Saying Goodbye to the 273: 360 Magnum Swap Journey Begins
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- Опубликовано: 24 авг 2023
- I'm finally making room in the 1967 Dodge Dart for the 360 Magnum. The 273 is coming out and I mock up the 360 to see how things are going to fit. We have a couple of fixes to make to the engine mounts so we can get it set on the run stand.
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Hello Telecasterland! Welcome to the channel and thanks for the comment! I definitely appreciate the sub and hope you like the videos.
Nothing wrong with a 273, they put them in the old valiant/ Barracuda. The cool thing about them is that they were the first lA engine and, they have adjustable rocker arms, meaning that if you install a larger lift cam and spring set you can end up with a " little monster " that eats big blocks in the 1/4 .
Ask me how I know😂😂😂 of course I've been rebuilding engines for over 40 years of all makes and engine sizes and applications. But I have to say, the 273 ain't no joke! Superior engineering planning and thought went into that engine to basically last indefinitely with proper care and selection of replacement parts.
I would advise a full proper machine shop rebuild with the addition of balancing and blueprinting the engine. This has 2 main benefits, longevity under severe use and efficiency which brings with it more power and mpg as well . 273s have forged cranks and rods from the factory, all it would take is a minimal overcome with some good forged pistons and ending up at around 10.5 to 1 compression with matching cam, polishing out the ports in the heads with sanding rolls to remove casting flash, a good 3 angle valve job, cc the combustion chambers, installing hardened seats on the exaust valves with sodium filled exaust valves or stainless exaust and intake valves. All these things you can do at home exept the bore , hone, and blueprinting of the block, and milling the deck and head surfaces. Just some thoughts on where you could go with that Lil old 273🤙👍💯
Don't get me wrong! I do not have anything against the 273. mine however needed a trip to the machine shop. At a minimum, it needs a valve job, hardened seats, and bored. The ring ridge is pretty bad. I was also a lot more tight on money when I refreshed it than I am now. I went with the 360 Magnum as it would have cost about the same to build both engines but I get more overhead with the Magnum. My intention for the 273 is once I find a car to put it in (looking at a 68 Barracuda Notchback that would be a good candidate, if it's still around) get it off to the machine shop for a proper rebuild. I want to convert it to a HP build. All it needs at this point is the domed pistons and the right cam. Looking forward to it but gotta finish the Dart first.
if you fail to , port & polish your oil filter , adaptor , you may find oil foaming at the higher RPM’s of your , solid lift flat tappet , 340 🎉
Welcome back @blairlindsay5791. I do not intend to use the 90* oil filter adapter on the 360. I picked up the short filter which, on test fit, cleared the headers with plenty of space. This build is also keeping the stock 5.9L Magnum hydraulic roller cam so it won't be going above 5500 RPM. At what RPM should I be concerned? I am still pretty new to the whole engine swap thing.
If the 273 was originally a 2-bbl, it had a pretty weak cam. The 4-bbl version had a cam around .425" lift and more compression.
@saxmusicmail Welcome and thanks for the comment! This 273 was originally a 2bbl. When I rebuilt it, i put a 318 cam with .390/.390 lift in it. The 4 bbl conversion came later. That could be a good part of why the car was so sluggish. It also really needed a decent valve job which I did not do because of budget......and not knowing what the hell I was doing on my first engine build. I have learned a lot since then and have tried to correct many of the mistakes I made on the 273 with this 360 build. I fear I may have over done it though as the 360 has a cranking pressure between 165 and 175 psi which I am learning is a bit high for the cast iron heads it has on it. I am concerned about detonation on pump gas under load at this point. I am working on learning how I can correct it without breaking the bank at the machine shop or making the engine a complete slug.
@@MontsweagGarage The 273 4-bbl also had a dual point distributor, and 625 cfm Carter AFB. The automatic trans for these was the 727. These 273's were also painted red, with black wrinkle valve covers, not cast, but they had a decorative finned piece on top of the valve covers, and chrome air cleaner. The Dodge air cleaners were chromed, marked Charger 273, the Plymouths marked Commando 273. This engine trim package later reappeared with the 360 on the Dodge Little Red Express Trucks. The name for high performance Dodge engines was changed in '68 to avoid confusion with the Charger car. The high performance engines were renamed Magnum.
@@MontsweagGarage I said .425" lift from memory. Looking it up, they list the 273 cam as Intake .420" / Exhaust .430". I remember it running well with power brakes, but the idle was very lopey. There is an Edelbrock Performer Plus #2177 cam that is nearly identical and gives 16 inches of vacuum at idle. The 318, 340, and 360 can each take a little larger cam and still give good street performance.
@saxmusicmail Thanks for the valuable info. I will definitely refer to it when I find something to put the 273 in. Once it is time to properly rebuild it, I intend to fully convert it into a hi-po by adding the domed pistons and going with an Isky E4 cam which is as close as I have been able to find to the original grind. I already have the carter 625 cfm 4 barrel but it needs the secondary throttle shaft fixed as it has a vacuum leak. I already did the primary one but don't have the proper sized router bit and bushings to do the secondary. I also have the 4 barrel intake. I may have some trouble getting the valve covers and the air cleaner though.
@@MontsweagGarage I looked up the 273 4bbl and it was 10.5:1 compression.
Hello, I have a 1966 Dodge Coronet with a 273 engine, I am changing it for a 360 magnum, the oil pan does not allow the engine to enter, it is very large, do you know if I can put the pan from 273 to 360, will it be okay?
Hello Christian. Welcome to the channel. Due to the difference between the rear seals, you'll need to pick up a mid sump oil pan specifically for a 360. I used this one www.summitracing.com/parts/SUM-G3536. Hope this is helpful.
Thanks, I'll let you know, thanks for responding
@@christianmarquez7487 You are quite welcome.