Generation III Internal Engine 1997-2006 LS1 | LS6
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408 or 427

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Old Aug 25, 2004 | 09:37 AM
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Default 408 or 427

so should I go with a 408ci or 427ci with my 6.0 block I know there is a couple 408ci kits out there but I haven't seen any 427ci. what a the drawbacks to a 427ci motor, the 4.125 bore?
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Old Aug 25, 2004 | 09:40 AM
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I believe for 427 there is just more machine work you have to do to the block for the rods to clear, I went with a 408 myself and it worked out good.
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Old Aug 25, 2004 | 09:41 AM
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If you want 427 cubes you need a sleeved aluminum block.
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Old Aug 25, 2004 | 09:42 AM
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Do it up with the 427!

I'm building mine next summer.
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Old Aug 25, 2004 | 09:50 AM
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You can do many different sizes with a 6.0 Iron Block
402 = 4"bore x 4"stroke
408 = 4.030 bore x 4" stroke
414 = 4.060 bore x 4" stroke
422 = 4.030 bore x 4.125 stroke
427 = 4.060 bore x 4.125 stroke

These are off the top of my head, they should be correct
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Old Aug 25, 2004 | 09:53 AM
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Don't forget 4.060 bore X 4.250" stroke = 440.
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Old Aug 25, 2004 | 09:51 PM
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I have an iron block So the bottom of the block needs to be machined as well. That isn't to bad, worth the effort? I think It would be, I mean I like torque. So there's no problem with 427ci other than the bottom machine work? I was thinking the boar need to be 4.125 that's kinda thin, but I can live with a 4.125 crank stroke. SO is there enough room in the piston for the pin and the bottom oil ring? Or what? What pinston and what connecting rod?

Last edited by ace68; Aug 25, 2004 at 10:15 PM.
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Old Aug 25, 2004 | 09:53 PM
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I say go 408 or 414 if you have the iron block that way you keep the bore a bit bigger than the stroke. If you go aluminum definatly go 427.
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I`m thinking of a 455 iron block myself! With a big shot of spray!!
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