Anybody use a set of these lately (http://www.summitracing.com/parts/hrs-91162/overview/) Theyre Howards but same thing.

Just bought another set to replace my current ones since the rollers puked and they're noisy as hell. I adjusted them for .040" preload using the usual I/E lash method and it still seems like they don't have enough preload. They do the usual thing Morel anti-pump up lifters do when misadjusted, namely run real quiet at first when the motor is cold and then bleed down and tap like hell. Just curious if anyone else has tried them lately...

I did notice that the new SBC ones I got now seem to have a full .080" of total plunger travel. Old SBC ones had .060" with the BBC ones having .080". Did they change the design and go to one style of lash mechanism? From my experience the final lash adjustment needs to leave the plunger with about .020" of remaining travel. Above that they bleed down and tap.

If they did would be nice if they'd tell you in the instructions since these things are obscenely expensive.

 

OUCH!!!! I just stuck with a factory roller cam block, factory billet roller cam and LS7 lifters this time around. Shifting at 6,200 with the old cam it didn't miss a beat and pulled it to 6,500 on the dyno. LS7s have a factory fuel shut-off at 7,100 rpm. The LS7s feel almost like solid lifters. The plunger is insanely stiff.

 

This is still my old goodwrench motor so factory roller isn't an option, unfortunately. Theyre nice lifters and with my Comp XE roller it makes power to 6k without issue. Given that even the oversize roller has a limited lifespan, I'm not sure how long a factory sized roller would last. The bigger XE rollers seem to be pretty hard on the valvetrain.

With these it seems like they're purposefully designed to bleed down above a certain height so that it cushions any valve float rather than just pumping up or letting everything crash, but if they change the plunger height no way to know until you start the motor if its set right

 

I was told morels need more preload than others. I ran one full turn on 7/16 studs. Shaft rockers now have smaller threaded adjustment but i still give it one turn. Not sure the exact preload measurement but Not noisy at all

Mine are just regular morels. No fancy anti pump or short travel

 

I found out whats wrong with them. Three of them have stuck plungers. F'n unbelievable...

This is my third set (used the car as my DD for ~8 years), and my last two looked like they were machined for the aerospace industry and worked flawlessly. Even non-crititcal surfaces had finishes better than Ra 8. This set looks like they just crammed them thru the machines. Tooling marks all over the place. So yeah, guess they're crap now like the other aftermarket stuff.