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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 03-30-2008, 08:33 PM   #11
tyler72
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Default RE: Roller Rockers

Actually, yes the stock size heds do have 5/16 threads, but the earlier heads had 5/16 studs with nots instead of bolts. Im not sure about the 78 heads, they may be bolt or stud. Anyway, for the GT-40 heads, I KNOW they are 5/16 bolts, but if you want put in screw in studs for use with Roller Rockers, check online. Its either ARP, or Comp cams that makes screw in studs with a 5/16 thread on the bottom side (side that screws into the head) and a 3/8 on the top side (where the rocker goes). This prevents you from having to get machine work done to install the better rockers.
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Old 03-30-2008, 09:09 PM   #12
projectresto83
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Default RE: Roller Rockers

Cool. I will have to look into those.
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Old 03-30-2008, 09:10 PM   #13
tyler72
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Default RE: Roller Rockers

Yeah, they cost the same as any other screw in stud, but save time and money by eliminating the usually required machine work.
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Old 03-30-2008, 09:29 PM   #14
projectresto83
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Default RE: Roller Rockers

Yup I found them. I guess then with those I don't have to use the guide plates that are stock correct. Since there is no plave for them to sit anyway.
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Old 03-30-2008, 09:34 PM   #15
tyler72
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Default RE: Roller Rockers

Well, with roller rokers you will need to run some type of guideplate, otherwise, there will be nothing to keep the rockers in line with the valve. With the guidplates you will also need to be sure to use hardened pushrods. Do the heads have guideplates on them now???
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Old 03-30-2008, 09:42 PM   #16
projectresto83
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Default RE: Roller Rockers

Yea, they have the stock style channel iron shaped plates. (The ones that look like u's squared off) Where would that plate go then?
From this pic it doesn't look like that would work
http://store.summitracing.com/largei...ca-4504-16.jpg
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Old 03-30-2008, 09:42 PM
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