Type I, Type II and Group 19 camshaft

There seems to be a lot of legitimate documentation from the period and physical evidence of it. Trying to sort this out for an article based on fact, I believe nearly impossible.

Take all the know "facts" and known "documentation" and known "physically existing" is a PITA to say the least.

Writing the known and the odd existing of the period would just show AMC was doing a lot of R&R at the time and some other's In furture!

FYI, I can say the characteristics are rough, but not quite as much as you mention. I have my idle at 850, with 11" of vacuum. It pulls from about 3200 but it should be shifted at around 5500-5800. I would not run that cam and valvetrain to 7300, let alone an otherwise stock AMC short block. It is well paired with an R4B and a set of old Thorley headers. 

Thanks!

Chris 

It is a fairly radical cam for it's day, though it is old tech. I have one for years. It tends have low vacuum due to the large overlap, but the lift and duration is otherwise moderate. It has gentle ramps which gives it a lot of overlap and therefore very rough idle etc. The duration at .050" is around 224 degrees and the lift is moderate. I find it acts like a bigger cam than it is, and the overall power is good but not great. It has nice mid range scavenging properties though, especially when paired with a set of proper tuned headers. A modern cam would likely give better idle and low end properties with equal or better WOT power, though it was pretty good for it's time. 

Chris 

Chris 

Chris