Not annoying at all. But the most you're talking about is .065". Stack it up on feeler gauges and see what you are lookin at.
So you think it's all about the base circle of the cam??? You have lots to learn my friend. There's more to the valve train than a spring and a base circle..Yes, I do.
Seat pressure means very little, base circle of the cam doesn't much care.
It should have a step to hold the outer spring in place. That is Dimension "A" of the reatainer.those retainers would be good but they are for dual and triple springs.
So you think it's all about the base circle of the cam??? You have lots to learn my friend. There's more to the valve train than a spring and a base circle..
Here's a problem as well, you put those springs in your customers car and it wipes a lobe a week later. He takes it to another shop and they find the increased seat and open pressure, who do you think is going to be paying the bill to repair it ( whole engine strip and clean) as well as set the springs correctly??? Yeah, it's going to be you. Try arguing your "base circle don't much care" spring theory with the customer on that one..
It's not 20, it's almost 25... so cut the downplay..
I don't have to convince you of anything.I just have to convince the OP to set them up correctly, which I think he's going to do. If you ever took time to notice, most cam manufactures don't like to see seat pressures over 130 when running in cams. With your theory the seat pressure wouldn't matter, just the over the nose pressure. I wonder why they are concerned with the seat pressure .....
My scenario above isn't about if the 25 will or won't wipe the lobe.. maybe you got a dodgy lifter in the bunch. My point is that if you don't set them up to the recommended pressure then you won't have a leg to stand on if there is a failure. The owner and the cam manufacture would totally be within there rights to blame you for the failure.
If this helps......
Just seconds ago I tried a factory retainer and lock and switched to the Comp 741-16 retainer and 627-16 (2-groove/4-groove) lock and gained .032" installed height.
Pause for thought.........is Chrysler a true 7 degree lock? Can you use Chrysler locks on Comp or Crane 7 degree retainers?
I think you are over thinkin it. I would have that beeotch runnin with the 911 sprAngs by now. But that's just me.
OP: dunno if you noticed it or not, but IQ52 posted a likely solution for your 911 springs on the first page...new locks and you can run those springs...instead of having to buy new springs...locks are cheap by comparison and you'd get to keep your new fresh better than stock springs.
Although, if you hadn't purchased the springs yet, crackedback's solution above would work well too.
here it is...
...and this
So your whole premise is based on who to blame when it fails.
Ever wonder why the same 911 spring is used on cams from .420" lift to .525" lift?
At the same 130 seat pressure?
Because we've all seen the failed cams with the flat base circle.....
So lets compare open pressures.
130lbs @ 1.900 IH -.400" lift=272 lbs open with Comps smallest cam
-.500" lift= 309 lbs open with Comps largest cam.
38 lbs of open pressure over the nose of the lobe difference from smallest to biggest.
Seems like a lot more important than 25 lbs on the base circle when the valve is closed...
But the OP will do what he feels most comfortable with, and that's ok.
Darren, let me ask you this. Are you coming back after assembly and tapping the end of the valve stems with a small hammer to insure the locks are properly seated? Failure to do that could be why you're getting a short installed height measurement.
x2
It's the diameter of the hole in the retainer, thickness of the locks, and angle of locks that will leave things in the right spot. That's why I'm concerned the locks themselves might be thicker and therefore sitting higher in the factory retainer. Dykem would show that point of contact.
Darren, let me ask you this. Are you coming back after assembly and tapping the end of the valve stems with a small hammer to insure the locks are properly seated? Failure to do that could be why you're getting a short installed height measurement.
And hay you two, can you take your pissin match somewhere else? It's gotten to the point it's not helpin a damn thing. I like and respect both of yall, but you should know better. Thanks.
Realistically, all the replaced valves should have been installed at the correct factory height at the machine shop.