340sFastback
Well-Known Member
I think I am going to run the engine, shut it down, and carefully adjust all the valves. See what that gives me.
you may have some oil up top, but it might not be enough... i would swap out a factory bolt for the stud where the oil comes up as an experiment.
i wonder if too much preload can cause the lifters to be noisy because the plungers arent up on the retainer clip and when lifters go down hole the plungers tap when the plungers released and hits the retainer. by retainer i mean the clip at the top of the lifter
Were the lifter bores bushed? Is it possible that the oil goove/hole in lifter is coming above lifter bore when cam is at max lift. Have heard of that happening before. Just a thought
340s I had a set of comp Magnum rockers like you have there and also used their pushrods and at first the pushrods I had were a little too long so I had to back the adjuster out to where only about 1 thread was showing so as to not have too much lifter preload and it was real noisy like yours. I found what was happening was the pushrod cup on top was contacting the rocker arm at full lift. I swapped the pushrods for shorter ones so then I had about 2-1/2 threads on the adjuster showing and the noise left because the pushrod cup no longer hit. You might have a look at that.
Are you using a windage tray? Could the rods be hitting it?
What brand are the lifters ? There have been alot of problems with the Comp lifters. Apparently they do not do a good job of de-magnetizing the bodies after maching them and it causes the valve inside to stick to the bottom and not allow enough oil to get inside.The cure for this is to remove the lifters from the engine and take them to a machine shop that can de-mag them for you,any shop that has a machine for magging cranks can do this.If it is a Crane they recommend .090 preload ,which is about 1 1/2 turns,it should have stated that in the instructions.
Any luck on pulling the dipstick out?
Fishy, the top of my push rods have a ball end, no cup. The Comp Cams Pro Magnum rocker arms come standard with a ball end adjuster on them. To run a cup type push rod the adjuster would have to be changed?
OK
This is something to look into, rather than just take me at my word, because I cant seem to find my source.
I seem to recall reading someplace that the link bars on the retrofit lifters have to be facing inwards towards the cam, rather than towards the cylinder head. Is it possibly that the link bars are hitting on something?
Also, is that a Cobra R in the background?
I read the post on Moparts... I didnt realize they might want that much, but hey, stranger things have happened. So long as the noise goes away...
The last time I ran a hydraulic roller I went though the samething The cure was 1 to 1 1/2 turns of preload witch is .042 to .060 preload with a 3/8 24 thread adjuster. Chrysler had the same problem with there first roller motors in the late 80s. They recalled the 318 and put longer pushrods in them. The only other thing I can think of is if your lifter and pushrod have the holes for oiling through the pushrod you could be bleeding off to much oil pressure to the top end.