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Is 5.3 Iron block same as LS1?

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Old 06-10-2005, 03:06 PM
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Default Is 5.3 Iron block same as LS1?
I recently cracked my LS1 block. I can do an LS6 upgrade or go iron. My question is, can a 5.3 iron block be bored to basically the same as a 6.0, then use all of my stock accessories, heads, etc.

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-Adam
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Old 06-10-2005, 04:01 PM
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a 5.3 iron block cannot be bored to 6.0 but u could always use a bore strocke combo and get ur self there.
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Old 06-10-2005, 04:50 PM
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5.3 can be bored to a 3.905-3.908 very easily. It would make for a nice strong motor.
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Old 06-10-2005, 04:58 PM
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Do all accessory holes, etc, line up correctly for an 04 LS1? I imagine it would...
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Old 06-10-2005, 05:27 PM
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Yeah, you can get the 5.3 to the 5.7 bore (3.893), but not to the 6.0 bore (4.000).

Accessory mounts should line up, but if you have some bad luck, drilling and tapping an accessory hole wouldn't be that difficult
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Old 06-10-2005, 07:41 PM
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all the accessory holes will be identical 5.3 can be bored safely to 3.905
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Old 06-10-2005, 08:02 PM
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Hmm, interesting. This will end up being a 9:1 motor for my turbo. Would like to get a 6.0 but I might be able to get a deal on a new 5.3

Thanks for the replies.
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