aaz cylinder head part number differences - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• aaz cylinder head part number differences by mk3pete on 08 May, 2015 17:36
• I need a new head and im looking at purchasing one from ebay part number 028103351J 8mm valve stems
  my old head which is cracked has a part number 028103373J
  
  Iv worked out that part number 028103351B has 7mm valve stems
  
  Is their any difference with the first two part numbers?
• #1 by mk3pete on 08 May, 2015 19:31
• http://www.alibaba.com/product-detail/VOLKSWAGEN-AAZ-CYLINDER-HEAD-CYLINDER-BLOCK_1068094065.html
  this is the head im looking at, only its through ebay.
• #2 by mk3pete on 08 May, 2015 20:03
• http://www.brick-yard.co.uk/forum/another-aaz-question_topic36016.html
  
  found this if anyones interested
• #3 by vanbcguy on 09 May, 2015 13:50
• The AAZ heads are pretty much all the same. The valve stem size is actually just the guides, you can put either 7mm or 8mm in the head to make it work with whatever valves you have.
  
  The China copy heads will probably skimp on some of the areas where more expensive metals are needed, like precups. VW uses iconel while lots of cheap ones just use steel. Guess which lasts longer... Exhaust valves too.
  
  I'd go with a used factory VW head rebuilt by a reputable shop as my first choice.
• #4 by theman53 on 09 May, 2015 16:22
• I don't know about the 1.9 heads but the 1.6 had either steel or Inconel, no rhyme or reason that I have found.
• #5 by mk3pete on 10 May, 2015 00:26
• Good to know, well the head is bare so I was always going to source my own cups.
  Was going to order from nappa as Im pretty sure there the best quality.
• #6 by mk3pete on 10 May, 2015 00:32
• The casting quality is something im a bit worried about though. Anyone had experience with the cheaper heads not holding up as well as a German cast head?
• #7 by vanbcguy on 10 May, 2015 20:55
• I don't think the casting itself has really been a problem for anyone. It's the "other" stuff like valve train parts where you really notice the difference.
• #8 by mk3pete on 11 May, 2015 03:01
• ok so the valves guides and seals i bought from hans are no good  ?
• #9 by burn_your_money on 11 May, 2015 07:41
• Quote from: mk3pete on 11 May, 2015 03:01

  ok so the valves guides and seals i bought from hans are no good  ?
  

  
  Anything from him is no good. Sorry.
• #10 by vanbcguy on 11 May, 2015 11:12
• Quality valve guides and seals are CHEAP to buy and extremely labour intensive to replace on their own.  That is not a place I'd be looking to save a couple of bucks.  Excessive guide wear or a leaking stem seal means pulling the head.
  
  GOOD valve stem seals are cheap:
  
  7mm: http://idparts.com/catalog/product_info.php?products_id=659
  
  or 8mm if needed: http://www.idparts.com/catalog/product_info.php?products_id=1992
  
  Valve guides: http://www.idparts.com/catalog/product_info.php?products_id=1264
  
  Ha... just looking, Prothe's parts are actually MORE expensive.  Wonder how he managed that...