just got this in the mail

[mrvette]

I see, kind of gives the lifter a "primer" start to the lift allowing a smoother transition and an overall more stable high lift situation right? Thanks for the info!

I don't think so. The idea is to simply keep the valve fully seated until the last possible cam angle.
Maybe Belgian could post more pictures. I'm curious if the trailing profile is the same. I would think so allowing the valve to completely seat as early as possible.

The most ideal profile would be closest to a square. The only way to create that would be electrically operated valves.

Better than mechanical, but never be totally square....

wonder what ever happened with that concept of desmodromic (sp?) valves, like a rotating ball valve setup, for fuel and air??

think the had a prototype running with it long time ago but forget who was messing with it....

:ill:

 

[damoroso]

I don't think so. The idea is to simply keep the valve fully seated until the last possible cam angle.
Maybe Belgian could post more pictures. I'm curious if the trailing profile is the same. I would think so allowing the valve to completely seat as early as possible.

The most ideal profile would be closest to a square. The only way to create that would be electrically operated valves.

Hmmm...so this profile provides a "quicker" open and close of the valve? If this is the case, I'd imagine that would allow for longer durations at full open too.

 

[Belgian1979vette]

Trailing edge is the same, also inverted.

I timed my cam last weekend and seemed to find something off. Contacted Jones and he said it could have been bent during shipping. Cheched that, but apparently the cam was not bent. Discovered that the number 4 bearing was showing the copper on one side. Guess cam tunnel alignment is not good. Off to the machineshop once more .:banghead:

Well, maybe I should consider myself lucky I caught it in time.

 

[CNC BLOCKS]

Trailing edge is the same, also inverted.

I timed my cam last weekend and seemed to find something off. Contacted Jones and he said it could have been bent during shipping. Cheched that, but apparently the cam was not bent. Discovered that the number 4 bearing was showing the copper on one side. Guess cam tunnel alignment is not good. Off to the machineshop once more .:banghead:

Well, maybe I should consider myself lucky I caught it in time.

GM cam tunnels suck I do alot of repairs on those blocks to get them right.

 

[Belgian1979vette]

Trailing edge is the same, also inverted.

I timed my cam last weekend and seemed to find something off. Contacted Jones and he said it could have been bent during shipping. Cheched that, but apparently the cam was not bent. Discovered that the number 4 bearing was showing the copper on one side. Guess cam tunnel alignment is not good. Off to the machineshop once more .:banghead:

Well, maybe I should consider myself lucky I caught it in time.

GM cam tunnels suck I do alot of repairs on those blocks to get them right.

Absolutely Carl. You mentioned it before. I told them this was a possibility. But they just had the cam boring equipment in. I assume they were not sure enough to do anything about it, so apparently they just put in the cambearings as is.
I heard they were testing the new equipment on the alu BBC's they use on their tractor.

I think it was Rottler equipment they are using there.

Any chance this has affected lifter bore position as well ?

 

[CNC BLOCKS]

Trailing edge is the same, also inverted.

I timed my cam last weekend and seemed to find something off. Contacted Jones and he said it could have been bent during shipping. Cheched that, but apparently the cam was not bent. Discovered that the number 4 bearing was showing the copper on one side. Guess cam tunnel alignment is not good. Off to the machineshop once more .:banghead:

Well, maybe I should consider myself lucky I caught it in time.

GM cam tunnels suck I do alot of repairs on those blocks to get them right.

Absolutely Carl. You mentioned it before. I told them this was a possibility. But they just had the cam boring equipment in. I assume they were not sure enough to do anything about it, so apparently they just put in the cambearings as is.
I heard they were testing the new equipment on the alu BBC's they use on their tractor.

I think it was Rottler equipment they are using there.

Any chance this has affected lifter bore position as well ?

Being a GM block anything is possible!!!!