Largest crank for a 5.3

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Mar 26, 2012 | 07:46 PM

King Nothing

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From: Central Valley

Largest crank for a 5.3

What is the largest crank you can put in and run in an iron 5.3??

Mar 26, 2012 | 07:55 PM

batboy

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The largest stroker kit I've seen for the 5.3 is a 4.0" stroke which makes it 363 CID (5.9L). You can bore the 5.3 block out to 5.7 bore size and then use a LS1 stroker kit for 383 CID (6.2L).

Mar 26, 2012 | 08:08 PM

King Nothing

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An iron 383 with a procharger

Mar 26, 2012 | 08:16 PM

KCS

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You can do 4.125" stroke, but you probably wouldn't want to use it with a lot of boost.

Mar 26, 2012 | 10:00 PM

King Nothing

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I'll probably run 12-14lbs, I have a meth kit set up and I'll run it 9.5:1

Mar 27, 2012 | 05:05 AM

RezinTexas

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I just installed a 4" crank in my LM7 and the rod bolts have maybe .060-.070" clearance to the cylinder wall edges. A 4.125" crank will likely require some clearancing, but its probably not a big deal.