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yes the compression is lower. you are right and i am not sure but i belive it is all becuse the piston is dish.
i am not sure how this will effect the motor. seeing how i will be useing this as a non turbo applaction, i see no sence in swapping pistions and ring when this looks to be almost new,


You can run the low compression pistons and have a turbo ready motor. Each point of compression ration that you drop drops your power and fuel economy about 3%.

A new set of cast pistons with rings should cost around $120, plus the cost to press them off.

You should also get the rods checked to make sure they are not out of round.

87 Turbo Intercooled Raider, roller cam, torsen rear diff, LSD front diff, lockup auto with modified converter, V6 brakes, low transfer case gears...