Hi all,
In my quest to have my engine assembled before I deploy, I seem to run in to all sorts of problems. Of course, that's the fun of the game!
Anyways, I have my 250 (230 block, 250 crank, 307 pistons) with my head (Tom's work, lump ported, longer valves, etc etc) and roller rockers (Comp Cams). I am trying out the Ford 300 pushrods (10.14 length) since I could get them overnight and can return them if need be.
I went to set my pre-load and when twisting and tightening they would stop, but after a couple seconds be loose again. I could do this for about a full turn before they would no longer loosen after setting. I had put some assembly lube on the lifter & rocker, my thinking is that it was pushing that out of the way and once the oil moved the pushrod would spin again.
After getting to where the pushrod wouldn't spin, I backed it off slightly to get it to just spin, then went a full turn as per manual.
However, I swear the rocker was pushing the valve slightly down when I was doing the final turn. After doing a bunch of reading, it seems like the full turn is heavily debated. I do have a very mild cam in it, not sure if that's causing it.
Anyone have any suggestions? Any way to physically measure the preload vs doing the spin & tighten drill?
