I'm not really familiar with this platform. But I have come across a racer getting out of racing that has 3 of these engines complete and a lot of spare parts. I can get at what I consider a reasonable price. I'd like to chat with someone who is knowledgeable about these engines.
R6/P8 Engine platform
- Thread starter tvt59
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Just be aware that when you're dealing with engines of this type trying to get replacement parts down the road can be impossible, or very costly.
Everything in those engines are custom made to very odd sizes.
What might look to be a deal can be a real deal breaker in time.
Tom
Everything in those engines are custom made to very odd sizes.
What might look to be a deal can be a real deal breaker in time.
Tom
The R6/P8 was Dodge's 2nd generation engine of their modern era. A copy of Chevrolet R06. Built only for NASCAR competition. Many cam, intake, and header combos used depending on track raced. Not something you're going to putt around on the street with. Designed to make power over 6500 up to 9000+ RPM.
I know that they are a short deck engine. I'm wondering what kind of stroke you can get in them? I know Penske used them to win the 2012 NASCAR championship with.
Look at what stroke the GM guys are getting with that short of a deck.
Never ask a Chrysler guy about stuff like this. Most of them are stuck in 1978 and will never find their way out.
Ernie Elliott was repurposing the older R5/P7 stuff, putting in different crankshaft to get right at or tick over 400 cubes. Cranks in those were usually Winberg or some other higher end manufacturer. I'm guessing the same can or is being done with the R6 stuff. Contacting a crank manufacturer is your best bet. Longer stroke, shorter rod. Shorter stroke longer rod.
B3422w5
Well-Known Member
If you are going to go to all that effort, just buy some P7 heads( they go over 400) and mate them to the Ritter block that accepts them..XR2 block. More stroke
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If you go the route your speaking of. its 40 to 50k for one engine. I can get the three r6/p8 engines and all of his spare parts for less than half of that.
B3422w5
Well-Known Member
How do you figure that?
Heads are dirt cheap, blocks are what 5-6k
This ad was recently on here……
[FOR SALE] - p7 heads
A guy had a Duster with a Nascar truck engine in it, out at the local track. It must have had a 6,000 stall converter and sounded like an Indy car engine going through the traps. I don't think he ever got it to hook up. What a screamer.
Even with heads and valves I doubt you can do it for less than 35k, If you go down it line by line you'll see what I'm talking about. The intake alone is 4 to 5k
I think that you can almost put a 4" crank in it and keep it around 9,000 rpm. The valvetrain on those engines are bullet proof. I have all the stuff to build a W7 450" engine. I'm thinking about selling it and buying this R6/P8 stuff
I'm not saying anything you probably don't already know, be prepared for a huge rabbit hole. This stuff sure looks good on paper. None of it bolts directly into an existing chassis, unless of course, you have a chassis car. Nothing was mentioned as to what you want to put this in, it really doesn't matter. Just be prepared for the long road. Sounds like your mind is made up. Post up a build thread if you progress, please. Would be cool to see this happen. I'm still stuck in 1978. 
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B3422w5
Well-Known Member
My buddy had a Dart he ran quite a bit 15 years ago for several yearswith an r5p7 deal. Had a Barton style paint scheme on it, red 68 Dart.
Those motors can be had complete these days for 8-12 grand ready to run.
Buddy ran a 904 behind it with around 7k flash vert. Several people made/ make the adaptor to run the 727/904 with this deal.
His Dart at roughly 3000 pounds went 143 mph, and he didn’t play with it much at all to chase ET.
motor I believe was a Busch restrictor plate motor
9secRR
Well-Known Member
how much HP do you want? how fast you want to go? in the dakota?
R5/P7 is roughly 850 HP and you already have that with the W5. only other option is to get Brett to build you a max N/A 1000+ HP W8-W9 or you jump into the boosted world.
R5/P7 is roughly 850 HP and you already have that with the W5. only other option is to get Brett to build you a max N/A 1000+ HP W8-W9 or you jump into the boosted world.
TT5.9mag
Two atmospheres are better than one
Now you’re talkin!
B3422w5
Well-Known Member
They may say they make that, but the ones I am familiar with in drag cars are well shy of that, based on weight/ mph. More like maybe 750.
ValiantS
Well-Known Member
I have some limited experience on these but, I only did spintron/valvetrain testing and cooling system work. From my memory, I liken them to a precise swiss watch with many small $ pieces. I'd BET depending on who did the original builds would determine the uniqueness of the engine as the r5p7 was the same where pieces weren't interchangeable with Tom, Dick or Harry's r5p7. The block is a premium casting done in England IIRC (not cgi). Generally they made about 50 more HP than the r5p7 but it happened at a higher rpm, as mentioned.
ValiantS
Well-Known Member
You are correct with some versions. I think there were some that made about 850 'legal NASCAR' but, the ones we tested were about 8-825HP.
I'm not saying anything you probably don't already know, be prepared for a huge rabbit hole. This stuff sure looks good on paper. None of bolts directly into an existing chassis, unless of course, you have a chassis car. Nothing was mentioned as to what you want to put this in, it really doesn't matter. Just be prepared for the long road. Sounds like your mind is made up. Post up a build thread if you progress, please. Would be cool to see this happen. I'm still stuck in 1978.
I'm going to race the W5 engine for a couple years braket racing. Then I want to run some 5.30 index. So it'll need to be able to run 5.20 in the heat of the summer.
These R6P8's that I'm looking at supposedly dyno'd at 885 hp in a 358 at 12 to 1 . We think with more stroke and more compression with a cam change we can make 950 hp. It's not a done deal. I'm just weighing options
It's three complete engines and enough spare parts to make a forth one. One engine is fresh the other two are not hurt but are ready for a refresh. They are all from the same shop.
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9secRR
Well-Known Member
sounds like a good deal. if the price is right..... just sayin lol
The family is getting out of racing. I think that I can get all of his R6P8 stuff for less than 20k. All of it came from Penske racing.
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