Article

http://www.hotrod.com/articles/new-life-for-mopar-383-big-block/



The tight budget also demanded reuse of the stock stamped steel rocker arms, not a bad thing since they’re stable to 6,000 rpm. The Stealth heads come equipped with single 330-pound valvesprings (safe to 0.510 lift), 7-degree locks, and chrome moly retainers that are all supplied to 440 Source by Comp Cams. To prevent deflection with the stiffer springs, the stock 0.310-diameter SAE 1065 steel tubing pushrods were replaced with 3/8-inch chrome-moly items from Comp (PN 7934-16).


I am about to find out this summer with my 432 Stroker Kit

I will bee running the E Street Heads 75cc , Comp Cams XE275HL , and went from the factory used 47 year old rockers and replaced them with the Sealed Power Rocker Arms and Shafts

The Sealed Power Stamped Steel Rocker Arms are thicker steel when i measured them compared to the factory rockers

I have two friends running the 440 Stealth Heads , Comp Cams XE275HL , and the 440 Source 496 Stroker Kit on the street the last few years running factory rocker arms with zero issues