Magnum motor with Mechanical fuel pump ?

JDMopar said

Has anyone here actually used the Hughes extender? I had to get my hydraulic roller for my 273 ground on a Magnum blank because that was all that Bullet had at the time. I'm having a helluva time finding a woodruff key to fit the cam keyway and also work with the extender. I called Hughes today and talked to Dave, and he said they had never had the first complaint about the extender, so maybe I'm missing something. I saw a You Tube video where one failed, that I wondered if it belonged to @gdonovan ?

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I know Gary had a failure. I've been running one for several years, even swapped it to a different cam last winter. No issues for me (so far). No idea where the woodruff key came from, do they ship one in the kit and that's the one that won't work?

Only issue I have had was that the pump arm would rub on the links of the timing chain. I believe it is an issue because a roller cam can move forward in the block a little while a FT cam is constantly pushed back into the block. I tweaked the arm where it rubbed and it stopped being an issue. Wasn't much of a rub.