Mahle makes excellent pistons but they don't have many choices for BB Mopar engines. We push most customers into Mahle pistons if they carry a good one for the customer's application. Mahle has a very big line of Chevy pistons and they even have a lot of great Ford pistons but Mopar just isn't there thing. You can get a good 505 piston from Mahle but compression ratio choices are limited. I'm using Mahle pistons in my the Ford 521 that I'm building. They are great pistons, just don't expect a lot of choices for a Mopar.