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The question, initially posted May 23, 2005, was:
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After 51,906,997 views, 7378 replies over 185 pages, this thread in General Truck Talk is a happening! And it's not just weekends anymore.


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What did you get done on your Bolt today????


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What 6 Cylinder do I have?
#1434269 Tue Dec 21 2021 04:47 AM
Joined: Aug 2013
Posts: 7
M
mismith Offline OP
'Bolter
What 6 cylinder is in my latest project ‘66? I’ve searched quite a bit and cannot find this block casting number in anyone’s list. The identification code leads me to believe it’s a 1971 year but there’s a lot I cannot find on it as well.

Block casting # 399425

Engine ID Code- F0604CAB
Engine VIN- 11N589180

What vehicle was Suffix Code “CAB”?
Is this a 250 or a 292?

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Re: What 6 Cylinder do I have?
mismith #1434290 Tue Dec 21 2021 03:33 PM
Joined: Feb 2004
Posts: 24,260
H
Kettle Custodian (pot stirrer)
230 and 250 engines use the same block. The cubic inch difference is in the crankshaft stroke. 292 engines have a taller side cover, and the motor mounts are offset about 3" from side to side. If you can get a borescope into a cylinder through a spark plug hole, look at the top of a piston. 230 engines have flat top pistons. 250's have dish tops. In the mid-1960's there was also a 194 cubic inch six used in the sub-compact Chevy II that looks similar to a 230/250.
Jerry


"Freedom's just another word for nothing left to lose"
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Re: What 6 Cylinder do I have?
mismith #1434292 Tue Dec 21 2021 03:55 PM
Joined: Sep 2010
Posts: 1,349
K
'Bolter
F is flint, 06 June ,04 day, cab 1970 250 with powerglide .

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kevinski 1954 GMC 9300 Welcome to the virtual Garage [stovebolt.com]
Re: What 6 Cylinder do I have?
mismith #1434344 Wed Dec 22 2021 02:37 AM
Joined: Sep 2011
Posts: 2,511
L
'Bolter
A little more info can be gathered by feeling the top of the piston through the spark plug hole.
There is a block casting date near the oil dipstick.

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