I have not changed the push rods in my 5.7 for ether cam change, my resigning for this is the stock factory valve springs for the 5.7 Eagle have over 400 pounds per inch of spring pressure. The stock 6.4 along with the Mopar performance and the PSI 1511ml springs that I used all have spring pressures in the 380 pounds per inch range. The 5.7 Eagle and 6.4 Apache both use the same part number push rods. I just figured if Chrysler made them strong enough for the 6.4 cam and 6200 rpm shift point of that engine they should be strong enough. But many tuners and mechanics think they are not, so that is up to you to make that decision. I put the 6.4 cam and valve springs in my Challenger at around 10,000 miles and the custom cam in at around 45,000 miles, the Challenger now has over 50,000 mile on it with the rev limiter set at 6800 rpms with no problems with the engine. Now that TR6060 6spd trans that a whole nother story, I would never buy a car with one of thoughs again worst shifting trans I ever owned. Fought Chrysler throughout the whole warrenty to replace it and just bought a low mileage one to replace it( not cheap), I am not going to wholed my breath over whether its better or not