and rocks them, additional sideloads, etc... If you are running a tall deck aftermarket block, then that's much different! They are designed to handle greater bores/strokes. All comes down to cubic dollars in the end. If you want a "big" motor you pay "big" $. Which may or may not be necessary depending on your power/ET goal.
Thread Starter
Teching In
Joined: Sep 2021
Posts: 44
Likes: 1
I would like to build a big turbo big block, big power, and I see around that the Dart Big M is used a lot for big powers, I just don't know how thick it has to be to be reliable with 35-45 psi of pressure, so I don't know what maximum bore is recommended for this pressure level.
To date I have seen that the 5.3 resist well to great pressures, the lsx 427 also due to the thickness of the wall, and in the same way the L8T block which has recently been raised to 2077 horsepower (according to the mechanic it could reach even more ?
Having resolved the doubt of the thickness of the walls of the cylinders, I will need to know more about the modifications to be made to the lubrication for high powers and pressures.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
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
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 Thread Starter
Teching In
Joined: Sep 2021
Posts: 44
Likes: 1
I have seen that many 30 psi turbo big blocks produce 3000 horsepower with 400 cfm heads, and in the 4000-4500 hp dragster the 500-550ci big blocks reach 45-50 psi, but it is not specified what block it is, and when it is a big m they do not specify how much they bore the cylinders
yes, I know this, but I don't know if a big block or a small block motor is more resistant for the boost.
I have seen that many 30 psi turbo big blocks produce 3000 horsepower with 400 cfm heads, and in the 4000-4500 hp dragster the 500-550ci big blocks reach 45-50 psi, but it is not specified what block it is, and when it is a big m they do not specify how much they bore the cylinders
I have seen that many 30 psi turbo big blocks produce 3000 horsepower with 400 cfm heads, and in the 4000-4500 hp dragster the 500-550ci big blocks reach 45-50 psi, but it is not specified what block it is, and when it is a big m they do not specify how much they bore the cylinders
What are your horsepower goals? After 1500 rwhp the lsx starts to not be a great option. People have made more, but the big block starts to look like a better option at that point. Boost pressure will vary greatly. That 540” big block will make 2000 plus rwhp with much less boost than an lsx. I’d think in terms of power goals instead of boost levels and where ever your boost level falls to make that power on the chosen engine combination is less important.
What are your horsepower goals? After 1500 rwhp the lsx starts to not be a great option. People have made more, but the big block starts to look like a better option at that point. Boost pressure will vary greatly. That 540” big block will make 2000 plus rwhp with much less boost than an lsx. I’d think in terms of power goals instead of boost levels and where ever your boost level falls to make that power on the chosen engine combination is less important.
I'm pretty sure you can go as high as 555" and still retain a standard block deck height which would utilize a ton of off the shelf parts, tall deck setups get a bit more difficult.
Pair that up with a couple big *** turbos and 1,000+whp on pump gas would be a cake walk, toss in race gas and go for 2,000+whp without even pushing the engine that hard.
The other factor is you'll have 555" of engine to use down low while not in boost which will be awesome.
Hopefully you have the chassis and tire to wrangle it lol.