There has been very few people that have really shown what a R5/P7 engine is capable of. Most guys are buying up cheap ex Nascar parts, rather than starting with new castings etc and doing a full effort build. To that end, it's not an engine that's really proven itself as a drag racing platform.

I think the cost of stroking an R5 is what kills it.

LOL uphill in a parking lot. The sad unfortunate truth of it. Be nice to run at a proper race facility but we will next year. Plan on making some trips back east to run NMCA East NA10.5, of course AFTER the engine gets quite a bit smaller first

I was talking to Ray Barton today, their gen3 426 ss hemi makes 950 hp.

50k to build

David has set the record again at 8.54 at 3400 lbs

Not enough block height for a decent arm.

Needs more like 1075hp to run that number at 3400,950hp @3400 would be an 8.90 0ass.

I wonder if his labor is reflected in this cost or if someone could walk in with 50K and leave with an engine.

Check out Bondobobs stock suspension Dart sport. Went 5.82 1/8 mile. That's high 8's.

Cheap NASCAR parts? Windberg cranks, Lentz rods, JEPistons, Titanium valves, retainers, Jesel valve train. All cheap parts, that's why most mopars don't carry this particular list of brands.

That said, Alan is sort of correct. Buy a used R5 that made 830 new. Worn rings, pistons, valves you still make over 800hp. The 575 torque and high RPM is what limits most from making record passes. I for one have not set the world on fire with little or big R5 engines. But, in fairness, I have really not put the same effort a class racer would. Both of my engines 358 or 440 would go 5.5's at 3000 with full exhaust. The 440 would do so with almost no challenge. It went 5.71 first pass in the car. The 358 would take some work. One get rid of the big motor bogging tires. Second put a 3spd auto or stick in the car and know what converter or clutch setup.

Bottom line I have raced the 358 and 440 at a lot of Mopar shows. No one with a comparable combo was outrunning me. Sure it is easily possible. The average Mopar guy spent more to go slower. I would be happy to sit down and compare receipts. So I get a little tired of people talking down the R5. For the money you can't beat it. Wanna make 900 buy one and spend a little money on it. EEI blocks and 4" cranks are available to make it much easier. My 440 will make 900 on the pump. And it is cheaper to build with available NASCAR takeoffs. Build a all new combo as Ernie has done and 1000hp has been done.

Ray said out the door. By comparison I think an Indy drag pack engine is or was 25k

The Indy Drag Pak motor is a cast iron block 5.7/6.1 hemi with 6.1 heads per NHRA rules. The Barton 426 hemi is a special Mopar crate motor package developed for the NHRA Factory Stock class. It is specially machined aluminum block and Apache heads with a larger throttle body. What Ray and David Barton have done with these motors is truly amazing. They not only have the fastest Drag Pak in the land, they have the fastest Factory Stock car in the land. On a side note, a Drag Pak with a 426 Gen III hemi driven by Kevin Helms won the national championship in NHRA Stock Eliminator this year.

Should make one quick clarification. Barton is the fastest NA Factory Stock car in the country. There is also a boosted class.

Are the Hellcats allowed to run in a stock class yet?

Not yet. This last year NHRA added some new combinations for the Challenger where showroom or street configurations of the 5.7, 6.1 and 6.4 hemis are legal. They haven't approved the street 6.2 supercharged hemi to date. However, the race only 2015 Challenger Drag Pak that came out this year can be ordered with either an NA 426 hemi combo or a 354 supercharged hemi combo. They had to reduce the cubic inches of the supercharged hemi to match the Ford and Chevys. The race ready supercharged Drag Pak will only set you back $110,000.

http://www.mopar.com/dodge/challenger/mopar-drag-pak/

What's the thread title again?

x2, the R5 block with a deck reinforcement plate will accept a rather large bore, get a set of new P7 castings, move the exhaust valve moved over to make room for a larger intake valve, and you got something to work with. The NASCAR port/valve/cam programs were never meant to feed anything more than 358 c.i.

What cam core would be used on the Ritter block with P7 heads?
I'm interested in building a 400" P7 and if it worked this could be a budget way to do it.

It would be a R5 camshaft with a LA style front. They were machining the front of the R5 cores, but depending on what you were wanting to do, a custom core would probably be best.

Lol sounds dirt cheap.
Why wouldn't an LA/R3 cam core work? I thought these were Basically r3 blocks that a P7 head would bolt on. But I haven't gotten to read up on these things much

p7 is a splayed valve so your valves aren`t arranged ex /in/in/ex/ex/in/in/ex. plus they are 6 bearing 60 mm. you can have the snout machined down for a standard cam drive