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Cracked rocker identification?

Dk440

Dk440

Well-Known Member
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Hi,
Pulled the rocker cover to check lash on my 440 +30, solid lifter, purple cam
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with Eddy heads, and found a cracked rocker. I have no idea what brand they are. They are aluminium black anodized with no marks/stamps on them. Can anyone identify them, so that I can replace the cracked rocker?
I guess, with no markings on them, they are propably not a quality brand. So with that in mind - would you just change them all and be done with it? And if so, which rocker would you go for?
Recommendations would be much appreciated.
 
Think i would replace the whole works...
 
Not sure what you have but comp cams makes a real nice iron adjustable roller rocker. They are around $700 bucks a set though. You didn't say what kind of lift you have but if it's a stock or close to a stock cam, I think the stamped factory style rockers work fine
 
He has solid lifters. They do look like Indy rockers.

If one is cracked, maybe the rest aren't all that good. Valvetrain is not something to take chances with.

What cam are you running?
 
bigbluedodge said:
He has solid lifters. They do look like Indy rockers.

If one is cracked, maybe the rest aren't all that good. Valvetrain is not something to take chances with.

What cam are you running?
Click to expand...
The cam Card unfortunately did not come with the car, so I dont know exactly. It is a purple cam with pretty radical lift and rough lumpy idle!? I tried to Google the casting numbers on the cam but with no success.
 
Can ya get a hold of a dial indicator to check the lift at the valve? Also, I've never cared much for aluminum rockers just because of what's about to happen with yours. You got lucky with that....
 
I will try to get hold of a dial indicator in order to finally determining what cam I have - once and for all. The general consensus seems to be to put new rockers in - so now comes the painstaking task of deciding which ones to go for. I will try to consult one of the few renovned mopar engine builders here in Denmark and see what he would recommend based on your answers.

Thanks again - allways a pleasure:thumbsup:
 
They look like the CATs I got with an engine once. Didn't give them a chance to screw up. Went to HS.
 
OK - finally pulled the cracked rockers from my engine, only to find, that the guy who rebuilt my engine put them in up-side-down...........oil holes pointing towards the sky = oilstarvation.......................!:eek:(
Bought a set of Comp Cams 1621-16 rockers, which arrived yesterday. Which leads to my next question.........? Can I some how figure out, what new ball/ball push rods to order from the lengt of the old ball/cup one, or do I need to do a new valve train geometry check, to determine the correct push rod lengt with an adjustable push rod adjuster? And if so, do I need to order differnt length ones for both intake and exhaust ( differnt lash 0,028 /0,032 )?.
I have finally managed to measure the cam, and it is a MP 557" lift solid flat tappet.
I think I allready know the answer, but since I am a total novice, all help is much appreciated.
 
Since the rocker is adjustable, it will be more forgiving if the pushrod is close to correct length. BUT...the only correct way to do this is to measure again. With a solid lifter, you don't have the luxury of being wrong
 
go through the complete mid lift drill
add lash caps if you need to tilt the rocker up when closed (and shorter pushtods) not likely
If you have to tilt down you have to shim the shafts (and longer pushrods(
also check the angle of the adjusters
they should be in a straight line at half lift
there are a lot of screwy 440 rockers out there
combine that with a lot of screwy theories on rocker geometry
with a 560 lift cam you are about 100 more lift than stock or if stock geometry was correct you want 50 up and 50 down
problem is that with roller rockers the roller is about 200 so you are 100 up on the closed and 50 up on the open
turn the motor over and eyeball the rocker motion and if it works funny get to work
otherwise you have unneeded strain on stems, guides, rockers
 
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