Difference between 18mm and 20mm headgasket???

[brianjbeach85]

Guys.. looking into buying the "6.0 solution kit" but can someone help me decide the difference between the 18mm and the 20mm head gasket? i don't know anything about the size things... help is appreciated! can someone explain the pro/cons to each? if able..

Current mods are:
4inch downpipe-kitty killed-5 inch back
S&B CAI
getting SCT tuner with egr delete.. holding off till get the 6.0 solution
dieselsite coolant filter
amsoil oil bypass filter


Ambitions are eventually bigger injectors and powermax/aurora 4000?

[bwillis2003]

2003-2005 trucks use 18mm dowels

2006 Job1 (trucks built on or before 01/11/2006) use 18mm dowels

2006 Job2 ( trucks built after January 12th) use 20mm dowels

2007 trucks use 20mm dowels

[RescueF250]

Not sure if I would follow that honestly had one that was a Job 2 and it turned out to be 18mm. We have noticed that ones that have a solid Turbo Feed turbo tend to have 20mm dowels, The turbo feeds that have the mesh have all been 18mm.

[bwillis2003]

forgot to say..that was off of fcdp website..causeeee i have no idea lol

[craig031600]

Rescue, was that the case with my truck??

[sly1types]

When I orded my MKM Customs complete kit, they had me look at the engine build date not the truck build....my June 06 build has 20mm.

[Hivolts]

Where can I find the engine build date?

[sly1types]

Originally Posted by Hivolts

Where can I find the engine build date?

I forget exactly, but it's on the firewall somewhere on a white sticker. Maybe drivers side...

What is the build date of your truck?

[bwillis2003]

it should be between the driver door and passenger door near the bottom of the door on that pillar thing (where the 2 doors meet) it should say the month and year it was built. Mine was built 06/06 i think but its an 07, so yours could be the same case, or not.

[sinner6.0L]

the injector hold down bolts won't lie to you. if they are T40 you have 18mm dowels, T45 has 20mm