I just did a tune-up of my 292, and I noticed that while most rockers had a locking nut and an adjuster screw, the exhaust valve on the #5 cylinder (the front most valve on the driver side bank) was different, it was one size smaller wrench, and it had no screw, it was just a lot tighter to turn all the time. I noticed something similar with my 170 I6 in my old fairlane, but it seemed random there, with three different variations put througout (and I know that was never messed with by the owners). I was told my 292 had oversized valves installed. Could they have put one used rocker on, or something? Or, as my other ford would suggest, are they just sometimes different from the factory?

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People should not be afraid of their government, a government should be afraid of the people.

--Alan Moore

all later y blocks used the jam type you described.you often see them mixed up,they didnt come this way.

I believe the replacement adjuster screws did not require the locknut.In other words if you purchased a replacement screw it was the later style which didnt use the locknut.Much easier to adjust valves with motor running without having to fight with the locknut. 

  

And I tought I was the only crazy guy who adjusts valves with the engine running...

Túlio Lazzaroni "FORD", Florianópolis SC Brasil.

'74 Ford Galaxie 500 292 V8

'82 Ford Galaxie Landau 302 V8

'98 Chevrolet S10 4.3 V6

'01 Ford Focus 1.8 Zetec