Re: What's wrong with Stock stamped Big Block Rockers??
[Re: MoparDonny]
#282000
04/08/09 10:44 PM
04/08/09 10:44 PM
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Joined: Feb 2007
Posts: 1,109
Hiram, Georgia
474218
super stock
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super stock
Joined: Feb 2007
Posts: 1,109
Hiram, Georgia
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Quote:
I have never seen any of them fail but I'd like to here your experiences, pros or cons and pics if you have any. The only thing I've seen with any of mine are slightly worn pushrod tips on a couple of them from my 383 that I beat on pretty hard. Now of course, This is with street type setups with no more than 450 hoses and mild hydraulic cams. I know they have limits.
Don.
Stock 69 RR 383 with 63,000 miles?
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Re: What's wrong with Stock stamped Big Block Rockers??
[Re: MoparforLife]
#282001
04/08/09 10:46 PM
04/08/09 10:46 PM
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Joined: Nov 2004
Posts: 1,760
Port Alberni, British Columbia
MoparDonny
OP
top fuel
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OP
top fuel
Joined: Nov 2004
Posts: 1,760
Port Alberni, British Columbia
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Quote:
Not a thing until you start using a lot more than stock spring pressures. Also remember that they have a lot of miles on them. I would at least get a set of new rockers if that is what you want to use. They also are not quite a true 1.5 ratio. 
Mine are about 10 years old with maybe 2000 miles, but hard ones  . They were supposed to be HD ones from MP. They look the same as stock ones from a '75 400 that I put on my 440 thats in my car now. 
Don.
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Re: What's wrong with Stock stamped Big Block Rockers??
[Re: MoparDonny]
#282003
04/08/09 10:52 PM
04/08/09 10:52 PM
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Joined: Sep 2007
Posts: 14,889
up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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There was a running change in the rocker designed due to....pushrods punching thru the rocker. The MP "HD" rockers are nothing more than the late model upgraded ones.
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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Re: What's wrong with Stock stamped Big Block Rockers??
[Re: MoparDonny]
#282005
04/08/09 11:22 PM
04/08/09 11:22 PM
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Joined: Feb 2007
Posts: 1,109
Hiram, Georgia
474218
super stock
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super stock
Joined: Feb 2007
Posts: 1,109
Hiram, Georgia
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Quote:
Were the other ones in trouble too, or just that one?? If you remember.
Don.
Just one. The cause may have been a liquid lock, as it was found when changing a blown head gasket.
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Re: What's wrong with Stock stamped Big Block Rockers??
[Re: 1_WILD_RT]
#282007
04/09/09 12:23 AM
04/09/09 12:23 AM
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Joined: Jul 2008
Posts: 1,075
United States
STLDuster
super stock
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super stock
Joined: Jul 2008
Posts: 1,075
United States
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I thought there was an article in one of the mopar magazines a year or two ago where they "spec'ed out" all of the stock style rocker arms. Found the that .99 cent replacements from the autoparts stores where identical to the expensive heavy duty units.
I want to say they checked the material thickness, material hardness (maybe one was heat treated more or less than another), and found that even dimensionally they were all the same.
I will see if I can find that article, It will take a while to go through them though.
"No great genius has ever existed without some touch of madness." - Aristotle
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Re: What's wrong with Stock stamped Big Block Rockers??
[Re: 383man]
#282010
04/09/09 09:03 PM
04/09/09 09:03 PM
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Joined: Oct 2007
Posts: 20
Selma, Alabama
Dan Henderson
member
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member
Joined: Oct 2007
Posts: 20
Selma, Alabama
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The magazine that this article is in is Mopar Action, February 2008. The article is called, "Let's Rock". It runs from pages 64-71.
2007 Dodge Ram 1500 SWB V-6
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Re: What's wrong with Stock stamped Big Block Rockers??
[Re: Dan Henderson]
#282011
04/09/09 10:52 PM
04/09/09 10:52 PM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
master
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master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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I've always sorta thought they were fine until you get to about .500 lift. It's at about that point where the side to side push effect on the valve really starts to create some friction, and valvetrain wear. Also, they are inconsistant in their ratio's. I've heard that they can vary from 1.3 to 1.5, but generally check in well under 1.5.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: What's wrong with Stock stamped Big Block Rockers??
[Re: StealthWedge67]
#282012
04/09/09 11:15 PM
04/09/09 11:15 PM
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Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
Rick_Ehrenberg
top fuel
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top fuel
Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
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If the geometry is right (in other words, not much more than 0.500" or so lift) there's very little sliding/rubbing going on, the tips actually DO roll over the stems.
Any ones you buy today, at any parts store, are actually the "Six Pack" (read: heavy gauge '67-up) design.
If your'e talking a race engine, that's another story. But for something close to stock, they are unbelievable bang for the buck, extraordinarily well deisgned when you really analyze them.
Rick
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Re: What's wrong with Stock stamped Big Block Rockers??
[Re: STLDuster]
#282014
04/10/09 01:39 PM
04/10/09 01:39 PM
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Joined: Nov 2004
Posts: 1,760
Port Alberni, British Columbia
MoparDonny
OP
top fuel
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OP
top fuel
Joined: Nov 2004
Posts: 1,760
Port Alberni, British Columbia
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Thanks for the replies I'm going to be running an XE284H with .510 lift so the geometry should be fine. I'm gonna pay attention to the Rocker/Valve tip contact pattern when I put the heads on and get it all set up. My rockers and shafts still look to be in good shape so I'll worry about upgrading them at another date when I have some money. Work's been quite slow lately, just had to put tires on the wife's car, and we have a baby on the way for August. Not even sure if the Challenger will see the road this year now.  Happy Easter weekend!! Don.
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