Regal V6-231 3.8L VIN L SFI (1990)
Piston: Specifications
Ring Groove Depth
Top Compression .............................................................................................................................................................. 4.3894.519 mm (0.173-0.178 in.)
2nd Compression ............................................................................................................................................................. 4.389-4.519 mm (0.173-0.178 in.)
Oil Control ....................................................................................................................................................................... 4.204-4.334 mm (0.165-0.171 in.)
End Gap
Top Compression ............................................................................................................................................................... 0.2540.635 mm (0.0100.025 in.)
2nd Compression ............................................................................................................................................................. 0.254-0.635 mm (0.010-0.025 in.)
Oil Control ....................................................................................................................................................................... 0.381-1.397 mm (0.015-0.055 in.)
Side Clearance
Top Compression ......................................................................................................................................................... 0.033-0.079 mm (0.0013-0.0031 in.)
2nd Compression ......................................................................................................................................................... 0.033-0.079 mm (0.0013-0.0031 in.)
Oil Control ..................................................................................................................................................................... 0.028-0.206 mm (0.011-0.0081 in.)
Ring Width
Top Compression ........................................................................................................................................................ 1.476-1.497 mm (0.0581A).0589 in.)
2nd Compression ........................................................................................................................................................... 1.47-1.497 mm (0.0581-0.0589 in.)
Oil Control ................................................................................................................................................................... 2.850-3.002 mm (0.1122-0.1182 in.)