Mixing n' Matching 04/05 & 06+ heads and blocks.

[boostaholic]

Based on the info below, It appears all that is needed to upgrade the cyl head to 07 oiling (Or when using a block without an oil jet) is to change the rocker arm shaft. I see no reason 04/05 and 06+ rocker arms themselves cannot be interchanged. Can anyone confirm or deny this through experience? I haven't run it like this yet, but am about to. I have an 05 motor I just put together with no oil jet, and an 07 rocker arm shaft. All other parts are from the 05 motor.


I've done some comparisons between the rocker arms, and the rocker arm shafts on 04/05 motors VS. 06+ motors. Anyone who has mixed head/block years knows that the cyl head oil flow regulator was moved from a jet in the block in 04/05 to using a smaller hole in the rocker arm shaft in 06+ motors. I took apart 2 heads, and compared the 05 rocker arms, and rocker arm shaft, with the 07 rocker arm shaft, and rockers, and didn't notice any differences other then the rocker arm oil feed hole being smaller. The 06+ rocker arms themselves have a slightly boxier exterior shape than the 04/05 rocker arms. However there are no fitment issues caused because of this, and there are no fitment issues when swapping hem between different year heads. Looking more closely at the rocker arm shafts themselves, all other holes in the rocker arm, other than the oil flow regulator are located, and sized identically to that of its 2005 counterpart. So based on this, I see no reason to change anything but the rocker arm shaft when using a block with no oil jet.

Any and all comments/suggestions/experiences are appreciated!

[boostaholic]

so everyone that is/has been running an 04/05 head on a 06+ block has is running 06+ rocker arms, and rocker arm shaft? no one is running 04-05 rockers with an 06+ rocker arm shaft?

[rick xp]

Im running a 04 block with an 07 head and havent had any troubles. The 04 oil jet is still in place as well.

is this a concern?

[boostaholic]

definitely! your head is being starved for oil I would think? Since its running trough 2 restrictors instead of just one. you'll want to remove that oil jet, or use an 04/05 rocker arm shaft asap.

[RXP6]

Im running a 04 block with an 07 head and havent had any troubles. The 04 oil jet is still in place as well.

is this a concern?

Only if you are using a 06+ rockershaft.

[rick xp]

Ok guys i put the 04 rocker shaft back in but i found out some interesting things.

The oil feed hole in the 07 shaft is 2mm and the hole in the 04 shaft is 6mm i think.

But the hole in the actual head where it goes in to the shaft is only 4mm. This is an 07 head but whats the point in running the 04 shaft if the main restrictor is 4 mm.

Should i be running without the jet and run the 07 shaft?

Whats the oil feed size on a 04 head?

[beerdart]

ttt

[9secZO6]

Despite some contradiction on compatibility on parts, I have used 04-05 blocks with late heads, rocker shaft and NO oil jet. I see no problems, but now I read the oil passage in the head may be different. Can someone confirm this with a pic? I may check it out myself as I have 3 heads, I THINK 1 is a 04..........the others are 07.

[ViperRy]

I need some info also as I have an 08 head still in a box waiting to go on my 05 block. From what others have posted you just have to remove the oil restrictor from the 04/05 block and you're GTG.

[boostaholic]

I need some info also as I have an 08 head still in a box waiting to go on my 05 block. From what others have posted you just have to remove the oil restrictor from the 04/05 block and you're GTG.

Exactly!

[RossM]

Seadoo states: If using an 06+ head on an 05 and older block you must remove the check valve in the block. You can update the oiling system to a 06+ by removing check valve in block and running an 06+ rocker shaft. The rocker shaft is now the restrictor.

[Sea Dood]

OK, I think photos will help illustrate the issue.

1. To run a 2006+ head with a 2005 and earlier block, you must remove the oil check valve/restrictor in the block, nothing else is needed.
2. To run a 2005 head with a 2006+ block, you must use a 2006 rocker shaft; nothing else is needed.

You cannot kludge together a 2006+ head on a 2005 block by using a 2005 rocker shaft, without removing the check valve in the block. The oiling passages in the 2006 head are wrong.

The first photo shows 2005 and 2006 heads together. Note that the 2005 head has three oil passages to feed the rocker shaft, whereas the 2006 has only one.

The second photo shows the oil tube that feeds the three passages. The blue arrow shows where the oil enters the head, the red arrow points to the screw that caps the end of the feed tube that is drilled 2/3 the length of the head to feed the extra passages that lead to the rocker shaft on the 2005 head. This thick tube is cast the same on the 2006+ heads, but it is not drilled the 2/3 length; it simply ends at the first oil feed hole.

[ViperRy]

Awesome..

Thanks for the pics and write up Sea Dood.

[jtrudel90]

wow ya definitally informative....thanks for taking out the time....i guess the day you stop learning is the day your in a box....wish i would have know this 2 months ago just got in from tearing down the head

[bigdeez]

Ok I was checking this out 06 head does have different passages from the 04-05. The jet in the block is the restrictor for 04-05, the rocker arm is the restrictor for the 06+. Now the difference in the rocker shaft from 06 to the past style is the single 2 mm hole which is the restrictor portion and the lack of the other 2 holes in the shaft. The 04-05 rocker shaft has 3 holes that are supplying oil. So looking at this I say if you run an older block with a 06+ head the jet has to come out with either the 06 rocker or the 04-05 rocker due to one the restrictor in the 06 or two due to the added flow needed to supply the cam cause the other 2 passages aren't there. Hope this is a correct assumption.