These versatile manifolds are excellent for many applications from drag to circle track racing. They provide maximum performance for engines with standard port location, iron and aluminum cylinder heads. The low-profile of the #2975 works well in applications with minimal hood clearance and where 1" or 2" spacers can be used for performance tuning. When carb spacers are not allowed, the #2999 should be used. #72975 features a pre-assembled ready to bolt-on direct port nitrous system out-of-the-box, see page 27. The Victor Jr. Port Matched manifold has CNC-blended port exits that match any competition head using Fel-Pro gasket #1206. Installation Notes: Recommended intake gasket: Edelbrock #7201 or Fel-Pro #1206.