Profiler 176190493 - Cylinder Head Cast Aluminum Chevy Small Block 195cc 64cc 23Degree 2.020" x 1.600" Angle Plug, Assembly w/ 1.437" springs for solid flat tappet or Hyd.roller liftersProfiler 176190493 Cylinder Head Cast Aluminum Chevy Small Block 195cc 64cc 23Degree 2. 020" x 1. 600" Angle Plug, Assembly w 1. 437" springs for solid flat tappet or Hyd. roller lifters Whether it's circle track, drag racing or street performance the Pro Filer All American Series SBC cylinder heads are the solution for your big horsepower needs. Featuring powerful port designs that are packed with air speed and unbeatable, made in the U. S. A.,