04-21-2015, 01:30 PM
The SNC has 4 slots and the BNC has 8 on the crank pulley, easiest way to tell. Not an issue unless its a pre-'91
http://www.miata.net/garage/crankshaft.html
http://www.miata.net/garage/crankshaft.html
Now: 07 Porsche Cayman S | 18 VW Tiguan
Then: 18 VW GTI Autobahn | 95 BMW M3 | 15 VW GTI SE | 12 Kia Optima SX | 2009 VW GTI | 00 BMW 540i Sport | 90 Mazda Miata | 94 Yamaha FZR600R | 1993 Suzuki GS500E | 2003 BMW 325i | 95 Saab 900S

