Tate,
The current rocker arm setup just uses a 5/16 - 18 bolt to hold the
rocker arm in place. Aftermarket kits use a stud that is 5/16 bottom,
(the half that is threaded into the head), and 3/8 top, (the part that
the rocker fits over). The stud is made of a better quality steel (less
flex), and part of the side loads is actually distributed across the hex
that is right in the middle of the stud, ( check out an aftermarket
threaded rocker arm stud at any auto parts store). Increasing the lower
portion of the stud from 5/16 to 3/8 or 7/16 increases the diameter of
the stud and you get less flex ( think of it this way, how hard is it to
bend a coat-hanger 1/16 inch, vs. how hard it is to bend a header
bolt 7/16 inch). The loads would be the same, but better steel and
the hex help to minimize flex.
> -----Original Message-----
> From: STRICKLAND, Tate [SMTP:tstricklan@shl.com]
> Sent: Tuesday, August 04, 1998 12:06 PM
> To: 'dakota-truck@buffnet.net'
> Subject: DML: RE: RE: RE: RE: RE: Buying the Cam
>
> Wouldn't the part in the head (5/16 - 18) be put under just as much
> stress as the rest of the stud?? I don't see how just a bigger top
> end would help??? I do under stand how pulling the head and machining
>
> for a 3/8 stud would help. I really appreciate the info.
>
> Tate
>
>
> Tate,
> If you are going to use an aftermarket roller rocker setup, you will
> get studs in the installation kit. The factory hold-down bolts for the
>
> factory rockers is 5/16 -18 (pretty small). Both Crower and Crane
> use an ARP stud with their kits and are a heck of a lot more stable
> (less flex), then the factory bolts. What I wanted to do is use a
> larger
> stud (3/8 -16 bottom, machine work required). I think I can get them.
> You cannot use the factory rockers with the aftermarket studs for
> the Dodge.
>
> Frank
>
> >
> > Thanks for the info here. Question - what would a rocker stud kit
> do
> > for me? Anything? I'm looking into replacing the valvetrain
> (except
> > the valves) and have no desire to pull the heads right now.
> Thanks.
> >
> > Tate
> >
> >
> >
> >
> > Eric,
> > A few words of advice, the rocker arm
> > hold-downs
> > AIN'T THE BEST, ( hold down bolts are I THINK 5/16 and really need
> to
> > be
> > pushed to 3/8)
> > and you can't go a larger OD spring, ( spring seats are to small
> and
> > cannot be enlarged).
> > You can run stiffer spring though. And lastly, don't let anyone tell
>
> > you
> > that they are running
> > an earlier 360 grind (non Magnum), they DON'T fit.
> >
> >
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