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Old 03-08-2009, 02:28 PM   #1
pieriusw
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cubic inches

Hi guys, just got a 1966 gmc pickup that was given to me. It's a straight 6. Don't know the cubic inch size. Can anybody tell me how to tell?
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Old 03-08-2009, 02:52 PM   #2
SCOTI
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Re: cubic inches

Quote:
Originally Posted by pieriusw View Post
Hi guys, just got a 1966 gmc pickup that was given to me. It's a straight 6. Don't know the cubic inch size. Can anybody tell me how to tell?
Casting numbers researched on the web is one option..... http://home.znet.com/c1937/Cast.htm

General rule of thumb is 230 & 250's had the 'small side covers' & 292's had the large side covers w/the larger valve cover.
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Last edited by SCOTI; 03-08-2009 at 02:59 PM.
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Old 03-08-2009, 04:51 PM   #3
pieriusw
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Re: cubic inches

Thanks Scott, that pretty much clears it up. I'll take the valve cover off then take the gasket down to local parts store. Thanks again.
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Old 03-09-2009, 12:06 AM   #4
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Re: cubic inches

The 230's and 250's had the motor mounts straight across from each other. The 292 had the motor mounts slightly offset.
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Old 03-09-2009, 11:35 AM   #5
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Re: cubic inches

If I recall the side covers on a 230/250 are around 4-inches tall and the 292 is closer to 6-inches.
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