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Jul 21st, 2025 | | | | Joined: Sep 2006 Posts: 4 New Guy | | New Guy Joined: Sep 2006 Posts: 4 | Hey all,
I am new to the world of inline 6s and need some help. I recently aquired a 62 C10 Stepside with the motor and tranny sitting in the bed. I dont know if this is the original engine and trans, but I am going to try to get them up and running none the less. My question is, is this a 230 or a 250? Heres the numbers I found on it. Drivers side: CON2 D177 3877178 GM 44. Pass side: 34 7178. From Inliners.org the 3877178 means its a 62-78 230-250 from Buick, Olds, chevy, Pontiac or GMC. Any and all help is greatly appreciated. Thanks | | | | | Joined: Feb 2007 Posts: 513 Shop Shark | | Shop Shark Joined: Feb 2007 Posts: 513 | i would think it would be a 230 if it came out of that truck
1949 Chevy 3600 Flatbed all orginal 1964 gmc 4000 1973 gmc 6000 2005 chevy duramax 4x4 1994 chevy 1500 Trucks are GM and Tractors are Orange "I don't measure a man's success by how high he climbs but how high he bounces when he hits bottom." - General George S. Patton | | | | | Joined: May 2004 Posts: 920 'Bolter | | 'Bolter Joined: May 2004 Posts: 920 | 62 was the last year they used the 235 and the only year that the 261 was available as an option in light duty trucks. If it is a 230 or 250, it's not the original motor. They started using those in 63. | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | 62 came out with the old stovebolt 235. If the numbers show it,s a 230-250 it,s not the original engine.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Sep 2006 Posts: 4 New Guy | | New Guy Joined: Sep 2006 Posts: 4 | OK, now its starting to make more sense to me. The fact that its not the original engine doesnt really bother me all that much, but is there a way to decipher between the 230 and the 250? Thanks for all of the information and keep it rolling in!!! | | | | | Joined: Mar 2007 Posts: 27 Apprentice | | Apprentice Joined: Mar 2007 Posts: 27 | Hawks62, I just recently went through the same thing with my L6...trying to determine a) if it was original and b) what the cube was. There are very few visible differences between the 230 and 250. This might vary per a given year, but for example in 1966, the stroke on a 230 is 3.25 and on a 250 it is 3.53 (Source MOTOR Manual 1967). You might try the suffix code, which is a two or three letter code that trails the engine serial number stamped into a pad just aft of the distributor. There are a couple of websites you can Google for suffix codes. Most of them are V-8 only, but I remember finding one or two sites that had L6 suffix codes. Here is one example: http://www.chevellestuff.com/69velle/69engine.htm | | | | | Joined: Jan 2001 Posts: 662 Shop Shark | | Shop Shark Joined: Jan 2001 Posts: 662 | | | | | | Joined: Jan 2007 Posts: 48 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2007 Posts: 48 | Good info, ChuckTheTruck. For a long time I thought the 250 was new in '67. Now I see it was new in '66. Never too old to learn something, believe you me!
Joe
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'67 Chevy C20 fleetside, 250 inline, 3 on tree, heavy duty clutch and brakes, heater, steel bed floor
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"Tighten until the stud snaps, then back off half a turn."
| | | | | Joined: Sep 2006 Posts: 4 New Guy | | New Guy Joined: Sep 2006 Posts: 4 | I just received my Chevrolet Inline-Six Power Manual by Leo Santucci (an excellent source for inliners) and he states that the 230 and the 250 are identical except for the the stroke. The 230 has a 3.250" stroke while the 250 has a 3.530" stroke. So I plan to measure this today and find out just what the heck I have. Thanks to everyone who has responded. | | |
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