SBO NOS 350 Block

Reply Subscribe

Thread Tools

Search this Thread

Apr 29, 2019 | 06:24 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

Apr 29, 2019 | 06:36 AM

olds 307 and 403

Out of Line, Everytime😉

Joined: Dec 2006

Posts: 10,109

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.

Apr 29, 2019 | 06:47 AM

joe_padavano

Old(s) Fart

Joined: Mar 2007

Posts: 50,803

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.