My 1977 911s had a recent engine rebuilt with new New Chain Tensioners plus new SSI's & muffler. Does this add Horsepower & Torque? Or just make the car a bit quicker by removing the smog system the car had originally. The car was owned by a engineer who close to 40 years. He kept a complete library on servicing the car all these years. Here is a link on one of the binders he kept on the engine rebuild.
Thanks
Sam
https://www.flickr.com/photos/124038604@N05/albums/72157714343470826/with/49906442016/
https://www.flickr.com/photos/124038604@N05/albums/72157715333541146