5.3 block

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Jan 1, 2014 | 05:57 PM

BOTTLE ROCKET

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From: GA

5.3 block

Anyone running a 5.3 bored to 3.9 and making decent power? (700-800rwhp)
Per my other post, I am building a LS1 for 770-800rwhp, and 13-15lbs boost, and have received lots of comments that a 5.3 bored out is too thin to hold the power.

Don't want to go to an Iron block, and just building something to cruise and play with. Not building a race car.
Thanks

Jan 1, 2014 | 07:05 PM

justinkp

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I'm curious also. My LS1 aluminum block held up to 765 until the bearings went after 1k miles. Sure it was a builder problem though.

Jan 2, 2014 | 12:50 AM

Blown06

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I've run a 5.3 bored to 3.9 for over 4 years with 20+ psi no problems. That being said the aluminum 5.7 should last at 700-800 hp. If it doesn't it aint the motors fault........its the builder or tuner.

Jan 2, 2014 | 07:15 AM

BOTTLE ROCKET

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From: GA

Quote:

Originally Posted by Blown06

That's great to hear. I will never run over 14-15lb (and maybe a little less then that) and it's not a track car.
I am being bombarded with guys telling me the bored 5.3 is too thin, and will crack with high hp and boost and I will HAVE to go with an iron block. I appreciate the advice, but I really don't want an iron block in a Vette if possible.

Jan 2, 2014 | 07:45 AM

hellbents10

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We have done a couple that make about 800-1000.

Jan 2, 2014 | 06:37 PM

HexenLord

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I thought the 5.3 over bored to a 5.7 had the exact same cylinder wall thickness as a LS1 since the bore spacings are identical.

Jan 2, 2014 | 08:36 PM

BOTTLE ROCKET

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From: GA

They could be, Im really not sure of the specs. I have just received a tremendous amount of replies saying the aluminum bored 5.3 would crack, blow, etc. if I ran boost and big hp.