Read this:
02 to 05 4200 have a plastic cam cover.
06 to 09 have an aluminum cam cover.
The blocks use a dry cast iron sleeve in them - they are replaceable. 2004 up have better sleeves.
2006 up rods are stronger and have oil squirters in them to cool the pistons.
Cranks
All cranks are cast. They will support 1100 hp.
2002-2005 cranks are fully counter weighted. 7 timing notches
2005 SERVICE cranks are cross drilled - rare part. Also the best crank. 7 timing notches
2006 - 2007 reduced counterweights, cross drilled 7 timing notches
2008 - end of production, reduced counterweights cross drilled 58 timing notches
Personal experience - the 06 up cranks are hard on rod bearings due to dynamic loading especially if your running performance parts.
Heads
The 2002 - 2005 heads are inferior in terms of flow.
The 06 up heads are better.
The key to making a 4200 go is head porting especially on the exhaust side. Starting with a 06 head is better.
Quick engine ident.
2002 to 2005 engine use plastic cam cover.
2006 up use an aluminum cam cover.
If you change from early to late head the following parts need to change:
head
cam cover
ignition coils
exhaust manifold
VVT actuator
The cam timing is slightly different between the early and late engines.
In stock form the engine will support upto 15 psi boost with a good tune.
Last edited by efi-diy; 03/07/19 02:26 AM.
