These are new aftermarket performance racing headers for a Datsun 510, new in the box. 

They work with the L16, L18, and L20 motor conversions.  

These headers have long primary pipes (not shorty headers.)  This header system has adjustable length header pipe for ground clearance on lowered cars. 

These are square port headers.  The square port headers will fit on both the square and round port heads and WORK PERFECTLY. 

The primary pipe diameter is 1½ inches.  The flange where the header bolts up is approximately 5/16 inch and then approximately 3/8 inch where the welded sealing bead is at each port. 

Our supply of these popular 510 headers is limited and once we're out of stock ... we're out of stock!