I am getting ready to re-install my Eddy RPM's, which were just done by Jeff @ Modern Cylinder( They Look Great!! Thanks) I am changing to the Crane 1.6 rockers and was wondering if the pushrod opening needs clearanced before I bolt on the heads. I am waiting for the rockers now( from Moparts Member), so I can't test fit. I am sure somebody has done this before, Thanks for your help!
Edit( Cam is Comp Cam solid just around .586 and .591 with 1.5 rockers)

Its going to depend on how much clearance you had before,
the 1.6 moves the pushrod in closer to the head, I
would check it anyways... full lift gets closer,
specially with a big lift

We're running Edelbrock RPM's with 1.6 Crane Rockers and we didn't have any clearance issues with the 3/8" pushrods. We're using an MP .484 cam also.

Any time an engine component is change clearances should be checked IMO. Your engine and aftermarket part combination's are unique to your build, variables are bound change fit and clearances. Paying close attention to every detail when building an engine is always very important. My

Jeff didn't open the pushrod hole up when he ran them through the CNC program? He ported ours a few years ago and the pushrod hole was opened more also.

mock it up before final assembly.

My heads are from MCH and didn't require clearancing. I have 1.65 int and 1.6 exh HS rockers. I have .025 or better clearance down the pushrod hole across the board w/ 3/8 pushrods. However, I've seen another MCH set that needed clearance with 1.5 rockers. I believe mine were clearanced. U might want to check with MCH as you mock up.