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Jul 21st, 2025 | | | | Joined: Oct 2017 Posts: 4 New Guy | | New Guy Joined: Oct 2017 Posts: 4 | I just purchased a 1956 pickup 3100 and I am trying to figure out the engine numbers. it has a casting number 6GM 3731548 block stamping is F 4i 8F on the rear of the block it says C57 | | | | | Joined: Feb 2002 Posts: 2,877 Socket Breaker | | Socket Breaker Joined: Feb 2002 Posts: 2,877 | Is it a GMC or a Chevy? Inlinersis a good place to start, check out the casting #'s section. I'm sure someone with the stack of parts numbers books will be along shortly. -W | | | | | Joined: Oct 2017 Posts: 4 New Guy | | New Guy Joined: Oct 2017 Posts: 4 | It is a chevy- I tried doing a search but I cannot find anything similar to those numbers | | | | | Joined: Apr 2006 Posts: 506 Shop Shark | | Shop Shark Joined: Apr 2006 Posts: 506 | Does it have 1 or 2 valve covers?
Your casting # 3731548 is probably a
V-8... 1957 283 engine.
-Tom
1950 Chevy 3100 w/ 1956 235
| | | | | Joined: Dec 2014 Posts: 13 New Guy | | New Guy Joined: Dec 2014 Posts: 13 | It could also be a 1957 265 V8. That year they have the same casting number. The stamp code on the front passenger bank will tell you the original application if it hasn't been removed during a rebuild. The only other way to tell would be the bore diameter; 3.75" for the 265 and 3.875" for the 283.
1957 Chevy 3200
1971 Jeep CJ-5
1983 Chevy K-10
| | | | | Joined: Oct 2017 Posts: 4 New Guy | | New Guy Joined: Oct 2017 Posts: 4 | It is a v8 for sure with a single barrel carb. The block casting indicates it is a 1957 per the searches I have done. But it is out of a 1956 chevy 3100 pickup. The block stamping does not make sense though. F 4(capital i) 8F that is all that is there. I guess I am trying to figure out if there is any value to the engine and muncie SM 420 transmission which has a code 2GM 591953 A1156 | | | | | Joined: Dec 2014 Posts: 13 New Guy | | New Guy Joined: Dec 2014 Posts: 13 | The stamp code from the motor say it was assembled at Flint (F) April (4) 18th (I8) for a 283 V8 with Powerglide for a passenger car (F). The '57 265/283 is an upgrade from the '55-'56s as it doesn't have the weird notched distributor to allow oiling of the top end. Someone probably pulled it to replace either an Inline 6 or bad V8. Someone restoring a '57 passenger car may want the motor. All 4 bbl carb and automatic V8 cars got 283s in '57 and 2bbl stick cars kept using 265s as did all 3000 and 4000 series trucks. I'd take the 4 speed if I was closer.
Last edited by AtomicYJ; 10/21/2017 6:23 AM.
1957 Chevy 3200
1971 Jeep CJ-5
1983 Chevy K-10
| | | | | Joined: Feb 2002 Posts: 2,877 Socket Breaker | | Socket Breaker Joined: Feb 2002 Posts: 2,877 | oh, it's a v8, if I had known that I would not have sent you to the inliners site.  glad someone got you sorted out, thanks AtomicYJ. -W | | | | | Joined: Oct 2017 Posts: 4 New Guy | | New Guy Joined: Oct 2017 Posts: 4 | Would this be the same engine they used in a corvette? | | |
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