The valve job would pound out very quickly. It would also beat the **** out of the locks and stem of the valve.
Went up in pressure a bit. Didn't do anything. Dropped the pressure a bit and it started fracturing the locks.
Then, after getting pissed off at the company supplying the junk, they told me "oh ****, are you using Ti retainers???? How the hell did you get those?" And I said "the dick heads who sold me the head/cam package sent them out together". "Well who the hell did you buy that **** from?" "You ya dick head".
So they sent out their fancy, latest tool steel retainers and it got worse. You could hear it on the dyno. By the third pull it was laboring. So off the dyno and back apart and this time it was beating the valve job up so fast it was stunning.
This time it wrecked a set of Ti intake valves. Knocked the coating off the stems. And coined every seat in the head so bad I couldn't save the valve job. Order a brand new set of intakes and a full set of NB seats from Kibblewhite.
I say...piss on this. These are PAC springs. I'll call them. Get a dude on the phone, tell him what's happening. Before I finish he says "are you using beehives?". I say, "well yes, I am". He says "WTF are you doing that for"? And I say " because the ***** who supposedly sorted all this **** out sent them with the heads because those springs are the **** he says". They guy at PAC says "HORSESHIT. Those springs weren't designed for that kind of stuff". So I say "well f€#k me, send me what I need".
A few days later the new stuff show up. It's a set of doubles with a pretty trick tool steel retainer. Seat pressure is only a bit higher but the spring rate is much higher (forget what it was now, but the rate was much higher). It made more power on the dyno, went faster in the car and he gets two seasons out of a valve job.
I boxed up all the junk ****, put a note in the box that explained to the guy who sold me the junk how when you breed with your mother this is what happens.
That's one reason why I will NEVER, EVER buy a loaded head. Plus the first set of valves were made incorrectly. I asked for tulip valves and got nail heads. The power loss with the nail heads was pretty good. IIRC it was nearly 40 HP at 8500.
So beehive springs we designed to go on soft, easy ramps and relatively low RPM's for the most part. That was around 2006ish. May be better beehives now, but why bother?
