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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jul 2021 Posts: 27 'Bolter | | 'Bolter Joined: Jul 2021 Posts: 27 | I bought a 1951 3100 starting to do a rebuild and was checking the engine.
I was told it was a 216 but having a hard time checking the engine serial numbers to verify.
The stamp on the block is FI20IJ0 any idea if this is a 216. | | | | | Joined: Mar 2010 Posts: 1,660 Curmudgeon | | Curmudgeon Joined: Mar 2010 Posts: 1,660 | F = Flint assembly plant
I2 = Calendar month 12 = December
0I = Day = 01
J0 = Check again, this may be JC
JC = Light truck with RPO 227
The above applies to 1958 to 1962 years.
Either a 235 or 261 engine (captain's bar).
Get the code behind the starter to determine year of manufacture.
Picture of engine helpful if you need more info.
"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."
| | | | | Joined: Mar 2004 Posts: 6,214 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,214 | My research shows the "JC" designation as being for a 235 only with 3-speed trans and HD Clutch installed in a 1958/59 4000 series (1-1/2 ton truck) or in the 3000 series with RPO-227 (HD Clutch). Then in 1960 it was only available in the 1/2 to 1 ton trucks (C10, C20 & C30 and K10 & K20) when ordered with RPO-227 (HD Clutch). For 1961 and 62 they added the 40 series back into the mix (C10, C20, C30 & C40 and K10 & K20). I didn't find any mention of "JC" being a 261. Mike B  | | |
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