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**jmader** · 10-04-2013, 04:00 PM

Hey guys I'm a little confused with some numbers here. It's an inline 6 with a block casting number 3921968. My research says that would be a 64-76 chevy 230 or 250 but stamped on the engine pad is f0421AM and 19w481526. What I could find of an AM suffix that would be a 235 from 1962. Any ideas?

10-04-2013, 04:00 PM	#1
jmader Senior Member Join Date: Aug 2013 Location: Grand Island, NE Posts: 1,483	Help identify engine in 64 c10 Hey guys I'm a little confused with some numbers here. It's an inline 6 with a block casting number 3921968. My research says that would be a 64-76 chevy 230 or 250 but stamped on the engine pad is f0421AM and 19w481526. What I could find of an AM suffix that would be a 235 from 1962. Any ideas?