Put a solid cam in it with some real springs and be done with it.

IMO, the MP 933 spring is technically a better match for the 509 cam than the Comp 911.

My main gripe with the 911 is its way too far away from coil bind with most typical hyd cams.
Installed at 1.900, it's .200 away from bind at .500 lift, which is a little more of an invitation for spring surge than a spring with similar pressures, that's a bit closer to coil bind.

The MP 933 spring is fairly high rate, and is getting close to being maxed out at .500 lift.

There aren't many cams that I feel the 933 spring is a good match for, but the MP 509 and 484 cams are two that I feel are.

It i "had to" run a hyd cam, I'd use the Hy-lift B-2330S lifters adjusted at zero preload and a spring package set up for like 140/340.

A good read on the pitfalls of hyd cams and high rpm is the old Mopar Muscle article by Dulcich in 2005(iirc), "mild mannered mauler".

Have you tried a different set/brand of lifters? Had that issue years back and the lifters would pump up at RPM and it would just nose over on the top end.
.

The 1st build up in 11' had the Summit 6401 cam and Comp lifters.
Stock rockers etc.
2nd cam MP 509 MP lifters stock valve train.
3rd cam Comp 525 with Comp lifters and adjustable Crane rockers on Stage 6 heads,can't use stock rockers on Stage 6 heads.Pushrod end hangs over valve cover face.
4th combination MP 509 back in with Crower cam saver lifters.
Crane rockers.
I followed the instructions with the lifters,I will have to find the instructions and confirm my memory.
The RPM ceiling has been there through all the changes.

Same springs for all combos?

When you get tired of messing with it, you'll put a solid in it.

440, mild solid cam, Mancini rockers, single springs(140 on the seat);

Don't forget that the rocker ratio will end up making he valves open more than just the thread increase or decrease with the adjuster changes, which can affect the pressures on the lifters
I like to use right at 1/4 to 1/3 turn preload on 3/8 adjusters from zero lash at room temps. to start with and go from there with the motor broken in and warmed up

Yes,I had a .528 MP solid in mind,then I saw the new 114-c/l 509 and tried it.

I`m sure to some reading some of my posts on this thing, that guy is F++k== nuts OR stupid.
You would`nt be 1st to say so.

In my own defense I have NO ONE to talk over or bench race ideas with except forums like this. So yes I make mistakes and take the long way around sometimes.
It is what it is..............

I had it written on the board 1/2 from O-lash cold.

Something experiment with next summer.

Well couldn`t wait for spring,so installed a used set of Hughes 1106 dual springs I had on the shelf.

I left the open Weiand Team G on it,only installed the springs.

The damper in the single springs had destroyed the seat shims,not impressed by the debri in the pockets.

So anyway just springs NO other changes.

I was hoping it would pull higher but did not expect to see such a dramatic change.
Idles better,crisper
Throttle response is impressive.
Power everywhere from idle to 6,000 is smooth and am suprised just how good it runs for the wrong intake,jetted way rich=11.5 AFR,not enough timing for 8.8cr. and 3.33 gears.
My butt gauge says 11.80ish.

So the springs were it.
1,000 to 6,000 with no popping or nosing over.

If we get another stretch of good weather,I will install the blower and have at it.
Thanks for all the ideas and replies

I think the .528 would have been the better choice, but glad you found something that made a difference.

Next time its apart I`ll have to do some digging and see if a change is worth the money.

I have to remind myself that I`m bumping into the 10`s with NO rollbar and a 50 year old lap belt.

Really just trying to see what it can do,not looking to have 2nd race car that I don`t use.
10.999 sounds so much better than 11.000000

Glad to hear you found a issue.. so now its all
set.. right

Thanks

I hope so..... looking forward to trying the blower again.

My back is not happy with me for todays project.....setting the blower on probably would have put me down for a few days..sciatica..sux

Glad you found it,

Like I said I spun that little blower up to 6K several times with the old 933 springs, if you think about it, running easy 10's with a stock short block and unported heads in a 3700+ pound street car with mild gears is pretty impressive, I always felt like that little blower was like a '125 Nitrous shot' that I never had to refill the bottle for. I miss it, kinda sad sometimes I sold it but it went to very good hands!

Glad you figured it out Dennis!

Thanks Bob.
Now maybe I can keep up with you!