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Labor Day Putting down your wrenches or time for
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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: Nov 2004 Posts: 266 Custom Title | | Custom Title Joined: Nov 2004 Posts: 266 | I just got my girlfriend a '65 K10 for her birthday. I'm 99.9% sure the engine has been swapped and I'm trying to figure out what it originally came out of, just out of sheer curiosity. Block casting is 3850817, 1962-1978 230/250. Stamped code by the distributor is F0624LK. I stuck my borescope in a spark plug hole and it has dished pistons so that says it's a 250. I've been digging and can't find the LK suffix code. The only one I found came up as a 427 and that's clearly not right. Any help is appreciated!
49 Chevy 3600
65 Chevy K10
48 International KB-1 Service Truck
55 Willys CJ5 - Chevy 331 powered
26 Model T Roadster Rat Rod
70 Tucker Sno-Cat 442-A
96 Dodge 3500 Cummins dually flatbed x-cab 4x4
06 Jeep Wrangler LJ rock crawler
If you can't fix it with a hammer, it's an electrical problem
| | | | | Joined: Feb 2004 Posts: 29,740 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,740 | Can't help with the suffix code, but the dished pistons definitely make it a 250. Both engines have the same bore- - - -3 7/8", but the 250 uses the dished piston to keep the compression ratio the same as the shorter stroke 230 engine. Flat top pistons for a 307 V8 are a drop-in fit for a 250, BTW, and they give a pretty good compression boost.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
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