kellyf Posted October 21, 2015 Share Posted October 21, 2015 I feel like a complete dumbass,but is there an easy way to figure out which gasket set to order? I read the communization thing, but that confused me even more.The block has 20 mm dowel holes.The gasket set I have has 18 mm gaskets with dowels that go from 18 to 20 .Can someone help thanks Quote Link to comment Share on other sites More sharing options...
kellyf Posted October 21, 2015 Author Share Posted October 21, 2015 And 20 millimeter heads Quote Link to comment Share on other sites More sharing options...
kellyf Posted October 21, 2015 Author Share Posted October 21, 2015 not replacing heads Quote Link to comment Share on other sites More sharing options...
Popular Post Matt Saunoras Posted October 22, 2015 Popular Post Share Posted October 22, 2015 The stepped dowels are only used if you have mixmatched dowels in the block and heads. Say you have an 18mm block and 20mm heads you would use 20mm headgaskets and the stepped dowels. The headgasket dowel size always matches the head dowel size. The way to tell commonized 20mm heads is by looking at the injector hold down bolt size and the rocker carrier bolt size. If you have T45 Injector hold downs and 10mm (13mm head)rocker box bolts then those are commonized heads. T40 injector hold downs and 8mm (10mm head) rocker box bolts are non-commonized. A quick ID (but not a failsafe) is looking at the oil dipstick handle. T-handle = 18mm. Ring handle = 20mm. There is about a weeks time where 18mm dowels came with a ring dipstick. I have seen one of these trucks. Now for the confusing part. Any new ford 18mm heads with a part number ending in "DA" or "ARM" will come with 20mm dowel size and from the outside appear to be 18mm heads. The only way you would know these were 20mm would be either the service history or physically removing the head. I have to keep both sets of gaskets here at the shop. I still do a few of these things and you just never know what you're going to find. 3 Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted October 22, 2015 Share Posted October 22, 2015 Like! Quote Link to comment Share on other sites More sharing options...
Brad Clayton Posted October 22, 2015 Share Posted October 22, 2015 :rockon: :rockon: Yeah that gets a five head banger salute! Quote Link to comment Share on other sites More sharing options...
kellyf Posted October 22, 2015 Author Share Posted October 22, 2015 Awesome. Never heard about the dipstick thing. Pretty neat. Quote Link to comment Share on other sites More sharing options...
mchan68 Posted October 22, 2015 Share Posted October 22, 2015 May I also add the following. Yellow ring dipstick, "spaceship" style FICM hold-down nuts and "stepped" exhaust manifold to y-pipe bolts are the quick and easy external visual identifiers of the communized engines (20mm head and block) that are January 2006 and later build engines. Therefore, the black t-handle style dipsticks (the ones that like to break), with eight 10mm head rocker arm carrier bolts (that was replaced by only two 13mm head bolts), as well as upper brackets that secure the FICM and the non-"stepped" exhaust manifold to y-pipe bolts are on the non-communized engines. 1 Quote Link to comment Share on other sites More sharing options...
lmorris Posted December 1, 2015 Share Posted December 1, 2015 Quick question, putting a set of 3C3Z ARM heads on a 2004 block. Block has 18mm dowels, heads and gaskets are 20 MM. I flipped the heads and inserted the dowels and set the gasket on and it seems the gasket is flush with the step on the dowel. I am concerned the dowel will limit gasket crush. Should I be concerned? Quote Link to comment Share on other sites More sharing options...
Matt Saunoras Posted December 2, 2015 Share Posted December 2, 2015 The headgaskets are 20mm right? Put the stepped dowels in the block until they rest on the shoulder then set the headgasket down. Edit - wait I re-read your post. The stepped dowels have always felt tight to me when seating in the block, I'd guess it seats in the head tight too. Is there a shoulder in the bolt hole of the head that the dowel hits against? If not I'd just assume once the head is tightened down the dowels will seat fully. Quote Link to comment Share on other sites More sharing options...
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