Harland sharp roller rockers - measure pushrod length

threewood said

Mike, what is the holdup of all these rocker manufacturers from making specific sets for certain heads or engines? Is it more than just adjusting where the pivot hole is drilled? They have had forever to figure it out!

I have one of your kits on my 440 and the sweep is centered and small. Love it and worth the money to me. Using Hughes rocker arms.

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The rockers are designed based on where the stand is located in the head. Of the stand location is wrong (and it is), then the rocker will be wrong. They design them for the best compromise when the end user takes them out of the box and bolts them on.

My kits only correct the stand location in the heads for a given combination of parts, but the rocker design is set in stone and can't easily be changed. A custom rocker is the only solution. On the flip side, if they designed a rocker for the correct stand location, but the stand was in the wrong place, the geometry would be worse overall than the compromised rocker. A better Mopar head would have the stands milled flat with blocks for mounting the rocker shafts. Then the blocks could be adjusted to the correct height for each combination.