Forgive the intrusion, its not a Ferrari but it is a Dino motor. I recently purchased a FIAT Dino Spider and as I go through the motor getting it ready, I found that my cam chain is loose on the passenger side of the motor. I have found that my motor is butchered with a mixture of later and early heads. On the one early style head, there is a lock nut on the front of the head that you loosen and then can tighten or loosen the chain tension. I have one of these heads on my motor. The other head uses what I believe is the 246 style of chain tensioning, that is some type of spring adjustment. How does one adjust the chain tension on a 246 ? By the way on a 206 Dino the chain tension is 7mm deflection with 20kg pull, is that the same on the 246 ? or do the springs take care of it ? I have the manual for the 2Litre but not the 2.4Litre. The motor did run when I purchased the car a month ago, it ran very poorly with welded centrifugal advance weights in the distributor (timing was forced somewhere around 30BTDC so it would not idle but ran nicely at high RPMs) and approx. 15 year old gas in the carbs but it ran so I dont think the mixture of heads will be be a factor once I adjust the tension and put it back together. I am fantasizing getting the car on the road this weekend as I have all the other parts finally.