Rocker Arm Search
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Le Mans Master
Joined: Feb 2000
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From: Kempner Texas
Rocker Arm Search
Does any company make a 1.6 ratio, NARROW Body full roller rocker arm for a 7/16" stud?
I've found several, but none are designed for a 7/16" stud.
This may have been hashed over many times before, but if I go with the standard body rocker, what valve cover clearance issues will I face?
Jake
I've found several, but none are designed for a 7/16" stud.
This may have been hashed over many times before, but if I go with the standard body rocker, what valve cover clearance issues will I face?
Jake
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Stock valve covers I assume? The Pro Mags should be no problem. You may have to shorten your drip tabs but I'm not even sure about that. It seems that some have said that's not even needed for them with the composite covers. My stock covers, which I was still using then, had already been modified for a previous set of aluminum roller rockers when I switched to the Pro Mags so I can't say for sure. You're doing the right thing just going ahead and getting the 7/16" ones to start with, I wish I had. At the time though a cam was my biggest mod. I had no idea I'd ever get so carried away. You'd think I'd know myself better by now.... 
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St. Jude Donor '04-'05-'06-'07
Yeah I'm pretty sure that 7/16" rules out the SA part but he didn't mention that. The Pro Mag is as narrow as he's likely to find, as far as I know. I had to go and look at my factory covers. I didn't remember the reinforcing ribs and assume that this is where his concern lies. I don't know but is the fulcrum shaft wider on a 7/16" Pro Mag than on the 3/8" version? That's the only possible source of interference that I can imagine he'd encounter other than the aforementioned drip tabs.
Le Mans Master
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From: One day you're a Comet...the next day you're dust... Arkansas
I don't know about Pro Mags but I looked at Scorpion, and Crane, and neither makes what he is looking for. I thought the "narrow" was to clear the centerbolts.
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St. Jude Donor '04-'05-'06-'07
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
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St. Jude Donor '04-'05-'06-'07
No difference on the 3/8" version, also 1.625" or 1 5/8" for those who don't wish to do the math. . But now I've also seen that it's a moot point. The cover bolt passes through well below the fulcrum and so should not be an issue. I realize though that the rest of the 7/16" rocker (it's main body) is indeed considerably wider. But for those who are familiar with the design of the factory valve cover hardware for the composite covers, I'm sure you can visualize the simple solution that I have in mind, were they to be an issue at all.
. But now I've also seen that it's a moot point. The cover bolt passes through well below the fulcrum and so should not be an issue. I realize though that the rest of the 7/16" rocker (it's main body) is indeed considerably wider. But for those who are familiar with the design of the factory valve cover hardware for the composite covers, I'm sure you can visualize the simple solution that I have in mind, were they to be an issue at all.
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From: Slidell Louisiana
No difference on the 3/8" version, also 1.625" or 1 5/8" for those who don't wish to do the math. . But now I've also seen that it's a moot point. The cover bolt passes through well below the fulcrum and so should not be an issue. I realize though that the rest of the 7/16" rocker (it's main body) is indeed considerably wider. But for those who are familiar with the design of the factory valve cover hardware for the composite covers, I'm sure you can visualize the simple solution that I have in mind, were they to be an issue at all.
. But now I've also seen that it's a moot point. The cover bolt passes through well below the fulcrum and so should not be an issue. I realize though that the rest of the 7/16" rocker (it's main body) is indeed considerably wider. But for those who are familiar with the design of the factory valve cover hardware for the composite covers, I'm sure you can visualize the simple solution that I have in mind, were they to be an issue at all.Valve train
all buttoned up Notice 58mm TB with factory air intake (response to numerous threads about it won't work)
Mike
Last edited by aboatguy; May 20, 2007 at 06:27 PM.
Thread Starter
Le Mans Master
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From: Kempner Texas
Le Mans Master
Joined: Feb 2005
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From: The Motor City
The pic I posted are c.c. p magnums 1.6, 7/16" stud, full rollers, s. allign. Anything alluminum (that is shown as "narrow body") is visually wider. I don't believe you can get any narrower at the stud. If I remember, comp. cams has dimension specs. posted on their site, and did list a 1016-12 as a narrow body which no longer reads as 7/16 stud.
Last edited by mseven; May 21, 2007 at 02:40 PM.
Le Mans Master
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From: One day you're a Comet...the next day you're dust... Arkansas
Thread Starter
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Okay, thanks for all the info. I was under the impression that if the advertisement didn't specifically say "Narrow Body" I'd have a 'not easily solved' interference issue.
So, what I came away with is the CompCams Pro Magnums, which can be gotten with 7/16" studs, will probably clear the covers BUT, if not, the mod to make them clear is pretty simple. Just a little grinding.
I've already installed hardened guide plates and ARP 7/16" studs, so all I have to do now is grab a set of ProMags.
Once my pushrod length checking tool arrives I can them move on to measuring and ordering the correct length hardened rods.
I'm looking at Crane's 10308 valve spring kit; comes with double springs, retainers and locks.
Jake
So, what I came away with is the CompCams Pro Magnums, which can be gotten with 7/16" studs, will probably clear the covers BUT, if not, the mod to make them clear is pretty simple. Just a little grinding.
I've already installed hardened guide plates and ARP 7/16" studs, so all I have to do now is grab a set of ProMags.
Once my pushrod length checking tool arrives I can them move on to measuring and ordering the correct length hardened rods.
I'm looking at Crane's 10308 valve spring kit; comes with double springs, retainers and locks.
Jake
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Joined: May 2007
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From: Underground, NC
Just curious, what length of studs did you get? Generally a 1.75" or 1.825" is about right for using polylocks on these engines. This is a bit longer than stock.