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Old 12-20-2012, 02:00 PM   #1 (permalink)
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Default Rocker arms..

so the only thing left in my engine bay to replace on my stock rebuild 289 is rockers and pushrods. I was told i could upgrade from non roller lifters to roller tip rockers without having to change the studs... Is this true? I wanna make sure before i buy them..
68 coupe, 289 .030 over, mild cam

http://www.summitracing.com/parts/sum-141708
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Old 12-20-2012, 02:13 PM   #2 (permalink)
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Yes, the roller tips area direct replacement. Of course, if you have upgraded the cam, screw-in studs are a really good idea. It's not like they are expensive, about $25 for a full set.
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Old 12-20-2012, 04:14 PM   #3 (permalink)
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Consider screw in studs required if you changed out the valve springs. Still a good idea if you are doing head work anyways since it is cheap insurance. Also, I would go with the full roller rockers as I've had a valve tip get eaten up by rockers with the pivot balls.

http://www.summitracing.com/parts/cmb-09-0017/overview/
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Old 12-20-2012, 08:24 PM   #4 (permalink)
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now i honestly have no idea if the machine shop did install... screw in studs. I should check... Would those rockers work w.o screw in studs and the guides i was reading about?
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Old 12-20-2012, 11:17 PM   #5 (permalink)
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If your original rockers are stamped "rail" rockers and you are replacing them with anything but, you'll need guideplates and hardened pushrods to correctly locate the rocker arms.
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Old 12-21-2012, 12:08 AM   #6 (permalink)
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Quote:
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If your original rockers are stamped "rail" rockers and you are replacing them with anything but, you'll need guideplates and hardened pushrods to correctly locate the rocker arms.
I might be misunderstanding what you are saying but the roller tipped rockers are available from comp cams with the "rail" style ends to keep them on the valves(no guideplates required) ..
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Old 12-21-2012, 12:20 AM   #7 (permalink)
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No kidding? Bonus then, I guess.... except for the fact that even rail rockers have a tendency to "jump the track" so to speak at high rpms.
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Old 12-21-2012, 02:55 AM   #8 (permalink)
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can you tell what it is by looking at it? lol
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Old 12-21-2012, 11:19 AM   #9 (permalink)
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Nope.

Need closeup picture of the top of the valve spring, rocker tip.
Also the area where the pushrod comes up out of the head.
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Old 12-21-2012, 11:36 AM   #10 (permalink)
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can you tell what it is by looking at it? lol
From the look of the rocker, and the big pushrod hole in the head, those are rail type rockers, which were used on every 289 from '66 onward and 302's from '68 into the '70's when they switched to the "sled" type with a separate pedestal and cylindrical fulcrum, which do not need guideplates or rail type rockers.
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Old 12-21-2012, 01:50 PM   #11 (permalink)
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So the rockers i posted wont work? So apparently i have no idea what im looking for then
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Old 12-21-2012, 01:56 PM   #12 (permalink)
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Quote:
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So the rockers i posted wont work? So apparently i have no idea what im looking for then
http://www.summitracing.com/parts/cc...view/make/ford
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Old 12-21-2012, 03:54 PM   #13 (permalink)
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Aight... Im ordering thoose^^^

Before i do it are there any special push rods ud get
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Old 12-21-2012, 04:08 PM   #14 (permalink)
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Quote:
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Aight... Im ordering thoose^^^

Before i do it are there any special push rods ud get
Nope. They are "self-aligning" and don't use guideplates.
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Old 12-22-2012, 10:06 AM   #15 (permalink)
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I expanded the photo on my iPad and that looks like the early non rail rocker, and the hole appear to be the slotted type that holds the pushrod in place.
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