https://www.nopistons.com/forums/pub...1047683561.gif I RECENTLY POPED MY MOTOR IN MY 1993 TWIN TURBO AND AM IN TH E PROCESS OFF PORTING AND REBUILDING.I HAVE SPARE ROTORS IN MY GARAGE AND DIDNT MARK THE SPARE ROTORS. I KNOW I ONLY HAD 1 EXTRA ROTOR FOR A TWIN TURBO MOTOR AND THE REST WERE FROM MY DAYS OFF OWNING A 1990 TURBO II . IS THERE ANY DIFFRENCE IF I PICK THE WRONG ONE

TO ANSWER MY OWN QUESTION AND FOR INFO FOR THE FORUM HERE IS A CHART.JUST SHARING FACTS





This chart is included in our Website and Catalog for reference purposes. The weights listed are for production, unmodified rotors.

Engine Year Compression Weight (Grams) Weight (Pounds)

12A 76-82 9.4 4603 10.15

12A 83-85 9.4 4353 9.60

13B 74-78 9.2 5253 11.58

13B 84-85 9.4 5253 11.58

13B N/T 86-88 9.4 4553 10.04

13B Turbo 86-88 8.5 4553 10.04

13B N/T 89-92 9.7 4328 9.54

13B Turbo 89-92 9.0 4328 9.54

13B T/T 93-95 9.0 4328 9.54

NOTE: Weights are approximate, and include rotor bearing, but do not include any seals or springs