[DeTomaso] rocker arm alignment

Justin Greisberg justingreisberg at hotmail.com
Thu Sep 20 21:11:03 EDT 2012


i just bought the manley pushrod guideplates which fit my 3/8" pushrods on CHI heads perfectly.  i appreciate the info from everyone, but that was an easy solution for me. i still have those comp cams guideplates sitting somewhere collecting dust   justin

> From: cengles at cox.net
> To: justingreisberg at hotmail.com; will.kooiman at gmail.com; detomaso at realbig.com
> Subject: RE: [DeTomaso] rocker arm alignment
> Date: Wed, 19 Sep 2012 21:24:38 -0500
> 
> Dear Justin,
> 
> 
>              If the guide plates don't fit properly or adversely affect the
> valve train geometry, then very experienced engine builders tell me that the
> answer is to cut the offending guide plates in two and then adjust where
> they need to be for that particular engine and then *weld* them in the
> proper position.  I thought it was a bit extreme when I first heard it, but
> after four engines and the pictures from Sean, I believe it.
> 
> 
>                           Amateur engine builder,  Chuck Engles
> 
> 
> -----Original Message-----
> From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
> Behalf Of Justin Greisberg
> Sent: Wednesday, September 19, 2012 3:47 PM
> To: will.kooiman at gmail.com; detomaso at realbig.com
> Subject: Re: [DeTomaso] rocker arm alignment
> 
> 
> on my CHI heads with rocker studs and harlan sharp rocker arms, there was no
> option to move the rocker arm sideways at all.  if the guideplates dont fit,
> then there is no adjustment.  the guideplates themselves might need a slight
> right/left adjustment on the rocker studs, before you tighten the studs.
> BUT it is well known that some of the aftermarket cleveland guide plates do
> not fit properly.  summit now lists a bunch of guideplates for the
> cleveland, including some from AFR that I have never seen.  justin
> 
> > Date: Tue, 18 Sep 2012 22:46:38 -0500
> > Subject: Re: [DeTomaso] rocker arm alignment
> > From: will.kooiman at gmail.com
> > To: justingreisberg at hotmail.com; detomaso at realbig.com
> > 
> > That looks like an adjustment problem.
> > 
> > If you loosen the rocker studs, you can adjust the rockers left/right 
> > by moving the guide plate.
> > 
> > I would only cut/reweld the guide plate after I've confirmed that the 
> > ones I had could not be adjusted.  For that matter, if it's off so bad 
> > you can't adjust them, I'd get another brand of guide plates.  They 
> > are pretty inexpensive.
> > 
> > Also check that the pushrods do not rub anywhere - through their full 
> > travel.  It is pretty common for them to bind on the rocker arms or on 
> > the heads themselves (the holes cut through the heads for the pushrods).
> > 
> > Just my opinion, but I wouldn't take it back to the builder.  This is 
> > an easy fix, and you'll do it better than he will - since it's your baby.
> > 
> > 
> > 
> > On 9/18/12 6:06 PM, "Justin Greisberg" <justingreisberg at hotmail.com>
> wrote:
> > 
> > >
> > >Important:
> > >when using pushrod guides for clevelands, I found the same thing.  I 
> > >think the traditional crane or comp (I forgot which) guide plates 
> > >just do not fit properly.  I found some other brand, I am sorry I 
> > >forgot which, which was much better.  I talked to some engine 
> > >builders and they confirmed the same thing.  I think the comp cams 
> > >were not good and the manleys fit well.  I see summit now sells trick 
> > >flow brand as well, which was not available when I built my engine.  i
> was using 3/8" pushrods.
> > >I also found the pushrod length for CHI heads plus harland sharp 
> > >roller rockers was very much shorter than standard to get the rocker 
> > >over the center of the valve stem. an adjustable pushrod length checker
> was
> > >essential in adjusting the valvetrain.  justin
> 
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