1600 Queries - Steel Rocker Posts and Double Valve Springs

I used to dabble with the humble pushrodder some 20yrs ago.
 we used to stick in Datsun 1800B cranks, gemini pistons/valves, Yamaha valve springs, Duplex double row adj cam cogs and the old Kent cams Cosworth A8 cam grind ! Engine size was about 1800cc .
 The reason for that set of blocks holding the rail down is because at many revs(8000+) the std cast blocks tend to flex/break in extreme cases. Roller rockers were/are avail too but we used to replace the springs that separate the rockers with machined bronze tubes to reduce friction  .
 Bit of overkill for street use though !!

They also bring the rockers back to correct height and angle when using a high lift cam. You can also get solid spacers to replace the springs to stop the rockers walking.
The inside looks pretty clean compared to the outside, looks like it has been cared for.