5.3 gen4 block, max bore??

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11-21-2010, 09:47 AM

Rhino79

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5.3 gen4 block, max bore??

What are the bore limitations, I know many have gone up to ls bore sizes but is 4" doable?

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11-21-2010, 10:16 AM

Bluchevypick

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No. It might be able to bore it there but it would live long at all. Ls1 bore is 3.89 i believe and my kachine shop says its a pita to do it that far.

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11-21-2010, 02:31 PM

iamkeniff

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3.905" is the MOST you can take the 4.8/5.3 block without having to worry about shi breaking. a ton of guys on here run that. its the LS1 5.7 bore. it's a PITA if your machine shop doesn't know a damn thing about machine work.

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11-21-2010, 07:19 PM

Three6GMC

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x2^^^^ 3.905 MAX

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11-21-2010, 08:09 PM

Rhino79

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Thanks guys found a couple good deals on virgin blocks.

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11-21-2010, 08:13 PM

ForcedTQ

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Quote:

Originally Posted by Rhino79

Thanks guys found a couple good deals on virgin blocks.

Also, make sure to have the bores sonic tested to ENSURE that the bores can be taken to a minimum of 3.898 (stock ls1 cylinder bore size) BEFORE you have them start to hog those bores out.