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Is there a top or bottom for factory hydraulic roller lifters? The oil drain on my lifters are on the side in-line with the pin not 90 degrees out

I lost my cam thrust plate bolts, I was wondering what size bolt and what size is the hole that is drilled into the oil bolt? I have a lathe so I can drill the bolt when I get them.

Is it possible to measure the rocker arm ratio on stamp steel rockers?

I have a chance to buy new never used w5 heads they are brand new bare heads, doesn't even have valve seats. I know a little about W5s but still had some questions. i know about the rocker gear,intake and headers. my car is a 1970 Dart that I only drag race. My goal is a low 10 sec car. 1)I'm...