Wow!

[cudabob496]

I just read in a magazine that you can get refurbished and dynoed NASCAR engines for $12,000 to $20,000! 200 mph, baby!!

[DartGT66]

We have one R5/P7 in the garage. Ours is one race old and needs a rebuild, but was really cheap and the parts needed for a rebuild doesn't cost much. however, it isn't quite that easy. Those engines are purpose built race engines with very narrow power bands, they don't have much use elsewhere. We have an intention to install it in to a street Duster, guess we'll find out how it works. The stories I have heard form other users haven't been too encouraging especially with automatic transmissions. We have the clutch systems for it though, but the owner really would like to use an automatic, and I'm trying to make him go with a five or six speed manual. The problems start with the bellhousing pattern, at the moemnt there isn't anything available for bolting a mopar trans behind one.

[aarracer]

There was a r5/p7 one on racingjunk.com this week for $5000.us It may still be there. Stated it had been raced then inspected!

[cudabob496]

Originally Posted by aarracer

There was a r5/p7 one on racingjunk.com this week for $5000.us It may still be there. Stated it had been raced then inspected!

Whats r5/p7 mean?

[MOPEkid]

There's an article in a past issue of Mopar Action about a street '69 Road Runner that was built by Richard Petty's private pilots that had a rebuilt NASCAR racing engine. They mentioned how they had to start it, didn't seem too practical for a street beast (heat oil, circulate for 30 mins with drill, crank engine w/o ignition for a couple revolutions, then fire it up). They also said it averages around 6 MPG.

[aarracer]

I believe r5 designates the latest release Race Block and p7 the designation for the heads

[DartGT66]

Yes, R5 is the nascar 9" deck block, totally different from any mopar production block, and P7 are the canted valve heads. Here is a P7 head next to a B1.

[70AARCuda]

and it does not bolt up to a 727 or 904......

[DartGT66]

...or any other production bellhousing either. It's a Nascar specific bolt pattern.

[pishta]

Very narrow power band, mate it to a robust CV transmission and cruise around town at 8500 RPM. Could you imagine pulling up to a light and legally taking off in front of an officer at 8500, boomtubes and all? hahaha.

[MOPEkid]

I'd rather build a high-RPM 426 Hemi and put that in a Superbird. Of course, it would probably be at least four times the cost.

[426 Hemi]

The main problem with using the P7 heads is the block...it is too short to stroke it for more cubes. There is an aluminum block available that will allow up to 460 ci. With this block the heads would work much better in a drag car.

[Tarrbabe]

Has a 70 Camaro with a 427 L88 with 5000 stall. Every time he took off on the street it barked the tires. After 3 tickets ( reckless driving ) he lost his licenses and has to sell it.

[DartGT66]

The guy obviously can't drive. I had a 6200 stall in my '66 Dart, and it could be used jsut like any ohter car in regular traffic, even in winter on snow. But a R5/P7 would be happiest with about 8000 stall speed 7" converter. Seems like adapters could be available, no idea about the price yet.
We have started producing these adapters for the 727, 904, and Powerglide trannies to adapt to these engines since their seems to be a demand for them. If you need any, give us a yell.

J.C. Childress
Kowalsky Racing Engines
(434) 821 6107 or 6109

[kick_the_reverb]

The XR-2 block that Kent Ritter is making (very slowly), was designed to take advantage of the P7 heads on a not very exotic block, with tall deck, so the heads would be usable for drag racing.
When will it be available? who knows.
I am waiting for my XR-1 block (uses standard heads), and I have a feeling it'll be a while before I see it.
back to the P7 heads - things can be bought cheap used, however, just price out some replacement valves if you need any, you might change your mind.
Ran