View Poll Results: Which would you choose and why 427ci or 440ci LS7?
427ci LS7
21
30.43%
440ci LS7
48
69.57%
Voters: 69. You may not vote on this poll
427ci vs 440ci LS7
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I know that bigger cubes create greater backpressure problem for the turbo/s.
Edited to clarify.
Last edited by bluecamaroz28; Feb 29, 2008 at 08:24 AM.
Either engine will generate plenty of exhaust gas volume for your turbocharger.
The shorter stroke will make for a thicker upper ringland. It will also theoretically increase sideloads on the piston skirts, which will shorten engine life. However I doubt you would use either engine for 100K+ miles anyway.
The shorter stroke will make for a thicker upper ringland. It will also theoretically increase sideloads on the piston skirts, which will shorten engine life. However I doubt you would use either engine for 100K+ miles anyway.
NA the stroke is fine as long as the builder is not in the "learn" mode.
4.125 "squared" is well within the liners of a LS7 block and requires no boring or excessive clearancing. They make > 550 square rw hp/tq. We do those.
For FI I think I would go iron block.
4.125 "squared" is well within the liners of a LS7 block and requires no boring or excessive clearancing. They make > 550 square rw hp/tq. We do those.
For FI I think I would go iron block.
Last edited by See5; Feb 29, 2008 at 01:38 PM.
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Then if stroke isn't the best for FI then why does everyone go big stroke
instead of just going big bore. I think a 387cid all bore will out do a 408 stroker
both running the same boost since the 387 with spin up faster. If the engine builder
knows what he's doing you can FI any motor. Dragsters are huge stroke and they are all
blown. But some of the best performing FI cars on this site are 347 forged motors like KP.
instead of just going big bore. I think a 387cid all bore will out do a 408 stroker
both running the same boost since the 387 with spin up faster. If the engine builder
knows what he's doing you can FI any motor. Dragsters are huge stroke and they are all
blown. But some of the best performing FI cars on this site are 347 forged motors like KP.
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Verdad Gallardo Then if stroke isn't the best for FI then why does everyone go big stroke
instead of just going big bore. I think a 387cid all bore will out do a 408 stroker
both running the same boost since the 387 with spin up faster. If the engine builder
knows what he's doing you can FI any motor. Dragsters are huge stroke and they are all
blown. But some of the best performing FI cars on this site are 347 forged motors like KP.
instead of just going big bore. I think a 387cid all bore will out do a 408 stroker
both running the same boost since the 387 with spin up faster. If the engine builder
knows what he's doing you can FI any motor. Dragsters are huge stroke and they are all
blown. But some of the best performing FI cars on this site are 347 forged motors like KP.
Then if stroke isn't the best for FI then why does everyone go big stroke
instead of just going big bore. I think a 387cid all bore will out do a 408 stroker
both running the same boost since the 387 with spin up faster. If the engine builder
knows what he's doing you can FI any motor. Dragsters are huge stroke and they are all
blown. But some of the best performing FI cars on this site are 347 forged motors like KP.
instead of just going big bore. I think a 387cid all bore will out do a 408 stroker
both running the same boost since the 387 with spin up faster. If the engine builder
knows what he's doing you can FI any motor. Dragsters are huge stroke and they are all
blown. But some of the best performing FI cars on this site are 347 forged motors like KP.
My thought is that it's a cost thing. If your putting the money into the power add and top end then you dont have it or need it for the crank and cylinder case ?
Last edited by 99blancoSS; Feb 29, 2008 at 12:02 PM.
TECH Apprentice
Joined: Oct 2007
Posts: 302
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LS7 block with 4.1" stroke, 438 cubes. Plenty of cylinder wall for piston stability with the high pin. Might as well get as many cubes as possible - this is what I'm building. There may be a small difference in the acceleration speed but it won't be much and valvetrain will probably be the rev limiting factor anyway.
If you're planning on some major spray or boost, either an LSX or Warhawk and pick the stroke and bore accordingly. One other thing to consider - rumor has it that there will be a raised cam/tall deck LSX block available that'll go to 500 cubes. I'd expect cylinder walls to be longer to handle all that stroke. Hell, yeah!!!!
If you're planning on some major spray or boost, either an LSX or Warhawk and pick the stroke and bore accordingly. One other thing to consider - rumor has it that there will be a raised cam/tall deck LSX block available that'll go to 500 cubes. I'd expect cylinder walls to be longer to handle all that stroke. Hell, yeah!!!!
Last edited by Busted Knuckles; Feb 29, 2008 at 04:19 PM.
Shoot we are using the Wiseco 4.187" custom forged nitrous pistons, Childs & Albert Fire Power rings (.043" .043" 3mm) with N2O... I have faith in our builder!
Registered User
Joined: Feb 2008
Posts: 12
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There's no replacement for displacement like everyone says. I love that down low end grunt that a higher displacement engine gives you. When I get ready for a new engine, I'm going to be looking at the LSX 454 engine. I want some cooking down low torque and still want it to be my bi-weekly/daily driver!
370 motor Blanco,
True i like the 370. I ran the numbers on a engine building program and the 370 was a great motor and showed potential. someday i wanna try either a
387 all bore with 12lbs, or go crazy with 427 or 454 with low boost mostly cause those motor sizes are classic chevy size motors
Den
True i like the 370. I ran the numbers on a engine building program and the 370 was a great motor and showed potential. someday i wanna try either a
387 all bore with 12lbs, or go crazy with 427 or 454 with low boost mostly cause those motor sizes are classic chevy size motors
Den
personally I was looking at the 440 as well, I currently have a 427 and its almost too much hahaha but as soon as I can get a tall deck warhawk sourced I am going for a 472 or a humble "little" 500 cubic in small block that would be righteous!!!!!