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Old 09-29-2007, 01:13 PM
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What is this GM engine? GM 460776 on block

One of the heads has what appears to be a 376450 casting number. I just pulled this small block from my 1940 Ford street rod and am anxious to begin my first engine rebuild. I did a quick check and found 3.5" stroke and 3.75" bore that yields 309 cu. in., so I don't know if it's a 305 or 307 cu. in. engine.

The casting number on the block is GM 460776. Help please?

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Old 09-29-2007, 01:23 PM
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Quote:
Originally Posted by 1940 Ford
One of the heads has what appears to be a 376450 casting number. I just pulled this small block from my 1940 Ford street rod and am anxious to begin my first engine rebuild. I did a quick check and found 3.5" stroke and 3.75" bore that yields 309 cu. in., so I don't know if it's a 305 or 307 cu. in. engine.

The casting number on the block is GM 460776. Help please?
From the Mortec web site at:
http://www.mortec.com/castnum.htm

This is a 1978 or 79 305 with 2 bolt mains.
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Old 09-29-2007, 10:11 PM
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I don`t know if you meant to build another project or the 305. To be honest I wouldn`t waste my time on a 305 unless I was looking for economy. The 450 heads are pathetic wheezer heads that were used on the 262, 267, and 305 engines, they have real small 1.71 valves and not real good intake ports.
You can make a 305 run, but it will cost more, more than building a 350. If you stick with the 305, get some 416 or 601 casting heads, or better yet S/R torquer 305 heads.
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Old 09-29-2007, 10:42 PM
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just checked the milage on my 305 ...hauling some stuff lawnmower etc 11.4
Shane
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Old 09-30-2007, 04:16 PM
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Quote:
Originally Posted by SLR_65
From the Mortec web site at:
http://www.mortec.com/castnum.htm

This is a 1978 or 79 305 with 2 bolt mains.
FFR: 305s never came with 4 bolt mains from the factory.
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Old 09-30-2007, 05:47 PM
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Originally Posted by DHMag
FFR: 305s never came with 4 bolt mains from the factory.
Few Canadian trucks got 4 bolt 305s
Shane
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Old 09-30-2007, 07:34 PM
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Originally Posted by Chevrolet4x4s
Few Canadian trucks got 4 bolt 305s
Shane

depends on which online reference you choose to believe. personally, i have never seen a factory 4 bolt 305.
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Old 09-30-2007, 08:24 PM
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460778.....305...78-79...2 or 4, some Canadian assembled heavy duty truck blocks have 4-bolt main caps


http://www.mortec.com/castnum.htm

Just going by what they say
Shane
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