Crane Rocker Arm Issue

[1 Wild R/T]

I saved this photo years ago, wonder why people always have fitment issues with their rockers...

[cudabob496]

are you saying that because the roller tips do not line up in the photo?

[1 Wild R/T]

are you saying that because the roller tips do not line up in the photo?

Well there's that, the huge variance in clearance for valve springs, variance in width... If I had a side profile I'd love to see how much that varies...

And before you tell me they are different ratio is the reason the tips don't line up realize the dimension from the rocker shaft to the valve is fixed... Raising the shaft alters the distance but to keep geometry correct that means you need longer valves and pushrods...  Ratio is normally altered by bringing the pushrod closer to the rocker shaft....

[cudabob496]

are they all for the same year 440?

[brads70]

Personally I would look at a stainless rocker like PRW or Comp , or a nodular iron rocker Like the Crane , Alum is OK for racing , not so good for long term street use .

You got me thinking?  What about my T&D aluminum rockers? I bought them thinking they would last a long long time?

[Chryco Psycho]

Hard to say , I have heard T&D are some of the best rockers available , there are different grades of Alum as you know & better processes for keeping the rollers retained in the tips etc .

[1 Wild R/T]

are they all for the same year 440?

?  That doesn't even justify a reply...

[cudabob496]

?  That doesn't even justify a reply...

Well, it does not look like it, since I am using the crane gold rockers on my Stage VI heads, and all those
rockers look different.

[inviolet]

I saved this photo years ago, wonder why people always have fitment issues with their rockers...

Wow...Big discrepancies, who's to say who's correct?  Maybe the variances are due to different thickness in Shafts? Maybe the larger rockers came with a skinner diameter shaft?

FYI, those Harland Sharps above look like the ones I had with the needle bearings, maybe that's why there so thick.

Also spoke to Crane a few days ago, They said their MOPAR shaft mounted rockers are temporarily discontinued because they moved there manufacturing facility. He doesn't when they'll start reproducing them again.

Here's a picture of one of the Pins that walked. I pushed it back through with a vice, temporary fix.

[cudabob496]

just for general info, if no one has seen this before:

http://www.forabodiesonly.com/mopar/showthread.php?t=39225

[cudabob496]

Well there's that, the huge variance in clearance for valve springs, variance in width... If I had a side profile I'd love to see how much that varies...

And before you tell me they are different ratio is the reason the tips don't line up realize the dimension from the rocker shaft to the valve is fixed... Raising the shaft alters the distance but to keep geometry correct that means you need longer valves and pushrods...  Ratio is normally altered by bringing the pushrod closer to the rocker shaft....

I think the variance in width is addressed with different spacers that are provided.
And no, the question of different ratio hadn't crossed my mind.

[Kevin71]

I just read a article about them in a build book on the 440.  Arthor said ones with needle bearings need to be thicker around the shaft as there is less metal as the shaft hole will have to be enlarged enough to hold the bearings.  Or some co. use a smaller shaft to keep the rocker size large enough to keep from breaking.  He said to go with a bushed one as it is oiled and would be strong enough.  But that being said that is only up to certain spring load and lift.  I think is 200 lbs  Going to higher lifts and more spring pressure you need to go up to Jessels or something like them.  Running bushed ones they would ride on the oil just a bearing up to a point I would think.  I mean you got a thin layer of oil over the rod bearings that protect the bearings don't you. 

[Chryco Psycho]

with needle brgs only 2-3 brgs are taking 100% of the load, this can wear groves in the shafts where the needle brgs contact  , also the surface area to distribute the load is reduced to nothing , + you cannot Trap oil in a needle brg cage , bushings to me seem to be far better design

[1 Wild R/T]

I just read a article about them in a build book on the 440.  Arthor said ones with needle bearings need to be thicker around the shaft as there is less metal as the shaft hole will have to be enlarged enough to hold the bearings.  Or some co. use a smaller shaft to keep the rocker size large enough to keep from breaking.  He said to go with a bushed one as it is oiled and would be strong enough.  But that being said that is only up to certain spring load and lift.  I think is 200 lbs  Going to higher lifts and more spring pressure you need to go up to Jessels or something like them.  Running bushed ones they would ride on the oil just a bearing up to a point I would think.  I mean you got a thin layer of oil over the rod bearings that protect the bearings don't you.

I know a very successful engine builder who runs bushed Isky rockers with 800 lbs over the nose... No issues...  200 lbs whats that? A stock spring?

[inviolet]

FYI,,

I just got my set of Harland Sharp rockers from Mancini Racing (Mancini Rockers). There OK....but lets just say quality control at Harland Sharp doesn't appear to be job one. On the roller/bearing side, no two oiling holes are drilled in the same spot. They must have been drilled on a Friday, not to mention this is the second set with a notch/nik in the ball bearing/roller.  The first set was from Summit and they where the high end Harland Sharps with the need bearings. They went back...now I'm debating what to do with these. They will probably work just fine but for money you pay...I not impressed.