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Old 03-11-2020, 05:02 PM   #1
SBPage1
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Re: Eng Block Identification

Thanks SStock

Here is what I found and what my dilemma is in trying to glean the info from the internet. Here is what I found. The casting numbers are the same. I could always measure the stroke, but was trying to save myself some time. I’ve already removed the pistons/crank.
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Old 03-12-2020, 11:27 PM   #2
sstock
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Re: Eng Block Identification

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Originally Posted by SBPage1 View Post
Thanks SStock

Here is what I found and what my dilemma is in trying to glean the info from the internet. Here is what I found. The casting numbers are the same. I could always measure the stroke, but was trying to save myself some time. I’ve already removed the pistons/crank.
You are going by the engine casting number, I'm going by the suffix which is HM, which further breaks it down to a 327 if it was indeed casted in 1968
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1953 3100 261cu in, sm420, 3.55 torque tube, omaha orange
1964 GMC 1000 series,custom, 305E, sm420
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Old 03-13-2020, 01:32 PM   #3
sstock
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Re: Eng Block Identification

Quote:
Originally Posted by SBPage1 View Post
Thanks SStock

Here is what I found and what my dilemma is in trying to glean the info from the internet. Here is what I found. The casting numbers are the same. I could always measure the stroke, but was trying to save myself some time. I’ve already removed the pistons/crank.
Yes that casting number puts it in the 4" bore family, the difference only is the crank/rods that got dropped into it. 302 had a 3" stoke, 327 had a 3.25" stroke and 350 had the 3.48 stroke cranks. HM tells you the actual engine application 250 hp 327 or 350 cu inch
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1953 3100 261cu in, sm420, 3.55 torque tube, omaha orange
1964 GMC 1000 series,custom, 305E, sm420
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