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Rebuilt Chrysler 251 Inline 6 Flathead Engine
Dodge Chrysler 251 Inline 6 Flathead Engine

Chrysler 251 Flathead Inline-6 Spitfire Engine Rebuild

Dodge Engines, Remanufactured Engines 42 Comments

Chrysler Dodge 251 Straight-6 Flathead Spitfire Engine Rebuild

Vintage Chrysler 251 engine in for a complete rebuild.  A cast iron beast L-head six cylinder valve in block model.

This Straight-6 250.6 4.1L engine model is from 1942-1960 Chrysler Dodge with 25 inch block and head.  Fits various models of 6 cylinder Truck “L” head and Industrial applications.  Block number on engine is 1138129.
Model: 251 / 250.6 4.1L 12V L6 Flathead
OEM Bore: 3.4375″ / 3 7/16″

Lot’s of elbow grease for this engine.  On the Machine Service agenda: Bore, Hone, Deck, recondition Crank, Cam, and Conrods.
Here’s a few photos before the rebuild.  Teardown and Inspection phase.

Dodge Chrysler 251 Spitfire Flathead Engine

Chrysler 251 L6 before rebuild

  • Chrysler 251 Engine before rebuild
  • Teardown Chrysler 251 engine

Inspection didn’t reveal any block or head issues, which is good news.  Time to hot tank these parts and get them cleaned up.  Crank and Cam need a grind and polish.  Gotta recondition the connecting rods and clean up the tubing and other parts.

MACHINE SHOP SERVICES

Cylinder Head Repair

Not much to this cast iron L-head, all the goodies and moving parts are in the block.  We clean it up, get all the nooks and crannies, and seal it with a coat of paint.  It’s ready for the resurfacing machine to give it a nice smooth finish.  Since we are decking the block the mating surface is going to be a great fit.

Block Work

Photos of the engine block after we Bore, Honed, and Decked it.

We are checking all the bolts for straightness, verifying valve seat integrity, and all ports.  New engine parts ordered in correct sizes, soon we will be assembling.

Short Block Assembly

Once the block work is complete, we give it a few coats of paint to seal it.  Time to install the valves, springs, reconditioned crankshaft, camshaft and connecting rods, bearings, timing set, and little extras.  New pistons and rings.

This Spitfire is coming together nicely.  Ready to add the last elements, like the new Oil Strainer and tubing.  Then we can bolt on the oil pan and the cylinder head.

Finished Product

CHRYSLER 251 SPITFIRE LONG BLOCK

Remanufactured Chrysler 251 Spitfire Engine

Rebuilt Remanufactured Dodge Chrysler 251 Engine

Dodge Chrysler 251 Spitfire Flathead Engine

Do you need your Chrysler 251 Engine Rebuilt?

Chrysler 251 Engine Builder
We Rebuild Chrysler Dodge 251 Engines!

Engine Parts and Machine Services available.

Call 818 767-6603 or use Contact page for email.

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42 Comments

  1. tims
    January 27, 202111:01 am -

    Can you do a rebuild of a 218. I have the original block from my truck which I’d like to use. It was a low mileage motor that I disassembled. The bore is stock, with a .005 – .007 or so ridge.

    I have a running 230 in my truck right now, and I want to use the crank and rods in my original block to keep the displacement. Also the head is a better design.

    Can you send me a quote?

    Thanks.

    Reply
  2. Mark Gilbert
    July 21, 20202:56 am -

    I have a 251 in my 1950 Chrysler royal. Can you please email me a quote for a rebuild. Thank you!

    Reply
  3. Kammy Sutherland
    July 18, 202010:43 am -

    I have a 1952 dodge pickup with a 218 flat head 6
    Would like a price on a rebuild. Thanks

    Reply
  4. Nikola Vouk
    May 9, 20202:47 am -

    Hello,
    I have a 1946 Windsor. Could you send a quote on Rebuild on a 46 windsor flathead 251 please.
    Do you also rebuild the fluid drive transmission? Would you have a quote for the transmission rebuild too please?

    Reply
  5. Mark B.
    March 18, 20207:08 pm -

    I have an all original 1948 Chrysler Windsor Sedan with an in-line 250 Spitfire , low low miles as the car was parked in garage since 1975. I inherited it a month ago and figured best to have a rebuild and thoroughly gone through seeing as it hasn’t been run in over 45 years. I have the car in Paso Robles, but can and am going to pull the engine while the car is restored, please send me a quote to go through and freshen the engine.

    Thank you

    Reply
    • Valley Auto Parts
      March 20, 202010:34 am -

      Mark,
      I will email you an estimate to rebuild your Chrysler 250 engine.
      Regards,
      Lucinda

      Reply
    • louis rendek
      May 29, 202110:26 am -

      Hi Mark.

      I am looking at a 1948 Chrysler Windsor which might need an engine rebuild?

      It is a 251 cu, in.

      Could you please let me know what it cost to rebuild your engine.

      Thanks for your help,

      Lou

      Reply
  6. David Rios
    February 3, 20205:54 pm -

    Can you please send me a quote for rebuilding my Chrysler 251 Spitfire, it runs real nice. thanks.

    Reply
    • Valley Auto Parts
      February 4, 20209:24 pm -

      David,
      I emailed you an estimate to rebuild your 251 engine.
      Regards,
      Lucinda

      Reply
      • Richard Hughes
        February 18, 20205:24 am -

        Hey there I got a 46 Dodge Power Wagon with a 25 inch head so I’m assuming it’s a 251 engine how much to rebuild that I’ve got low low to no compression on 3 cylinders what’s your thoughts Richard Hughes New Smyrna Beach Florida 32168 xxxx or do you have any blocks that are ready to go also when I crank this thing up I kind of noticed a little bit of oil wanting to go to the top of the radiator any ideas where that would be coming from thanks

        Reply
  7. Jeremy Miller
    February 2, 202012:01 pm -

    I’m lookin for a 251 exhaust manifold any tips or location to locate one would be great

    Reply
  8. ronald lobb
    September 29, 201912:00 pm -

    Kaiser 47 with Continental 226. Cost to rebuild? Suitable flathead swap in your inventory?

    Reply
  9. Jason Berger
    August 15, 201910:03 pm -

    I have a 251 flat head engine that needs to be rebuilt.it still runs,just has lots of time on it.how much,to rebuild through u.

    Reply
  10. Terry Barth
    August 13, 201912:05 am -

    Hi , I have a Spitfire engine, it hadnt ran in years have it fired up and running, sadly it is sucking coolant and burning it as well as going into the oil pan. What woud the cost be too rebuild it? thank you Terry

    Reply
  11. SD
    January 11, 20194:21 pm -

    Quote please!

    Reply
  12. justin sevigny
    December 10, 20187:32 pm -

    Hi Im looking for a quote to rebuild my 1947 250.6 spitfire engine is it possible for you to get one to me

    Reply
  13. Gary
    October 27, 20185:41 pm -

    Could you send me a quote on a 265 Spitfire rebuild? Thank you.

    Reply
  14. John Mcmurtrie
    July 9, 20186:30 pm -

    Interested in quote for same motor pmease

    Reply
  15. Dwight Hochbaum
    June 9, 201810:51 pm -

    Hello, I have a 1948 Desoto 236 flat six. How much is a rebuild and do you have a warranty?

    Reply
    • Valley Auto Parts
      June 11, 20189:38 am -

      Dwight,
      I emailed you a quote to rebuild your DeSoto 236 engine.
      Yes, all work is warrantied.
      Long blocks are 1 year/12k miles for non-commercial use.
      Thanks
      Lucinda

      Reply
  16. TG
    May 30, 201812:48 pm -

    Hello! Can you email me a quote for rebuild?
    Thanks!

    Reply
  17. Warren
    May 26, 20187:15 pm -

    I would like a quote for this rebuild also.

    Reply
  18. Steve
    May 20, 20183:04 pm -

    Hi Could you send me a quote also. Thanks

    Reply
  19. Richard Conley
    March 15, 201812:48 pm -

    How much does it cost for rebuild dodge inline flat head

    Reply

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