I was told by a sales manager at Duluth Dodge that he has a slant six engine with approx. 60k miles just laying around from when he swapped a 340 in his 1966 "something" (don't remember what it was) and he said he'd love to sell it to me. I didn't ask at the time which engine it was, and I'm hoping he knows. If he doesn't, how would you tell which engine it is? Running the VIN? Or is there something on the block that should tell me what engine it is? I am needing a 225, so I'm really hoping that's what he has.

Also, would I be able to drop that engine in my '77 truck with no modifications if it is indeed a 1966 225 engine? Are they any different than the engine in my truck?

Thanks for your help!

-Brodie

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-Brodie

1977 Dodge D100 stepside, slant six/3 on the tree
2002 Chrysler 300M Special (daily driver)

As I recall and if I am wrong I am sure someone will chime in the block is stamped under the number 1 spark plug. It will have the serial number and engine size assuming it has not been machined off. Second the oil pan and pick up are different one earlier slants then later so you would have to transfer from your existing engine. As far as mounts I don't know if you can use the mounts as in later years there were changed to spool mounts but the mounting location is the same you would need to transfer your spool mounts over. Also the snout on an automatic early slant is smaller then the later engines you may need a torque converter.

The larger concern is how long has the engine been sitting. You may be able to drop it in but if it has not been maintained for a lot of years it will likely need freshening up. Plugs, wires, gaskets, oil, There are lots of things that need to be looked at.

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2006 Jeep Commander
2013 Chrysler 200

1964 Valiant 4 Door
1965 Plymouth Barracuda
1967 Chevy Camaro

It is not easy to put a 67 or older slant six engine into a 68 or newer vehicle, if using an auto trans. It can be easier if the truck is a standard shift. The difference is in the pilot hole diameter in the end of the crankshaft. The hole got larger in 1968, as did the locating flange, so the later torque converter, and/or flywheel will not fit. With a standard you would need to find an early flywheel to match the engine, or get a locating ring made, to use your late flywheel. With an auto you need a special torque converter to match the early engine and the late trans. There are some other parts that need to be swaped from your late enine to the early engine, as stated.

As for your original question. In 1966 the engine would be either a 170 or a 225. A 170 has a water pump bypass hose about 1 1/2 inches long. The 225 has a hose that is about 3 inches long. As for a 198 (could have been swaped in sometime or other,) that looks the same as a 225. The only way to tell is by the number on the pad or by opening up the engine.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Is there any advantage to a pre-68 engine or would it be best to just look for a post-68 engine to save the hassle? I have a standard 3spd so it would be easier for me in that respect. If best to look for a post-68, are there any years that are better than others in terms of hp/tq numbers? I'm sure the early ones are a bit more powerful than my '77 is. I do have a complete Super Six setup that I havent installed yet, so that should help to some degree.

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-Brodie

1977 Dodge D100 stepside, slant six/3 on the tree
2002 Chrysler 300M Special (daily driver)