SBO NOS 350 Block

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April 29th, 2019 | 07:24 AM

Thirdcoast

Thread Starter

Registered User

Joined: Jan 2019

Posts: 91

From: South Texas Crossroads

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 | 07:36 AM

olds 307 and 403

Out of Line, Everytime😉

Joined: Dec 2006

Posts: 9,186

From: Melville, Saskatchewan

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 | 07:47 AM

joe_padavano

Old(s) Fart

Joined: Mar 2007

Posts: 48,407

From: Northern VA

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.