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Using a 5.3 block for a 347

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Old Jan 31, 2009 | 08:51 PM
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Default Using a 5.3 block for a 347
Anyone gone this route? I am wondering if the block would hold up better than a LS1 block for a boost application?
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Old Jan 31, 2009 | 08:58 PM
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they are iron aren't they?
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Old Jan 31, 2009 | 09:00 PM
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yes they are
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Old Jan 31, 2009 | 09:04 PM
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I know they add about 75 pounds but just wondering if the iron block is a stronger platform for a boost motor?
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Old Jan 31, 2009 | 09:10 PM
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i assum so
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Old Jan 31, 2009 | 09:21 PM
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A friend of mine ran a 5.3L block bored out to make it a 347. I think WCCH and a guy named Rex had their hands on it. He ran it in his GMC Sierra with a Radix(?) blower. It ran real good before he sold it, he just kept breaking trannys.
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Old Jan 31, 2009 | 11:36 PM
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A guy on the turbo forums made over 1000rwhp on a 346 cubed 5.3 block.
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Old Feb 1, 2009 | 02:26 AM
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Originally Posted by slow67
A guy on the turbo forums made over 1000rwhp on a 346 cubed 5.3 block.


thats what im talkin about! Not saying it cant be done on a aluminum lsx motor but this block is solid. Iron 6 bolt main block.. come on now. Thats also why i sold my lt1 and bought a 5.3. I have a feeling there gonna be the new "swap engine", not because there better then a ls1 but because you can make incrediable power on a motor you can pick up complete for $500 all day long!
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Old Feb 1, 2009 | 10:46 AM
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There are several guys over on Perfomancetrucks.net, the sister site to here that have gone this route. It makes a very strong platform. I was gonna go that route with my 4.8 and a 5.3 crank till I found a smoking deal on a low mile LS1 short block.

BTW, The 5.3 is out made but 3 to 1 then any other LSx type motor
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Old Feb 4, 2009 | 10:30 PM
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So would you have to sleave the block or just bore it?
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Old Feb 4, 2009 | 10:32 PM
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Originally Posted by kbracing96

BTW, The 5.3 is out made but 3 to 1 then any other LSx type motor

huhhhhhhh??
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Old Feb 4, 2009 | 10:36 PM
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There are 3 5.3 for every 1 5.7 LS1's.
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Old Feb 4, 2009 | 10:39 PM
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thats what i was thinking but i can see that.
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Old Feb 4, 2009 | 11:03 PM
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Originally Posted by spaz1
So would you have to sleave the block or just bore it?
Just bore it.
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