sparkwirez06

iTrader: (18)

Here's my wipe pattern using .048 shim. I have 1.33 turns preload, that should be .062 preload, Correct? How's it look?
Looking at the lifters I thought I would need a lot longer pushrod, but the seat for the pushrod is set down in.( also a z06 cam .050 smaller base circle)

corvet786c

iTrader: (6)

I used the 7.450's pushrods on my afr 205 heads. I had the 1.7 yella terras and LS7 lifters. Dont know about the morals. Now I am using the 1.7 scorpion rockers cause the yella terras broke about 5000 miles.

Here is my link:

https://ls1tech.com/forums/florida-m...r-rockers.html

sparkwirez06

iTrader: (18)

looking at a lot of posts, the 1.24 to 1.50 turns preload is acceptable, I did use a pushrod checker. just need to know if I'm leaving anything out. THANKS
I guess I'll have to keep an eye on the yt rockers.

vettenuts

iTrader: (4)

First, are you using the Morels to check wipe? If so, then the wipe will not be correct.

Second, you need more shim. You are too far to the intake side. Try taking one set of rockers and doubling the shims to see how it lays out. You can do much better then that.

Third, you have too much preload for a set of Morel lifters. 0.050" is the maximum you should run and I wouldn't rely on counting turns to get the preload. The Morels need 0.030" - 0.050" of preload and you need to be accurate.

First things first, get the wipe pattern correct. For background, with the 1.7 Yella Terra's on my AFR 205's, I needed 0.125" shims to set up the wipe pattern. Here is a link to how I set mine up: Link

sparkwirez06

iTrader: (18)

Yes, I am using the morrells,I thought the wipe pattern was good, hard to tell from pics, it's about 1/8th wide and centered on the valve stem.

vettenuts

iTrader: (4)

Your photo's don't look centered and 0.125" (1/8") is way too wide. I got mine down to 0.045", which is almost a third of yours. Try some additional shims and see how it looks. I think you will find it improves greatly. Properly set up, the YT's will provide a very narrow pattern on the valve.

Also, if you are using the valve springs and rotating the motor so the lifters are opening the valves, the wipe pattern will not be correct because the lifter plunder will depress. You either need a solid lifter or you need to install check springs and use a dial indicator to measure lift while hand rotating the rockers.

You also have too much preload on the Morel lifter you are using. I also calculate 0.077" of preload assuming 1/3 turn for tightening the bolt which is what I measured on my car. One turn is 1.25mm or 0.049" at the bolt and when corrected for the rocker ratio results in 0.077" of preload.

sparkwirez06

iTrader: (18)

I doubled the shims, .096 Here's the wipe, same pushrods, 3/4 turn to 22#
The first 3 pics are mine, the last is from vettenuts post.
Looks better to me But .038 preload?( I turned off the flash pics came out better)

sparkwirez06

iTrader: (18)

Finding shims to differ a bit in thickness, some .042, .048, .044 I picked up some brass ones at true value, they're more consistant, .050, .051, .053 guess I'll have to mic all the shims and use some emery cloth to make them consistant. at .112 the pattern seemed to go to the exhaust side.

vettenuts

iTrader: (4)

Those are looking much better (photo's to the left, #0846), however don't use brass in the final build. You need steel shims. Once you get a thickness, you can get shims at McMaster-Carr. Here is where I got mine, your part number requirement will change due to your final thickness requirement: Link

Also, as you shim the rockers up, you will need to clearance the valve covers. I had to remove the baffles and grind down all the bosses for the coil bracket holes. Until I did that, the rockers were contacting the valve cover. I can post a couple of photo's if you need them.

sparkwirez06

iTrader: (18)

I have gmpp valve covers, so clearance should not be a problem, I'll get about 60 washers maybe 32 will be the same thicknes, I'll use a dial indicator to measure my preload, THANKS

vettenuts

iTrader: (4)

Are you using the Morels to open the valve while doing this?

GTO1_OHIO

iTrader: (3)

I'm using Morels, 1.7 YTs with the supplied shim, .040 gasket, AFRs at 61cc and a pushrod length of 7.350 ( they actually measure about .019 longer then advertised though so let call it 7.37) .. any larger and we couldn't pass the leakdown.

vettenuts

iTrader: (4)

Here's the issue. Unless you are using a check spring, the plunger of the lifter will depress when you check the wipe pattern and will provide inaccurate information. You need to check with a different method.

Also, the pushrod length of 7.350 is gauge length. If you measure it from end to end it will be approximately 0.017" longer. That measurement is overall length.

chrs1313

iTrader: (24)

^ great advise...well said...that is why you shim first, use an adjustable pushrod and a checker spring at zero lash...then add the preload you want when ordering the pushrods(you can get trends in any size for around 150 and shelf sizes .025 increments for less, also specify if you want guage or overall length)...

running morels here too with .030 preload...1.7 yt's and stable up to 7k rpms

sparkwirez06

iTrader: (18)

I'm going to go thru the whole process tuesday, got about 90 washers, will put on the surface grinder and make exact, some .040 some .045 some .030, picked up 2 springs, I have the engine out now,(waiting on my oil pan from the powder coater} so Now is the time to do it. I really didn't know that the preload on the morrells was that much different from stock,I have read the turbo buick guys run them a lot only 1/8 to 1/4 turn preload!! Company in town now, have to drink beer and cook out. THANKS

vettenuts

iTrader: (4)

If the motor is out and you have check springs, use a dial indicator and rotate the rockers by hand. That way you have the correct lift. Once you have a final shim thickness, I would order a single shim for each (not stack washers).

sparkwirez06

iTrader: (18)

http://www.mcmaster.com/#catalog/116/3229/=7tbjok
I see what you mean!!

vettenuts

iTrader: (4)

I bought 11/32 ID shims from McMaster-Carr, they were within 0.002 of each other in thickness and the ID and OD were very close (not metric but very close to what is required). Mine are 0.125, part #3088A820.

If you go to round shims and then select 11/32 as the ID, these will pop up. Then just pick the thickness you need. I tried to link to it but it won't link that far down in the catalog.

sparkwirez06

iTrader: (18)

The company left, put on the check springs, shimmed it to .121
the last 2 pics from front of engine. I checked the preload with the 7.450 pushrods and got .013 so 7.475s should be right on.

vettenuts

iTrader: (4)

Looks much better