small block heads questions

Our dyno headersa re 1 5/8 to 1 3/4. The rockers were Comp rollers. Hollow oil thru lifters are a lot lighter than the std soild Mopar lifters. Plus we can run a oil thru pushrod which allows use to get a little more oil at the rocker adjuster(high pressure point) and it keeps the pushrod full of oil. A pushrod full of oil has a lot less harmonics than a hollow pushrod with nothing in it.

Hit a metal tube with a hammer that has nothing in it, then fill it with water or oil or some other kind of liquid and hit it again. get the picture?

The 596 heads and the J heads are pretty much the same. I dont give a nod to either one. Going BIG on the intake valve is not your best bet. The port wont support the valve size. Keep it on the smaller side and it will run pretty good. We used a 1.94" on that 416.