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Mod | | | Forums66 Topics128,154 Posts1,056,856 Members48,456 | | Most Online14,466
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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Jul 2009 Posts: 8 New Guy | | New Guy Joined: Jul 2009 Posts: 8 | How can I figure out what engine was originally in my 61? Also anyone have good link for rpo's. | | | | | Joined: Sep 2006 Posts: 841 Shop Shark | | Shop Shark Joined: Sep 2006 Posts: 841 | | | | | | Joined: May 2009 Posts: 6 New Guy | | New Guy Joined: May 2009 Posts: 6 | Look at the HP rating on the tag located at the left kick panel.
I can look the engine up if you don't have any reference books or manuals. | | | | | Joined: Jul 2009 Posts: 8 New Guy | | New Guy Joined: Jul 2009 Posts: 8 | Thanks turbo. Can't yet read all the tag but I can read rpos as 432a and 740j. I guess that is paint and trim. | | | | | Joined: Dec 2001 Posts: 14,522 Moderator: Welcome Centre, Southern Bolters, Legion Hall | | Moderator: Welcome Centre, Southern Bolters, Legion Hall Joined: Dec 2001 Posts: 14,522 | .... is there an engine in the truck? If so get the engine # and see if it coincides with the truck. That would be a good way to start. | | | | | Joined: Apr 2008 Posts: 211 Shop Shark | | Shop Shark Joined: Apr 2008 Posts: 211 | It's probably got the 7.3 Powerstroke...BAHAHAHAHHAHAAHHAHA God forbid!
| | | | | Joined: Feb 2002 Posts: 2,893 Socket Breaker | | Socket Breaker Joined: Feb 2002 Posts: 2,893 | | | | | | Joined: Aug 2007 Posts: 67 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2007 Posts: 67 | My bet is if it is a 1/2 ton it proly started life with a 235. And yes 432a and 740j are paint and trim codes.
1947 1Ton stepside
1962 K20 Fleetside
1962 C40 12' flatbed
1963 C10 Stepside
1963 C20 Fleetside
1965 C10 Stepside (Daily Driver)
1973 C20 Stepside fire truck
1973 C50 Utility truck Houston Power & Light
| | | | | Joined: Mar 2008 Posts: 55 Shop Shark | | Shop Shark Joined: Mar 2008 Posts: 55 | really simple the 6 cyl engines have a front mount bracket welded to the front of the crossmember. The V8 engines mounted with side mounts. a bracket bolted to each side on the center of the crossmember. OldWolf | | |
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