408 or 427
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12 Second Truck Club
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From: Sittin on jackstands
408 or 427 Right now I have the 5.3 in my truck. But I love building motors. I'm new to these gen III's but know you can bore/stroke them to 408, 427 ci. What is involved in this. Don't the cylinders have to be sleeved? What crank is used? Is one signifigantly better than the other. I want something that will be reliable as a daily driver.
What block do I use the 5.3 5.7 or 6.0? I know the new LS7 is 427. So I would think someone could build a ultra reliable 427. Or is that motor (LS7) completely different?
Thanks for the help Gurus
What block do I use the 5.3 5.7 or 6.0? I know the new LS7 is 427. So I would think someone could build a ultra reliable 427. Or is that motor (LS7) completely different?
Thanks for the help Gurus
For a daily driver they will both be nice, but if you want to go FI/Nitrous i'd go with the 408, since the 427 needs to be wet sleeved if I am not mistaken.
You would need a 6.0L iron block, machined, then the internals like an eagle 4" crank for a 408
You would need a 6.0L iron block, machined, then the internals like an eagle 4" crank for a 408
Thread Starter
12 Second Truck Club
iTrader: (5)
Joined: Apr 2005
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From: Sittin on jackstands
I want to stay N/A I guess around 10:1? Like I said I'm not real familiar with these motors. Thanks though A 6.0 block hugh... Lets see what we find. Thanks
larger engine You have several options. You can build a 402 using either a 6 liter iron or LS2 aluminum block (4" bore) with 4" stroke. A 408 would require an iron block bored .030" over using a 4" stroke.
A Darton MID wet sleeved 427 can be built with an aluminum LS1 or LS6 block. A 4.125" bore and 4" stroke yield 427". The current MID sleeves will go to a max. bore size of 4.160" by the way. We have a new sleeve coming out for the LS1 block only which will go to 4.2" bore. With 4" stroke you would end up with 443" with 4.125" stroke 457". The wet liner would give one the strongest sleeved assembly for a max. effort engine.
On the near horizon is a ductile iron dry sleeved LS2 aluminum block with 4.125" bore. I am working with Darton to come out with a very reasonably priced kit in the next month or so. Thus one could build a dry sleeved 427" engine using the LS2 block utilizing much stronger liners than those used by the factory in the new LS7 engine.
Steve
A Darton MID wet sleeved 427 can be built with an aluminum LS1 or LS6 block. A 4.125" bore and 4" stroke yield 427". The current MID sleeves will go to a max. bore size of 4.160" by the way. We have a new sleeve coming out for the LS1 block only which will go to 4.2" bore. With 4" stroke you would end up with 443" with 4.125" stroke 457". The wet liner would give one the strongest sleeved assembly for a max. effort engine.
On the near horizon is a ductile iron dry sleeved LS2 aluminum block with 4.125" bore. I am working with Darton to come out with a very reasonably priced kit in the next month or so. Thus one could build a dry sleeved 427" engine using the LS2 block utilizing much stronger liners than those used by the factory in the new LS7 engine.
Steve
Originally Posted by white1
Right now I have the 5.3 in my truck. But I love building motors. I'm new to these gen III's but know you can bore/stroke them to 408, 427 ci. What is involved in this. Don't the cylinders have to be sleeved? What crank is used? Is one signifigantly better than the other. I want something that will be reliable as a daily driver.
What block do I use the 5.3 5.7 or 6.0? I know the new LS7 is 427. So I would think someone could build a ultra reliable 427. Or is that motor (LS7) completely different?
Thanks for the help Gurus
What block do I use the 5.3 5.7 or 6.0? I know the new LS7 is 427. So I would think someone could build a ultra reliable 427. Or is that motor (LS7) completely different?
Thanks for the help Gurus
__________________
Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
I got a 408 for sale right now and if you want a 10.1 compression you could just mill the heads or change gaskets. Just thought I 'd throw that in. Either one you chose will be beadass even N/A I'm building a 408 right now as well. Good Luck with your choice.
For me personally it would be anything with an aluminum block, I dont care to make my car heavier. If your gona get hardcore in to N2O and boost then the iorn block is your friend, just with 100 extra pounds.
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depends go w/ a 402... you love building engines, then you can get a stock block, and all of the components and put it together yourself. if you stay n/a and can afford it... go with the ls-2 6.0l block. if you plan on running any type of adder... 6.0 iron block.
