I know the technical definition of a 3 link includes the panhard bar. I just meant they have a shock, a spring, and singular control arms versus the XR1 style 4 links found in the Crates.
No a 3 Link is just what it says it is....3 links that tie the rear end to the Chassis. Penn ohio Pro Stocks are not allowed to Run 3 Links. 4 links and Leaf Springs only. 4 link cars must be double triangulated (can't be parallel bars like a late model.) No bird Cages. Just pointing this out because it's even more impressive that a Prostock running a more restricted suspension, being 500 pounds heavier throws down lap times just as fast as a car that was designed for circle track and specifically tuned for that application. Yes the pro stocks are allowed open engines but you still have to put that power to the ground.