505 Stroker woes, comp lifter failure, hammered rockers

[GrabberOrange69]

Here's a pic of some of the rockers.

As a rule of thumb, I'd have no more than 3 exposed threads on the adjusters. The one on the right has 5, the one on the left has 3. From this, I can surmise the valve tip heights, or push rod lengths are not uniform. Most folks don't fully appreciate the tremendous forces and pressures involved in the valve train, obviously your machine shop doesn't either. On our wedge MOPARS with rocker shafts, its even more important to get the valve lengths uniform across the back when the valves are seated. Then you can adjust with a set of uniform, custom length push rods, in the correct diameter for your rockers (5/16 or 3/8).

What spring pressure were you running? High RPM with inadequate springs can wreck havoc on power and valve train equipment.

 

[Jung]

As a rule of thumb, I'd have no more than 3 exposed threads on the adjusters. The one on the right has 5, the one on the left has 3. From this, I can surmise the valve tip heights, or push rod lengths are not uniform. Most folks don't fully appreciate the tremendous forces and pressures involved in the valve train, obviously your machine shop doesn't either. On our wedge MOPARS with rocker shafts, its even more important to get the valve lengths uniform across the back when the valves are seated. Then you can adjust with a set of uniform, custom length push rods, in the correct diameter for your rockers (5/16 or 3/8).

The pushrods were all different lengths! - they also weren't drilled properly for oiling!! I measured up for new custom pushrods for the erson lifters and when fitted the adjustments were identical across the head.

 

[wyrmrider]

I'd cut the oil filter apart and check
if they used a belt sander they might have used scotchbright- which is death well they both are death
belt sander on the heads usually leads to one end being cut more than the other
If you have the heads off measure the thickness of all the short head bolt casting areas - should be about an inch but they should all be a same
you can also depth mike the chambers - are these open chamber like 68 and later or closed (wedge) heads like the 512 and 915
interesting piston machining - any idea whose?
having 3/8 adjusters for 3/8 balls and cups is special I sometimes use Ford 3/8 adjusters and cup instead of ball adjusters but as I said- special
btw any other of you are not using early small ball solid or Hyd FT lifters and pushrods do not use and do not mix and match
there is a reason Ma Mopar switched to the larger cups and balls

counting threads does not work anymore as the length of the distance from the ball to the threads has increased for most adjusters
YMMV you want the ball as close to the rocker as possible
and if roller tip rockers you need to read the 4 part series at B3
http://www.b3racingengines.com/techpages/MoparRockerArmGeometry1.asp
and read up on mid lift geometry

I just saw a post on another forum that said to measure the ball to rocker at 9/32
I asked him to elaborate on how he was measuring
If you pull the heads measure all four corners piston clearance at their TDC and let's see if they got the block square
Hate it when this happens

 

[Heimedw]

I bet the pushrods are the wrong length! They might have forgot the proper rocker ratio? There is nothing wrong with hydrolic cams in my opinion either! They are more reliable then solid cam, and work almost as well when they are roller for a street bullit. Setting up hydrolic rockers is super easy as well!

 

[Heimedw]

Lol I didn't finish all the messages and looks like my guess was right! Lol