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248/270?
#39698 01/31/2004 2:30 AM
Joined: Feb 2000
Posts: 69
Vallejo, CA
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uncleb
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'Bolter
uncleb
'Bolter
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Joined: Feb 2000
Posts: 69
Vallejo, CA
My engine block number is 2135412; how can I determine if it is a 248 or a 270 block?
ron

1925 GMC K-101 5-Ton Truck
1936 Chevy Suburban
1933 Yellow Coach Bus Model 709
Re: 248/270?
#39699 01/31/2004 2:48 AM
Joined: Oct 2003
Posts: 445
aliquippa.pa
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dan-pa Offline
Shop Shark
dan-pa
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Joined: Oct 2003
Posts: 445
aliquippa.pa
Buy a book on your truck or hope someone can give you the info.I think the manual is your best route in the long run For around $20 it will answer all your ???????'s

dan-pa
Re: 248/270?
#39700 01/31/2004 3:34 AM
Joined: Jul 2003
Posts: 101
Grand Junction, CO
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izzenhood Offline
Wrench Fetcher
izzenhood
Wrench Fetcher
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Joined: Jul 2003
Posts: 101
Grand Junction, CO
On a GMC, the first 3 numbers on the flat machined surface on the block, just behind the distributor, will be the displacement of 228, 248, 270, and 302 motors.
Re: 248/270?
#39701 01/31/2004 5:32 AM
Joined: Jul 2002
Posts: 385
Seattle
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Hedgehog Offline
'Bolter
Hedgehog
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Seattle

1955 First Series GMC 250 1-Ton Panel
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Re: 248/270?
#39702 01/31/2004 5:36 AM
Joined: Nov 2003
Posts: 53
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dukw45 Offline
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dukw45
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I have found the numbers at http://www.inliners.org/casting/numgame.html to be accurate. It shows that block only being used for the 270.

I agree the manual is a good inverstment, but I have never found them much good in trying to identify a motor.

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