Ok just giving you an update for your info. I have not blow a oil seal in about 1000 miles or so now. I'm not 100% blaming you on the head gasket. It could be something you did on your part or a bad cometic gasket that are showing up a lot more often now in z32's . The oil pump I sent you was 100% new and oem .you ported and did your rebuild service and reinstalled on my engine which be came a massive oil leak. So you may want to also except blame there also for the leak as I took it off and fixed it now after rebuild and it don't leak a drop. And for some reason this engine has lots of blow by and the rear pvc pipe would come out on dyno and smoke the shop up bad. Yes and your right had that issue before and after I rebuilt it. Iv ran it with open.filters on pvc and still have the issue. I did not change any of your clearances. So why is it you think your engine is having lots of blow by and popping off pvc elbows from valve covers. Their not loose and i have had two brand new sets off oem pvc valves in your engine. As i told you these issues if you would have stepped up and fixed them after i bought about 5-6 seals and 3 timing belts it would have made our business relationship much better.