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Old 09-30-2020, 09:02 PM   #1
68gmcdude
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1968 GMC motor a 230 or a 250?

Hi All...
I have a a 1968 GMC inline-6. Casting number is 3921968 which I know is either a 230 or 250 motor. Will the build sheet tell me for sure what size the motor is? The #11 engine box on the build sheet has PF in it. Please see pictures for reference. Thanks for you input.

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Old 09-30-2020, 09:56 PM   #2
kwmech
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Re: 1968 GMC motor a 230 or a 250?

I don't think there was a 230 option in '68, but there is this also:

https://media.lmctruck.com/pdf/CB/0010.pdf
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Old 09-30-2020, 10:15 PM   #3
68gmcdude
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Re: 1968 GMC motor a 230 or a 250?

Thanks KWMECH. Based on the chart you posted, it's a 250cid as the PF code is noted on it.
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Old 10-01-2020, 03:38 PM   #4
MJN
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Re: 1968 GMC motor a 230 or a 250?

PF is a 250, in my code book for 68 & 69 Truck, 155 hp. 68 got a 4 speed, 69 got 3 speed manual, RPO L22.
Other comments;
68 got HD clutch & K19 emissions (air injection)
69 was low compression
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Old 10-01-2020, 04:04 PM   #5
68gmcdude
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Re: 1968 GMC motor a 230 or a 250?

Thanks MJN. My '68 has a 3-speed column shift.
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Old 10-01-2020, 04:14 PM   #6
stomper
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Re: 1968 GMC motor a 230 or a 250?

Quote:
Originally Posted by kwmech View Post
I don't think there was a 230 option in '68, but there is this also:

https://media.lmctruck.com/pdf/CB/0010.pdf
I don't trust anything LMC publishes regarding options, trim, part applications, etc... So many mistakes in their catalog. It's not the bible.
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Old 10-02-2020, 12:29 AM   #7
67 twins
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Re: 1968 GMC motor a 230 or a 250?

FWIW my 67 owners manual shows the 230 as only being used in the P10 (bread truck style). So if it came out of a pickup I'd be pretty confident that it is a 250.
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