This is topic rocker arm off alignment in forum Tech Talk at Northern California Ford Owners  .


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Posted by Stan G (Member # 6226) on :
 
I'm about to install edelbrock heads on my motor but
the roller tip on the rocker arm isn't centered on the valve stem.
Some are off by 50 % of the valve stem, ie the only 1/2 of the valve stem is
touching the roller tip.

pedestal, fms 1.6 roller rockers.

There is a fulcrum between the head and the rocker, if i swap those,
the misalignment goes w/ the fulcrum.
 
Posted by HaulinAss Motorsports (Member # 541) on :
 
This is very common with aftermarket aluminum heads.The term for it is called "core shift".this happens in the machining process when they are made.ive seen some afr's that had maybe 25% contact in relation to the valve,in that case we had to go to an offset rocker.

[ May 30, 2007, 12:57 AM: Message edited by: HaulinAss Motorsports ]
 
Posted by Stan G (Member # 6226) on :
 
Thanks , I as able to mix and match and improved it so now only 2 are maybe 20% offset.

How much is tolerable and what would the symptoms be ?
 
Posted by court (Member # 6700) on :
 
have you verified push rod lengths??
 
Posted by Stan G (Member # 6226) on :
 
I don't have the pushrods yet.
It's just the way the rocker sits .
 
Posted by FasterDamnit (Member # 442) on :
 
You need to talk to Edelbrock. Did you buy them new? 20% is still going go increase valve guide wear. Not a lot of options on pedestal mount heads.
 
Posted by HaulinAss Motorsports (Member # 541) on :
 
quote:
Originally posted by court:
have you verified push rod lengths??
unless the heads are milled the edelbrock heads use a factory length pushrod.
 
Posted by court (Member # 6700) on :
 
quote:
Originally posted by Stan G:
I don't have the pushrods yet.
It's just the way the rocker sits .
Im not sure how you looked at this without pushrods in it?

unless you are talking about left to right movement?
 
Posted by Stan G (Member # 6226) on :
 
Yep, not a lot of options on ped mounts .

Bought used .

Yes, the offet I'm talking about is side to side .

As Maro said, it's core shift.
 
Posted by uncle bill (Member # 3953) on :
 
hey stan, sorry to hear this. i have some rockers left over from my rx7 ill sell them to you cheep
 
Posted by court (Member # 6700) on :
 
quote:
Originally posted by Stan G:
Yep, not a lot of options on ped mounts .

Bought used .

Yes, the offet I'm talking about is side to side .

As Maro said, it's core shift.
Yeah if it is side to side then definitely casting issues.

Are those 2nd batch edelbrocks, maybe??
 




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