Need advise on assembling Hughes shaft mount rockers

[jabird]

When centering these rockers over valve tip I was advised it is not necessary to use the .015 or .030 steel shims, if alignment was good. That would mean the aluminum body of the rocker would ride on the aluminum spacer required to get the correct offset. Will that be acceptable when you have .005-.010 total side clearance between a pair of rockers, seems like a bad idea to do aluminum to aluminum to me. Anyone who has a running setup id love advise or direction on what worked

 

[Mike Gaines]

I would absolutely call Hughes for Help.
I think you need more clearance than .005 and .010

 

[brian6pac]

I did a bb and had a very bad results we got shims from Mancini and they were .030 and we really needed .060. Mancini told my buddy to use 2 sets so he did, now we lost 35psi oil pressure! I took a while to figure out what the problem was. Here is what happened, the shaft is .875 diameter, now add a shim that raises the shaft. The contact on the valve was much better but in reality we increased the diameter of the shaft to .935, now it does not sit in the saddle, it hits the sides and the oil squirts out from under the shaft. I had to make my own shims so it would work. It worked great 70psi oil steady no bouncing of the needle and the rockers hit the valve closer to center.

 

[dieseldazzle]

I'm sure he is talking about side clearance on the rockers Brian6pac.

I just did my Harlands on the six barrel motor today and ended up with about 15 tho. Harland calls for 12. Not sure about Hughes.

 

[brian6pac]

I had a set of hughes rockers and the roller was at the outside tip of the valve, hughes told me that all I needed was .040 on the valve because the rocker pulls back under lift. That was to far out for me and I got Indy intakes .800 offset and mopar exhaust, It was a lot better and shimming it got it closer. As far as gap between the rockers I think we had about .020.

 

[jabird]

I am speaking about side to side clearance, and also just running aluminum spacer to the aluminum body of the rocker. Hughes is the one who advised .005 - .010 was ok, but that seems tight to me. I worry that the aluminum on aluminum will gal. I have no real world experience to know how much to allow for heat expansion. These are going on a street motor if that makes any difference. Brian6pac I will definitely pay attention to your point when it comes to the height of the rocker

 

[not so famous bob]

I am speaking about side to side clearance, and also just running aluminum spacer to the aluminum body of the rocker. Hughes is the one who advised .005 - .010 was ok, but that seems tight to me. I worry that the aluminum on aluminum will gal. I have no real world experience to know how much to allow for heat expansion. These are going on a street motor if that makes any difference. Brian6pac I will definitely pay attention to your point when it comes to the height of the rocker

I have hughs offset rockers, on my raised port heads. it was the first time I`d ever done a wedge rocker set up. was a bitch compared to a hemi ! I used .009 . .010, .011, and .012 feelers to help hold that clearance when tightening them down, after much screwing w/ them -on and off the heads , getting that clearance. I used the thickest spacer I could doing it, but had to do a fair amount of shimming to get what I wanted, seems fine at that clearance. get on hughs website and see what they recommend. I`ve pulled them apart a few times, and they look ok, altho I do have full time oiling to the rockers. hope this helps, takes a lot of patience. --- be sure of your pushrod clearance .

 

[brian6pac]

Yes it does take a lot of time but if you look the offset ones always push to the outside so I make sure I have a couple shims there even if they are thin.

 

[coloradodave]

I am speaking about side to side clearance, and also just running aluminum spacer to the aluminum body of the rocker. Hughes is the one who advised .005 - .010 was ok, but that seems tight to me. I worry that the aluminum on aluminum will gal. I have no real world experience to know how much to allow for heat expansion. These are going on a street motor if that makes any difference. Brian6pac I will definitely pay attention to your point when it comes to the height of the rocker

I run my Comp Magnums at .030" clearance per pair. I share your concern about aluminum on aluminum, but I would go with what Hughes recommends; after all, you had enough confidence in them to buy their rockers...

 

[jabird]

I called and spoke with Dove manufacturing today and they cleared up a ton of my questions and concerns

 

[brian6pac]

And what did they say?

 

[jabird]

There was a lot of geometry theory explained to me, but to my posted questions, steel shims are not necessary between the rockers and spacers, but they would have at least .025 of clearance not .005-.010. The spacers aren't spinning at any sport of "rpm" to cause galling. On a side note the spacers I was supplied were .015 and .030, if one needs something thicker these are small engine valve spring shims and a .060 should be readily available instead of stacking them to achieve the required clearance or centering you need

 

[not so famous bob]

There was a lot of geometry theory explained to me, but to my posted questions, steel shims are not necessary between the rockers and spacers, but they would have at least .025 of clearance not .005-.010. The spacers aren't spinning at any sport of "rpm" to cause galling. On a side note the spacers I was supplied were .015 and .030, if one needs something thicker these are small engine valve spring shims and a .060 should be readily available instead of stacking them to achieve the required clearance or centering you need

YOU CAN GET THE SPACERS AND SHIMS FROM .005 , ALL THE WAY UP TO .380 OR MORE IF U LOOK.

 

[383man]

Glad your getting it straightened out. Course I showed you my setup which as you stated I dont think they make anymore but they have worked great for me. Mine is steel hold downs and spacers and I dont run offset rockers as I run the standard rockers. Ron