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The optimiser I didn't know I had

Thanks for the pics. I think all the pipes are clearanced like that, although mine is dented more than yours.

On the oil pump, its hard to see, do you have the spacer plate under the cover?
 
If you got the van heads, get the van lower manifolds(there's one for each side) and make a plenum to tie each sides together. Shouldn't be to hard. I've thought about twin turboing some van heads, one intake/head for each turbo.
 
Yeah, that's the 3rd crushed valley drain I've seen. Can't be a coincidence. Not exactly sure how the crushed tolerance in measured, but it doesn't flow very well!
As far as oil pumps, the GEP engine I got had a very different oil pump design compared to the other 506 that came with the truck. IIRC, the factory one was a 3 piece design and the GEP was a 2- piece. the 3 piece model had a pickup tube plate, to a spacer to the pump body and gears. The other had only pickup tube plate right to the body and gears. I only ever took 2 6.5's apart so I have no idea what variations of pumps these things used.
 
The drain vent is smashed from the factory for flywheel clearance. As Bobby mentioned, its enough to drain what is spilled in the valley or in the HMMWV's case the rain water that gets in there. Its main purpose was to keep drainage out of the bellhousing area and put it to the outside of the block, since they added the turbo pedestal.
 
midniteplowboyy said:
The drain vent is smashed from the factory for flywheel clearance. As Bobby mentioned, its enough to drain what is spilled in the valley or in the HMMWV's case the rain water that gets in there. Its main purpose was to keep drainage out of the bellhousing area and put it to the outside of the block, since they added the turbo pedestal.
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The factory seems to enjoy smashing things to "clearance them" a bit to much.
 
HighSierra86 said:
Can anyone tell me which blocks had the valley drain?? Was it all the 506's? or just the GEP's?
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The donor for my 98 has a drain tube(undamaged),was the original engine out of a 95 chevy with manuall tranny,i thought the tube was to keep the spilled oil/fuel from getting on the clutch.
 
My 929 has a drain tube also. Might be a slightly different tube/path - don't recall the tube in mine having any deformation.
 
The new engine I received from Peninsular in December of '08 had the smashed tube as well. I just assumed that was some marine thing.

Don't you think that smashed tube would plug up pretty easily with debris and defeat the intended purpose?
 
NoDak said:
The new engine I received from Peninsular in December of '08 had the smashed tube as well. I just assumed that was some marine thing.

Don't you think that smashed tube would plug up pretty easily with debris and defeat the intended purpose?
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I doubt it. The hole in the valley leading to the tube is pretty small and will do a pretty good job of straining out debris. I think anything that would fit through the valley drain will make it out the tube.
 
Optimiser becoming a purebread

Since the heads that came with the optimiser were van/hummer heads:mad2::mad2: I needed to get some good heads for it. I bought bobbiemartin's GEP heads:D with the small precups. They will be making a stop at diesel depot to have the diamond precups and coolant liners installed.:thumbsup::thumbsup: I wouldn't mind having them ported and polished but the heads weren't even in the budget:sad: I'm thinking of new exhaust manifolds for it because most of mine are pretty rusted. Need injectors and oil cooler kit also. Plenty of cleaning and painting to do while waiting on the heads.
 
ak diesel driver said:
coolant liners??
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From what I understand they are a copper or brass liner that is put in the coolant passage between the valves. IF, the head cracks the cooling system won't become pressurized. Diesel depot and many other rebuilders do this as an insurance because the heads are so prone to cracking. It's been mentioned several times here on different threads. I have a set of heads that have had this done to them. I'll see if I can get any kind of picture that would show it. If I remember correctly the tube goes in the hole where the small soft plugs are on the intake side of the head below intake ports. Jamie from Diesel depot said that they don't let a 6.2 or 6.5 head out of their shop without them.
 
bk95td said:
From what I understand they are a copper or brass liner that is put in the coolant passage between the valves. IF, the head cracks the cooling system won't become pressurized. Diesel depot and many other rebuilders do this as an insurance because the heads are so prone to cracking. It's been mentioned several times here on different threads. I have a set of heads that have had this done to them. I'll see if I can get any kind of picture that would show it. If I remember correctly the tube goes in the hole where the small soft plugs are on the intake side of the head below intake ports. Jamie from Diesel depot said that they don't let a 6.2 or 6.5 head out of their shop without them.
Click to expand...

that sounds like a good idea. pictures please
 
bison said:
The donor for my 98 has a drain tube(undamaged),was the original engine out of a 95 chevy with manuall tranny,i thought the tube was to keep the spilled oil/fuel from getting on the clutch.
Click to expand...

It seems to me that this could be the case with the clutch. My 96' has the drain tube (also a manual tranny) and it seems to me the only other ones I have seen are on trucks with the manual trans. I kinda like the idea of them
 
Coolant liners

I couldn't get any pics because you can't see them with the soft plug in. I did e-mail jamie at diesel depot asking for a discription and possible pics. This was his reply:
"They are bronze guide liners that we install into the passage that is accessable through the soft plug under each intake port.We remove the soft plug then ream into the hole to get fresh metal. Then we brush a very high temp sealer into the passage. Finnaly we drive in the guide liner positioning the slit away from the combustion chamber. The guide liner needs to be a certain length and needs to be driven in to a certain depth so as not to block coolant flow.
There is a kit available That comes with the tooling, the driver and several sets of liners. If interested I can get a price for you. Also it is something that can be done with the heads on the vehicle.In my opinion it's a very worthwhile improvement for the engines.Let me know if you have any other questions.
Jamie Avant
diesel depot"
 
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