The RPM and valve spring pressures have a lot to do with my decision making, my next all out race motor will get the Jesel belt drive I have sitting on the shelf now, that 555 C.I. Koleno block with a set of B1-MC heads and either a set of Jesel 1.7 ratio paired rocker steel arm set up or a set of T&D set up like the Jesel set up in steel also. The last time I talked to the current parts tech at Jesel a year and 1/2 ago told me they don't make or sell any BB Mopar paired shaft rocker set ups for Indy 440-1 in steel, he didn't have a answer when I told him the part # for the current set of 1.55 ratio steel rocker arm paired shaft set up I have on my other back up bracket motor with those heads that came with the steel Jesel paired shaft rocker arm set up
T&D does offer them and will make them when you place the order