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The pushrod side of the rockers are real close to the valve cover rail.

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Yes, and the nose of the rocker is way to high. The shaft needs to go up.

Cab, this is why I have a problem with HS. Rockers. They are way too long.

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I have used three different sets of Harland Sharp rockers in the last twenty years of racing,this was 3 or 4 on different sets of heads with no isssues to now 1st set(1.50 ratio) was used on stock 906 heads and reused again on a set of M.W. iron heads with no issues with Cal Custom cast aluminum covers The second set was a set of 1.60 ratio used on a set of Eddy RPM and reused again on a set of Indy SR M.W. port heads with no issues with any valve cover I used on that motor The last set before this current set (1.60 ratio) was used on a set of Indy 440-1 aluminum heads with thier offset rockers, no problems using the Mopar brand of Cast alumimum valve covers, three different sets in fact, natural, polished and finally wrinlkle black, the new owner of that motor couldn't decide which ones he wanted until he saw all three sets on that motor
I buy a set of Eddy Vitor M.W. heads with a set of 1.6 Hughes rockers and use the old reliable Cal Custom cast aluminum valve covers with no issues, I broke three different adjusters on them and then switch to a set of Harland Sharp rockers and have a issue with these heads only, why do I think it is the head design and not the Harland Sharp rockers that are the issue
I did order a set of Mancini Racing valve covers today, #MRE 6247 sheet aluminum fabricated valve covers that look a lot like the ones in Big Dads picture I did find out that Hughes and Mancini both sell the PRW brand of fabricated aluminum sheet valve covers that look identicle to the MRE 6247 I'll let you guys know if and how they fit on my motor with the H.S. rockers, hopefully without having to mod them in any way

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Cab, I'm not saying the heads aren't a little tighter. What I am saying, is that the Harlands are too long, and that causes problems you wouldn't otherwise have, especially when you have to raise and offset the shaft to get the geometry right. And when the roller sweeps across the valve to the exhaust side at full lift, there is a definite problem that lash caps won't fix. I honestly think the only reason you broke adjusters with the Hughes rockers is because of the beating the valvetrain was taking from the shafts being too low. And before anyone says "That's why you run Harlands", the only reason they don't break as often, is because they are really heavy. Weight is the last thing you want to add to the valvetrain. There is this thing called inertia that says "An object in motion tends to stay in motion" and I'll just add that it is in the same direction as the current motion. Considering that a rocker has to change direction every cycle, as does everything else in the valvetrain, it makes sense to keep it as light as possible without sacrificing strength. A Jesel rocker is svelte compared to a HS, and they can take a whole lot more motor than a Harland can dream about.