GrayZee Posted December 22, 2004 Share Posted December 22, 2004 Can anybody tell me what the differences are between the heads on a 84 300zx turbo VS. a 87 Pathfinder (if there are any?) I'm sure the cams are different. Quote Link to comment Share on other sites More sharing options...
RedBeauty84ZX Posted December 22, 2004 Share Posted December 22, 2004 90% sure there is no difference. Ask on www.z31.com Quote Link to comment Share on other sites More sharing options...
Guest RoyZRide85NA Posted January 6, 2005 Share Posted January 6, 2005 Yes there are differences. If it is the W series engine, there are 6 extra water galleries. In addition, the oil pan bolt holes have been altered in the pathfinder cylinder block. The holes have been chamfered to allow usage of a liquid oil pan gasket. These chamfered bolt holes are also helpful in identifying the modified bare block. The piston and pin have been changed to a full-floating type, with two snap rings to locate the piston pin. Also, piston pin outer diameter has been decreased. The modified piston can be identified by a "W" mark on the piston skirt (As shown). NOTE: A "W" piston requires a modified connecting rod, wrist pin, and piston rings. The pathfinder connecting rod has been increased in weight, along with an increase in small end internal bore. It can be identified by a "W" stamped in the side of the rod shaft as shown in illustration. NOTE: A "W" connecting rod requires a "W" piston, new style wrist pin, and modified crankshaft. Even though the heads are modified with extra water galleries they can be used with 84 Block just not vice versa. HOPE THIS HELPS. Quote Link to comment Share on other sites More sharing options...
RedBeauty84ZX Posted January 6, 2005 Share Posted January 6, 2005 W series engine was introduced in 86 or 87 I believe. Quote Link to comment Share on other sites More sharing options...
Guest FinalRights Posted January 20, 2005 Share Posted January 20, 2005 87+ 84-86 where all the same,then 87-89 got the W series heads. Quote Link to comment Share on other sites More sharing options...
GrayZee Posted January 20, 2005 Author Share Posted January 20, 2005 April 87 was the change, luckily my 87 was built in January so there are no issues. Quote Link to comment Share on other sites More sharing options...
mtcookson Posted January 20, 2005 Share Posted January 20, 2005 not sure if the pathy engine is the same but i know on my maxima engine the heads have 4 holes for exhaust studs instead of the 2 holes on the 84-86 Z engine from what i can tell. not sure on the 87+... most likely the 87+ did get the extra two holes (even though they aren't used for some reason...) Quote Link to comment Share on other sites More sharing options...
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