350 vs 355

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Sep 25, 2007 | 10:32 PM

oneledvr

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Joined: Oct 2002

Posts: 232

From: North of Detroit

350 vs 355

If you had two identically prepped LT1 engines with the exception of the size of the bore (.030") difference, which I believe is a 355, how much more HP would a 355 produce??

Sep 26, 2007 | 01:04 AM

ev95355

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Joined: May 2006

Posts: 62

From: Mt Prospect IL

800HP would be cool, however i'm going to say 1.25HP.

Sep 26, 2007 | 02:09 AM

bombebomb

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Joined: May 2006

Posts: 1,855

From: Ohio

Not very much at all, dout ud even be able to notice it.

Sep 26, 2007 | 07:24 AM

Geezer powered

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Joined: Jul 2003

Posts: 1,025

From: usa

I'd go with 2.75 rwhp. I hate when people say bored to 355 on a stock rebuid...........

Sep 26, 2007 | 09:31 AM

White96Z28

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Joined: Jan 2007

Posts: 242

From: Vegas

I would say five at most. You bore 30 over to clean up the cylinder walls, not for an increase in HP...

Sep 26, 2007 | 12:49 PM

95z28 -quicksilver

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Joined: Apr 2000

Posts: 1,070

From: Austin, TX or Texas State University at San Marcos

I saw an increase in horsepower going from 350 to 355 but I went with pop up pistons which increased my compression and got a new dynotune so that probably had alot to do with it.