[A26B]

Originally Posted by Dynomite

Jerry's pan gasket is a bit thicker than stock and he supplies a new "O" ring which is the same diameter but thicker for the oil pick up (91' Z) to accomodate the thicker pan gasket. Just make sure you keep that "O" ring in place as you position the oil pan with new gasket if it is the same as a 91' Z

Actually, my pan gasket is not thicker than the OEM, stock gasket. The o-ring by design does have a larger cross section, i.e. thicker. The gasket probably feels thicker because it is uncompressed, has much higher tensil strength and is wider to take advantage of more mating surface area that is present on the block & pan. All of these modifications make the gasket stronger and improves the seal. "Compressed" gasket thickness (when installed) is virtually identical to the OEM gasket.

The OEM o-ring when used with the OEM pan gasket or mine, is only compressed 3~4%, whereas design standards for o-rings of this size & used in flange seal applications is significantly higher at 20~30%.

Here's a drawing to show the application details. Post any questions you have & I'll do my best to answer. BTW, the drawing shows the o-ring groove to be in the pan, whereas it is actually in the oil pickup tube, which is at the same level as the oil pan.