Subaru EJ251 Swap Kit for Mazda Miata/MX-5
by Christopher Christopher
Published in engineswapdepot.com
Miata One is a company in Eagle, Idaho that makes a swap kit to install a Subaru naturally aspirated EJ251 (SOHC) flat-four into a Mazda Miata/MX-5. The swap kit is made for 1989-1997 NA and 1999-2005 NB models using a Subaru EJ251 phase 2 block with an EJ251 phase 1 dual port heads and Subaru five-speed manual. The phase 1 heads are used to give the most amount of clearance between the frame rails. The swap is not a bolt-in process and requires the subframe and crossmember to be notched. The kit costs $925 and includes motor mount adapters, bracket to connect Subaru transmission to PPF (frame), shifter mount and isolator bushing, alternator mount and adjusting bracket, fasteners, and installation manual.
Source: Miata One via Piotr