These are bad also.. Z1 Motorsports 300zx Urethane Motor Mounts.. [ http://www.z1motorsports.com/product_info.php?products_id=5583 ] I did a Lower Engine Bearing Set on the '92 NA a few weeks ago.. the Cross Member came out with 1/2 of the Engine Mounts still attached.. so it was time to replace.. My Son wanted Aluminum and Shinney.. so we got these.. As I was tightening up the Upper Nut.. I pulled the Stud out of the Aluminum .. made me a little Grumpy.. The Upper Stud ( 10MM ) has only 10MM of thread depth in an ALUMINUM piece.. That is not going to hold much! I was able to Re-Machine and place a Countersunk Bolt (3/8) INSIDE the Mount upper Half.. and put it all back together.. I did the same to both Mounts.. Other than that.. I like them.. Cj
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