Slant Six Forum :: swapping from a hydraulic cam to a solid?

Also heard that swapping the rear bolt on the rocker shaft is a good idea, that way when you go to set the valve lash, you dont have excessive oil up top.

~THOR~

Quote:

Also heard that swapping the rear bolt on the rocker shaft is a good idea, that way when you go to set the valve lash, you dont have excessive oil up top.

~THOR~

Don't know for sure, but I think the bolt cannot be swapped. It has to match the threaded hole in the rocker shaft stand. The amount of oil up top is a function of the rear cam bearing journal. That is what meters the oil. The solid cam has two intersecting oil holes, that give a "pulse" of oil every cam revolution. The hydro cam has an annular groove, that gives constant oil flow.

Very possible that what you say is true. I can't seem to remember where I heard this from, but the explanation was that the shank on the bolt was a smaller size, to allow extra oil to flow up into the rocker shaft, so more would travel faster down to the lifters. The solid setup had a bolt with a slightly larger shank, so less would flow, seeing as how it doesnt need to feed a few hungry lifters....

Any experts on the topic have an idea?

~THOR~

Author:	Huffin6 [ Mon Dec 08, 2008 4:51 pm ]
Post subject:	swapping from a hydraulic cam to a solid?
what is all entailed when swapping from a hydraulic camshaft to a solid? thanx all

Author:	SlantSixDan [ Mon Dec 08, 2008 5:32 pm ]
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Please see this thread already in progress.

Author:	Joshie225 [ Mon Dec 08, 2008 5:39 pm ]
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You need to change the cam, lifters, pushrods, rocker arms and I believe the rocker shaft to swap from hydraulic to solid or from solid to hydraulic.

Author:	THOR [ Mon Dec 08, 2008 6:47 pm ]
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Also heard that swapping the rear bolt on the rocker shaft is a good idea, that way when you go to set the valve lash, you dont have excessive oil up top. ~THOR~

Author:	Charrlie_S [ Tue Dec 09, 2008 4:55 am ]
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Quote: Also heard that swapping the rear bolt on the rocker shaft is a good idea, that way when you go to set the valve lash, you dont have excessive oil up top. ~THOR~ Don't know for sure, but I think the bolt cannot be swapped. It has to match the threaded hole in the rocker shaft stand. The amount of oil up top is a function of the rear cam bearing journal. That is what meters the oil. The solid cam has two intersecting oil holes, that give a "pulse" of oil every cam revolution. The hydro cam has an annular groove, that gives constant oil flow.

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Author:	THOR [ Tue Dec 09, 2008 12:46 pm ]
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Quote: Quote: Also heard that swapping the rear bolt on the rocker shaft is a good idea, that way when you go to set the valve lash, you dont have excessive oil up top. ~THOR~ Don't know for sure, but I think the bolt cannot be swapped. It has to match the threaded hole in the rocker shaft stand. The amount of oil up top is a function of the rear cam bearing journal. That is what meters the oil. The solid cam has two intersecting oil holes, that give a "pulse" of oil every cam revolution. The hydro cam has an annular groove, that gives constant oil flow. Very possible that what you say is true. I can't seem to remember where I heard this from, but the explanation was that the shank on the bolt was a smaller size, to allow extra oil to flow up into the rocker shaft, so more would travel faster down to the lifters. The solid setup had a bolt with a slightly larger shank, so less would flow, seeing as how it doesnt need to feed a few hungry lifters.... Any experts on the topic have an idea? ~THOR~

Author:	Charrlie_S [ Tue Dec 09, 2008 9:08 pm ]
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Quote: Very possible that what you say is true. I can't seem to remember where I heard this from, but the explanation was that the shank on the bolt was a smaller size, to allow extra oil to flow up into the rocker shaft, so more would travel faster down to the lifters. The solid setup had a bolt with a slightly larger shank, so less would flow, seeing as how it doesnt need to feed a few hungry lifters.... Any experts on the topic have an idea? ~THOR~ It is correct there are at least two different bolts. I have seen that many, myself, but they were both on solid lifter heads. The shank, and the threads are different. I have never seen if the hydro heads are different, then these.

Author:	Eric W [ Wed Dec 10, 2008 12:14 am ]
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FWIW, when I put a late hydraulic head on my solid lifter engine, I use my rocker arm from the solid engine and had to use the bolt from the late head. I did notice some extra flow, but so long as you drop the RPM's down to 500 when setting the valves, its not an issue.

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