jblankenship

iTrader: (5)

Here's another thought, because to be honest these look starved for oil just like spun bearings? How is the cars oil pressure? Are restricted push rods being used? Also, even with the oiling flats, if the bushing were sunk to deep, would oil get to the bushing?

jblankenship

iTrader: (5)

After looking at more pics of the old style vs new, it is clear the old style directed the oil to the bushing. The new style allows oil to get to the bushing but it does not direct it there. The old style also looks like it would fight deflection better with the two oil channels vs the big gap of the new style.

brobinson216

iTrader: (11)

No attitude on my end.

As far as the bushings being set too deep, that is not the case.

Root cause has been determined and will be released in a few days.

brobinson216

iTrader: (11)

OP on this LS2 is 47-49 cold and 35-40 hot.

PR are comp 5/16 .080 wall

2xLS1

iTrader: (25)

Who will be releasing the info?

brobinson216

iTrader: (11)

I will as time permits.

plan on measurements again first of the week.

It looks as if the flat edges pulled material from the bronze during press, in which that material rolled to the bottom of the trunion.

VortecBlazer

iTrader: (1)

That's what I thought also when I compared the two. Seems the old style would give better oiling to the bushing. I know it was advised the new design gives the same volume of oil but they don't seem to direct the oil there which could cause them not to get oil properly. The new style would not get oil if the bushing was pressed to far, but the old style would seem to make a difference.

DietCoke

iTrader: (18)

Just plain ol btr 660 springs, with a .050 shim intake and .010 exhaust.

finewayne

it's a great kit hands down

mOtOrHeAd MiKe

iTrader: (8)

And here I thought Vin Diesel was the Last Witch Hunter?

427

iTrader: (3)

Galling typically happens from dry start, that could happen on install or if something sits long periods. They should still get oil with either design, but I think the first design interfered with stock bolts. Even sinking the bushings won't cut oil flow as the flat extends under the bolt.

Kurt

DANOZ28

iTrader: (1)

fyi theres a group purchase going on right now for this kit. im in! anyone know where i could pick up a set of ls1 rockers so i can keep my stockers? thx

2xLS1

iTrader: (25)

I don't see why machining the top flat for the bolt necessitated changing the oil channel for the bushing. I can see where it made the machining process easier for the whole trunion shaft, but not necessary. I wish I had bought some before they changed the design. Now I think I'll just keep my stock ones. Seems to me that as long as the stock ones stay intact and don't spill their bearings there is nothing wrong with them.

brobinson216

iTrader: (11)

Almost

The Alchemist

iTrader: (19)

...so is this 'As the trunions turn..." the latest soap opera?

MuhThugga

It is one complaint so far. I wouldn't go so far as to write off the entire design.

2xLS1

iTrader: (25)

I'd like to see pics of others with no problems after running the second design. I believe so far all the other no problem after running pics have been of the first design.

427

iTrader: (3)

The stock ones are great if your lift does not exceed the travel of the cap. The bearings normally come out when run into valve toss. I have a set on my truck that are at 170,000 miles, but its had valve springs 3 times.

Kurt

mOtOrHeAd MiKe

iTrader: (8)

Exactly. If you exceed the design limitations of the stock trunnions you have to make a choice. As we have seen the aftermarket bearing upgrades have had questionable results, bushings are the new new and offer their own compromises (or not). The jury is still out on the bearing vs. bushing debate - regardless if it moves, it is a wear part. Period.

I do find humour in anyone seeking to find fault in a budget part when it fails, especially when they lay claim to enough "expertise" to quote very specific material specs, principles, and assembly tolerances. I know that if I had access to those resources I wouldn't be messing around with modified stock junk, and then get upset when it doesn't perform up to my expectations. But, that is just me.

Mercier

iTrader: (15)

I've been watching this from the sideline but have installed about 20 sets of these, new and old. On the few factory bolts that did interfere with #1 design, the bolt head was rather dragging in there but did fit if you pushed it. If the hole were .010" larger ID, no problem. Out of a box full of factory bolts, it was really easy for me to grab a set of 16 that fit just fine. Maybe 1 of 8 was a tight fit and still would have worked. I only worried that with the (rare in my experience)tight-fitting bolts you might not get an accurate torque reading.

I say this as I agree that it does not seem that the oiling design had to change to make the bolts work.

I've got a beater 4.8(236K miles and literally runs GREAT with 40PSI+ hot idle) truck now and a set each of the new bush, old bush, Comp roller, Harland Sharp roller and I am pulling a handful from each. I'll install these on the truck this weekend-ish and I'll watch them grow old with the truck and planned upgrades, each set rocking two cylinders.