LS1TECH - Camaro and Firebird Forum Discussion

408 vs 427

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Old Jun 10, 2008 | 06:48 AM
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Default 408 vs 427
I am thinking about getting rid of my 5.7 LS1 and going with either a 408 6.0 block or a 427. What would y'all suggest?
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Old Jun 10, 2008 | 06:51 AM
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what's your budget
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Old Jun 10, 2008 | 06:53 AM
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About $ 6,000.00.
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Old Jun 10, 2008 | 06:55 AM
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Originally Posted by hank22802
About $ 6,000.00.
Shortblock or longblock?
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Old Jun 10, 2008 | 06:57 AM
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Turnkey.
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Old Jun 10, 2008 | 06:59 AM
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also, are you wanting to stay N/A, or do you think you'll ever want to go with a turbo or supercharger?

if you want boost, i'd stay away from the 427 (7.0L)....from what i've heard, the cylinder walls are too thin to hold much boost. someone please correct me if i'm wrong on that, tho
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Old Jun 10, 2008 | 07:00 AM
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For that budget, you really have no choice but to go 408. If not smaller.
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Old Jun 10, 2008 | 07:08 AM
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Well, I have a friend that went from the 427 to a 408. I can get his 427 block pretty cheap. So, money is really out of the question. I just want to know if I would benefit more having a 408 vs a 427 or vice versa.
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Old Jun 10, 2008 | 07:11 AM
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Originally Posted by hank22802
Well, I have a friend that went from the 427 to a 408. I can get his 427 block pretty cheap. So, money is really out of the question. I just want to know if I would benefit more having a 408 vs a 427 or vice versa.
depends how much you spend on the heads, intake, headers etc.
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Old Jun 10, 2008 | 07:19 AM
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I know I have QUITE a bit more than $6k just in my LSX 427ci shortblock.
Good heads alone nowadays are $2k+(TEA TF, ET, AFR).
Stuff adds up really quickly.

I actually am selling my MTI heads off my 427, if you get your buddies block.
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Old Jun 10, 2008 | 07:30 AM
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Originally Posted by Black2001z06
I know I have QUITE a bit more than $6k just in my LSX 427ci shortblock.
Good heads alone nowadays are $2k+(TEA TF, ET, AFR).
Stuff adds up really quickly.

I actually am selling my MTI heads off my 427, if you get your buddies block.
Cool, I will keep that in mind. Thanks.
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Old Jun 10, 2008 | 08:48 AM
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Originally Posted by 2 SLOW
depends how much you spend on the heads, intake, headers etc.
Very true. The block is just one piece of the puzzle, The stuff you attach to the block often runs much more.

I would really go the 408 route if I were you. As money allows later, just spray it more
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Old Jun 10, 2008 | 09:08 AM
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NA = 427
Power Adder = 408
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Old Jun 10, 2008 | 10:25 AM
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Originally Posted by Black2001z06
I know I have QUITE a bit more than $6k just in my LSX 427ci shortblock.
Good heads alone nowadays are $2k+(TEA TF, ET, AFR).
Stuff adds up really quickly.

I actually am selling my MTI heads off my 427, if you get your buddies block.
Those heads are the bomb diggity. They make lots of power.
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Old Jun 10, 2008 | 11:01 AM
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Originally Posted by 7420NW7TH
NA = 427
Power Adder = 408
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