COSPEED2

iTrader: (7)

Not "slop". Lost lift or other valvetrain issues that can arise from it. It is worth a shot. You get full 360* rotation vs the stock limited travel due to the D shaped retainer. I have seen some pretty gnarly knicks on the trunions from hitting the retainers repeatedly and the retainers be banged up as well.
What is your target afr? And your inj duty cycle as the rpm goes up? And fuel pressure?

It would be a very worth while "test" at least and you are going to do it anyway. Would save alot of time and labor and money...possibly. After that, maybe an upgrade to better pushrods, although again like i said, you arent doing anything new that so many arent doing.
Is possible PTV an issue?

prokilllsx

I am clueless on the tuning questions. Tracey would be better equipped to answer those. I was wondering about PTV also and half expect to see it when the heads come off. Here's the kicker...it goes away on the dyno, when the cut-outs are opened, but not at the track, where the load is higher.

prokilllsx

Slower rate of accelleration of valvetrain parts adding to stability, maybe exhaust side issues.

COSPEED2

iTrader: (7)

Wait, you said you were seeing the problem on the dyno...now it is at the track?
That is one reason i like dynos with a load cell over ones that have none. If the heads were not properly set up or the pistons not flycut, then you very likely have ptv issues with that camshaft.

prokilllsx

Pistons have 4 cc valve reliefs. Sorry, I thought I mentioned the track, above.
It is very obvious at the track, especially while running a car that runs next to mine. In 1 day I lost to 2 different cars (by a car or less) that I would have easily beat without the float.

Sales@Tick

iTrader: (3)

Post a picture of the dyno graph.

prokilllsx

I will try to get ahold of it.

Exidous

iTrader: (11)

Aggressive lobes and solid intake valves might be the cause. Maybe some LS3 hollow intake valves turned down?

COSPEED2

iTrader: (7)

I seriously doubt that is his issue. According to the TSP site those lobes will work with beehives or duals, which somewhat implies they are not very aggressive.

Sales2@Texas-speed

iTrader: (5)

We don't don't valve float issues with that cam in general unless something else is going on. In the big scheme of things it's just not that aggressive. We prefer to run it with a good double spring vs a single but other than that we've never seen an issue with it. I've even ran it myself and didn't have any valve float issues at 20k miles with the same springs.

prokilllsx

So do you have any suggestions, sales@tsp?

nj02z

iTrader: (6)

I run that cam with there .650 springs on an otherwise stock engine. It has been good to me(11.75 at 114).

Sales2@Texas-speed

iTrader: (5)

Although possible, I'm not completely convinced you have a valve float issue just yet. Unless I'm missing something the power numbers you are listing are pretty high. It just doesn't make since to have some of the highest rwhp numbers I've ever see in an automatic N/A 346, with that setup, and have valve float. Post up a dyno graph so we can see how it looks at higher RPM.

Have you re-dynod it since getting worse? Is fuel pressure dropping off up high? Did you have the problem with the previous convertor?

prokilllsx

Yes it has been dyno'd several times. What other problem would be tearing up the new valve seals, seats and valve tips, just since the new valve springs went on 1,000 miles ago, and look just like valve float on the graph?
Sorry, I am trying to get copies of the graphs and not trying to sound crappy. It's an honest and humble question. Fuel pressure is fine. Float showing on the first dynos was the reason we swapped converters after swapping valve springs to no avail. Then we swapped push rods. Car has been dynod each of those steps, plus when I bought it to fix the tune that was wayyyy lean and again after converting the car to sd tune and losing the stock maf sensor in trade for a 90 mm id pipe.

prokilllsx

I wish you (tsp) would take the car in and figure this one out. It is surely within your scope of abilities and should be much easier while in your posession

prokilllsx

Here's the car.

prokilllsx

Here is the first dyno of the SS.
The SS is the red line, our LS1 GTA is the blue line. Engine builds are very similar but the SS has a bigger cam.
Notice the lead the SS has in both hp and tq that suddenly falls off.
After changing springs, wires, plugs, pushrods, eliminating a stock (lol) maf, and installing a speed density tune, the numbers went to 471 and 414 but the pattern is the same.
It is falling off hard around 5700 or so, and tearing up the new valve seals and even one valve tip.
Help?!

Sales@Tick

iTrader: (3)

That does not look like valve float to me.

I have been wrong before though.

JakeFusion

iTrader: (7)

Looks like the cam is advanced to get the low-end advantage over a smaller cam. I would assume compression is similar?

But it doesn't look like valve float. That's much more pronounced in how the power noses over. This just looks like it peaks a little early and holds on well.

prokilllsx

Realize that it got worse over time. That was its first pull. Here are more after more mods. There are 2 later ones that are not showing here, where it hit 464 hp and then 471 rwhp. In both of those the float was even more pronounced.
If it's not valve float then what accounts for the damage to brand new valve seals and seats?