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Smallblock454 · 05-25-2016, 12:27 AM

Hello,

cylinder heads. From the part number the heads seems to be different – so there might be differences, so you should check that in very detail (even if the 986 parts number says 996 in the beginning):
986S - bank 1: 996 104 001 09
986S - bank 2: 996 104 002 09
996 - bank 1: 996 104 003 05
996 - bank 1: 996 104 004 05

Also the prior part numbers don't match.

It's pretty unusual that cylinder head gaskets break in this engines. Mostly it's a cracked cylinder – open deck design. If you have access to an endoscope camera you can check it with pulled sparks.

The 996 doesn't have a combined water / oil cooler. The oil cooler system is completely separated.

Regards, Markus

05-25-2016, 12:27 AM	#6
Smallblock454 Registered User Join Date: Jun 2014 Location: LB, Germany Posts: 1,456	Hello, cylinder heads. From the part number the heads seems to be different – so there might be differences, so you should check that in very detail (even if the 986 parts number says 996 in the beginning): 986S - bank 1: 996 104 001 09 986S - bank 2: 996 104 002 09 996 - bank 1: 996 104 003 05 996 - bank 1: 996 104 004 05 Also the prior part numbers don't match. It's pretty unusual that cylinder head gaskets break in this engines. Mostly it's a cracked cylinder – open deck design. If you have access to an endoscope camera you can check it with pulled sparks. The 996 doesn't have a combined water / oil cooler. The oil cooler system is completely separated. Regards, Markus Last edited by Smallblock454; 05-25-2016 at 12:34 AM.