Re: stock rockers on my 383
[Re: HYPER8oSoNic]
#838686
10/26/10 10:14 AM
10/26/10 10:14 AM
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Joined: Jan 2003
Posts: 8,941 Holly/MI
Dean_Kuzluzski
master
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master
Joined: Jan 2003
Posts: 8,941
Holly/MI
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If there is no obvious wear at the fulcrum of the rocker to shaft area they're good.
EVERY old Mopar big block I've torn down had some play, in the fulcrum, that was taken out when the oil pressure went up. Not an area of HIGH tolerances held when manufactured as far as I'm concerned. Or maybe it didn't matter when they knew the lifters would compensate.
If you have a replacement PERFORMANCE cam it may have a "smaller base circle" of which is known to cause more valvetrain noise. The fix is longer pushrods or adj. valvetrain.
R.I.P.- Gary "Coop" Davis 02/09/68-05/13/04
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Re: stock rockers on my 383
[Re: Dean_Kuzluzski]
#838689
10/30/10 03:09 PM
10/30/10 03:09 PM
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Joined: Feb 2003
Posts: 21,318 Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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Quote:
I've seen word on this site that those replacement rockers are no beefier than the regular production items.
From what I've read on here, it sounds more like the mopar HD rocers are the same ones that cam on late big blocks as in mid-late 70's. Sounds like the earlier ones did come with a bit flimsier rocers.
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Re: stock rockers on my 383
[Re: Dean_Kuzluzski]
#838694
10/31/10 03:35 PM
10/31/10 03:35 PM
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Joined: Nov 2009
Posts: 2,275 Desert Tracker
HYPER8oSoNic
top fuel
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top fuel
Joined: Nov 2009
Posts: 2,275
Desert Tracker
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Quote:
Quote:
But wouldn't a simpler deal in conjunction with longer pushrods be, the "six-pack" rocker arms, shafts and hardware? Especially, if you have a complete LOW or NO mileage set just laying around collecting dust! After all, they are the "service replacement" for the standard stamped-steel rocker factory rocker arms.
I've seen word on this site that those replacement rockers are no beefier than the regular production items.
But, your advice has merit pending ones budget and valvespring tension. I've gotten away with the regular production pieces with a few failures. Fortunately, the pushrod either punches through the rocker or the pushrod just fell to the side. Either way, the lifters never left their bores. And this was with the 933 valvesprings.
100% Dean, the MAIN area of "beef" or improvement is the pushrod socket, where the pushrod had a tendency to break through on the earlier design. Chrysler also improved the thickness of the rails and area of the trunnion surface. This is why these pieces are factory upgrade to the earlier versions (pre-6 pack motors). And I believe there are the matching chrome shafts to go with them. Budget allowing? It IS worth the investment, even on a "gennie" motor (moderate to high mileage). Hydraulic cams only!! But as you stated, spring tension DOES set the limit on them, before going to adjustable rockers!!
"Stupidity is Ignorance on Steroids" "Yeah, it's hopped to over 160" (quote by Kowalski in the movie Vanishing Point 1970 - Cupid Productions)
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Re: stock rockers on my 383
[Re: rbstroker]
#838695
10/31/10 03:46 PM
10/31/10 03:46 PM
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Joined: Feb 2005
Posts: 4,318 Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,318
Prospect, PA
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Quote:
Quote:
If there is no obvious wear at the fulcrum of the rocker to shaft area they're good.
EVERY old Mopar big block I've torn down had some play, in the fulcrum, that was taken out when the oil pressure went up. Not an area of HIGH tolerances held when manufactured as far as I'm concerned. Or maybe it didn't matter when they knew the lifters would compensate.
If you have a replacement PERFORMANCE cam it may have a "smaller base circle" of which is known to cause more valvetrain noise. The fix is longer pushrods or adj. valvetrain.
I have a set of stock ductile iron adjustable rocker arms for a big block. Do I need different rocker shafts or can I use the original hydraulic rocker shafts that were for the stamped steel rocker arms?
I've used ductile iron rockers on stock hydraulic shafts - they galled-up pretty bad
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Re: stock rockers on my 383
[Re: HYPER8oSoNic]
#838697
11/01/10 11:08 AM
11/01/10 11:08 AM
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Joined: Sep 2006
Posts: 1,139 West Tennessee
rbstroker
super stock
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super stock
Joined: Sep 2006
Posts: 1,139
West Tennessee
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I guess that is my question. Is there a different shaft for big blocks with factory solids and the shaft for factory hydraulics?
This is the land of the free
because of the brave
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