I bought a Dodge R5P7, time to get to work!

[@craigcontofalsky4387]

I used to race a 340 Super Stock Duster and Demon back in the 70's. Back then the W2 heads were some of the best heads. My one buddy picked up a experimental set of 340 heads from a factory sponsored guy but I never got a chance to see them. Not sure if he ever completed that engine as the W5 aluminum heads were then the hot setup. Things were the best one day and obsolete the next. Glad you're putting out these videos because I've seen pictures of the complete Nascar Mopar but never disassembled. I'll be following your progress. I still have my 71, 340 Demon 4speed with 14,355 original miles. Mostly stock with a bigger street cam.

[@drcolster]

Try Eatmon Race Engines.... heads are copy of Chev SB2 layout... good engine..we have many here in Australia...

[@79tazman]

Yeah they have a few R5p7 engines all fresh and complete for $16 and a half thousand dollars

[@davecaresforyou7606]

Wow those are some huge valves

[@79tazman]

You can buy a complete R5p7 from Eaton Race engines out of Wilson NC for $16,500,000

[@duanerogers1529]

Nice video. Waiting to see the build.

[@moparmuscle8749]

Thanks Duane! I'll be getting to it soon, the block and heads made it to the machine shop this weekend. Video will be out on that soon!

[@PiDsPagePrototypes]

Looks like a fun project, and probably easier to get parts for then one of the other open decks from Chrysler - the Aluminium Slant Six - but the manifolds and the like will be as hard to find as original HyperPak units. Will be fun in the Duster, you'll need a custom K-Frame to take advantage of the dry-sump designs extra clearance - getting it lower in the chassis will help a lot for cornering and controlling weight transfer on launch. The 'Feather Duster' model had stamped aluminium hood and front quarters, if they fit yours that will help with moving mass rearwards for better traction off the line. Don't let anyone put you off with whining about open deck - it offers better cooling for race applications, and when the bores wear to where they can't be machined, you cut them out an convert to Wet Sleeve and go bigger in capacity with no one noticing,... :)

[@tyeschaefers4251]

I am eager to hear about the history of it.

[@adamhigham]

More info on these would be great as I have one in my valiant .It was rebuilt be eatmon racing engines ex penski team engine.

[@moparmuscle8749]

There are a couple more videos on the channel with a few more details but let me know what you'd like to see and I will try my best. There will be much more engine detailed content coming once I have the block back from the machine shop and we start assembling.

[@phonebackup8132]

Reminds me of the poly head.

[@maldo72]

cool stuff subbed for more updates

[@kylehorner2896]

DO A BURNOUT!!!!!! (🥇 comment on Moparmustle87) Can't wait to see more of the R5 build!

[@moparmuscle8749]

You'll see many of those ;)

[@adamrodgers2377]

Man those heads ought to flow some crazy numbers, can't wait to see this progress. Have you thought about a turbo 😈

[@moparmuscle8749]

Haha the idea has come up, I do have a spare S475 in the garage. My thought was eventually putting a blower on it since this engine won't make a ton of torque down low due to its short stroke. But the first leg of the build will just be high RPM NA power for now.

[@petesmith5092]

​​@@moparmuscle8749 Some people would have you believe there's no replacement for displacement, I argue that RPM is an excellent replacement for displacement. Then there's the weezers. Another alternative✌️🍺🍺🍺😆😝😛 Edit: Oh yeah, slick Duster..🏴‍☠️ Thanks for the post

[@robertheymann5906]

Awesomeness

[@kpgsx]

I am building a LA318 X-block with a s475....and a T56....hmm, small world. 🤔

[@davecaresforyou7606]

Where did you find that and how much do they run and oh how much power can they hold

[@ComputerCapone]

You bought a r5...im sorry. Hope you have alot of cash and about 5 to shelf machinist. Your gonna need them.

[@rtkl13]

It's not as easy as it looks that's for sure

[@SeanOBryanZZ]

Dude I'm so jealous! Are you going to run the dry sump

[@moparmuscle8749]

That is my plan! The R5 blocks don't actually have an oil pump provision in the crank case like a typical small block so it would be tougher to modify it and make a wet sump work rather than to just find a dry sump pump.

[@jamest.5001]

It's like a BBC head, can't believe they went open deck! I guess with a open deck, it needs 6 bolts per hole, very interesting, I'm not a dodge guy, drive a dodge, but better than a Ford anyway! 😆, Still cool, I'd brase up that hole, it is iron? But still can be fixed, the guy who caused the problem would never touch my engine ever! If you check a bearing like that, you have a TQ wrench in hand when you do it!!

[@moparmuscle8749]

The open deck is to help cooling efficiency since Nascar engines experience very high water temperatures. Not the best for cylinder sealing but you're correct, that's where the 6 head bolts help out. The block is regular gray cast iron so it's best not to weld on it, you'll see how we fix it without welding in an upcoming video!

[@Mccleje11]

Would you sell the Duster ?

[@davecaresforyou7606]

How much power can the blocks hold

[@moparmuscle8749]

The blocks seem fairly stout, there is quite a bit of iron in them. I have seen turbo builds up in the 14-1500hp range. I am not sure what Dodge's design limits were but these engines made 8-900hp NA with reliability. I question the limitations of the Siamese deck particularly at the 1000+hp levels or with large amounts of boost.