hey whats up u guys, i was wondering, u guys know that our 420a cylinder compresion is supposed to be 170-225 when N/A, but to how much does it lower when u get the 8.8:1 wiesco, or JE pistons? just curious.
8.8's should be ~155-175 psi depending on what you gapped your rings at.
Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician