I'm sittin here looking at the difference in long rod verses short rod pistons. The pin height is 3/16 of and inch higher on the long rod piston. So this piston will drop the top by 3/16. Instead you may want to use the 3/16 spacer plate cause the piston is an 87-89 design. The 86 piston matches the FTZ cylinder better on the intake side. I will send spacers and this piston. Just set what you don't use aside and I will get them from you later.