SBO NOS 350 Block

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April 29th, 2019, 06:24 AM

Thirdcoast

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Join Date: Jan 2019

Location: South Texas Crossroads

Posts: 91

SBO NOS 350 Block

I have found a NOS 350 block with the casting number 557752-3B which I think is a 77-80.

Is this a good block to build or do I need a 395558 69-76 block??

Thanks,

Thirdcoast

April 29th, 2019, 06:36 AM

olds 307 and 403

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Join Date: Dec 2006

Location: Melville, Saskatchewan

Posts: 8,911

Quote:

Originally Posted by Thirdcoast

I have found a NOS 350 block with the casting number 557752-3B which I think is a 77-80.

Is this a good block to build or do I need a 395558 69-76 block??

Thanks,

Thirdcoast

It depends on the power made. The early block is a much better foundation.

April 29th, 2019, 06:47 AM

joe_padavano

Old(s) Fart

Join Date: Mar 2007

Location: Northern VA

Posts: 47,265

All 1977-90 Olds gas blocks have windowed main webs, including that 350. The suitability depends on what you plan to do with it. It would be fine for a driver, not so much for a drag car.