I see that Mahle now has a few Mopar pistons including some that work for stroker engines. One of the choices has a CH of 1.475 so it can work with a 7.100 rod in a RB block or a 6.535 rod in a B block. 1.5/1.5/3.0 mm ring stack. Catalog says 8cc valve relief which seems generous but doesn't give any dimensions.

I was talking to a Mahle sales rep a few monthes ago and they seemed to be pretty aggressive with the American market. Who knows if that'll mean mopar.

They seem to be 4032 alloy, and small rings, which should make for tight tolerances and "pleasant" use, for lack of a better term. The one I was looking at, 1.12CH was seriously light, like 20gm lighter than a Diamond. S/F....Ken M

Yes they do have a 1.12 CH piston designed for 4.15 cranks in a B block with a 440 connecting rod. Personally I'd use a 6.70 Chevy rod in that application but some guys still like the big heavy Mopar pin and rod.

Andy - I PM'd you a link that might be of interest.

Not sure what direction Mahle is going w/ the Mopar market. They've actually cut back on some part #s they introduced for the BBs a few years ago. The 4.375" x 3.75" stock-stroke RB piston like I'd use has been discontinued, although they still offer a 4.350" bore.

I am curious about the valve relief too, 8cc seems very large and makes me wonder if that is effective volume due to not being zero deck since they state compression ratios at different chamber sizes yet they do not state a deck height. Pistons are very light and the price is great considering that they come with rings.

The valve relief is a large symmetrical (same size for exhaust & intake valves) shape, not the asymmetrical design which is tailored for each valve size. That adds some volume, especially when it's cut pretty deep for big cams.

I have not used any of their Mopar pistons, but have used small block Chev and had some custom Cummins pistons made and all was good with them. Very informative and easy to talk to tech...Eric Guirillo(sp?)

Just put together a 512 RB with the Mahle pistons - 520 grams - total 2230 balance - 4.25 stroke with the 7.1 rod - pre-balanced eagle kit - checked out within 1 gram. The valve relieves are symmetrical - I imagine that was a manufacturing choice to avoid a right and left piston.

I have them in at .010 in the hole - will end up with a 12.75-1 with a set of EZ-1's. These pistons come with the skirt coating and are fit at .004-.005 wall clearance - so you run them on the tighter side. Valve clearance is a abundant with the .670 roller I am using - exhaust was around .240 as I recall

Have not fired it up yet - but the quality of these pistons is amazing for the price

I have ran a couple, very light weight, anti friction coating, rings included, hard anodized all over, very nice piston for the money. The only complaint I had with one set in a SB stroker is the dished piston has a huge dish (28CC I think it was) and very little quench area, I like a large quench area and a little higher compression than most guys will run. That 416 made an awesome tow truck engine though.

The engine builder I work with really likes the Mahle brand but I've never used them myself. I didn't even know they had Mopar stroker pistons until just recently. From what I've seen so far it looks like Mahle provides a better product than what is used in most of the Mopar stroker kits. The Mahle piston has the friction coating and metric rings. Only downside is that they only have about 9 part numbers for big blocks. They do have a fair number of SB pistons including some for 4 inch strokers.

I think they have 2 not counting oversizes, flat top and huge dish for 4 inch with stock pin size. They make a flat top 360 stroke piston and a 340 stroke flat top.

Mahle in one of the largest (if not the larget) OEM piston manufacturers in Europe, so the tooling and maintenance is always world class so for the price point you're buying top quality ISO standard components.

The downside is because of their target market will naturally lack customization and as such you will lack choices in terms of Valve notches/Compression heights, etc.

They have a relatively new manufacturing plant right here in North Carolina so there is some element of supporting the local economy for me too.

In Kits ordered from Eagle with Mahles for stroker bb mopars I have had two with the wrong oil ring expander--called Mahle the first time--they said nip the expander and keep rolling--I have done it before so no big deal did it and rolled on--they had less tension than I would have liked but....
Second time I got weird oil expanders, I had been hearing from other builders about this so called Mahle again--tech guy said I was NUTS to nip those expanders and was not an engine builder etc--OK...( he may be right--who knows)I just ordered some CORRECT rings from Total Seal and solved the problem--that-- and Eagles kits are FT and do not offer the correct dish volume for many street CR builds so I am done with the Mahle--for now--
Everyone is going crazy for skinny rings--I know they make a little more HP but really--the 3.0mm oil ring is very easy to screw up and for a once in a while home builder I would say very easy to ruin the oil rings on install and for what? a few extra HP on a big street stroker that is if anything over muscled to start with for average guy--give me plain old 1/16th foolproof anytime--all this chasing a few extra HP at every single turn is driven by internet chats and chatter--anyone in the world would / should be pretty happy with any sort of BB Mopar stroker with decent heads--as a street ride. They all drive like the Zamboni at the skate rink anyway --
I don't even pick up any magazines anymore--if you don't have over 800HP they think you are not really engaged in the hobby--I mean 1200HP articles and turboed this and that is all they write about--bet half the guys in the world would near have a stroke if they rode in a real 600 HP street car.
I still think a real 500 HP Mopar is a beautiful unit on the street and stays well within the limits of a real Mopar car--