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Ï pulled the lifters out and found that one lifter must have been holding air in its bore. The supplier wanted me to send the set back in for a replacement set of Morels whick i agreed to.Ï did not disassemble it to confirm my suspicion because I wanted the supplier to see it.
I think that's a good choice going with the 6504 Morels. The LS7 lifters in my current build has the sewing machine sound with .070 preload. Just bought some PRC 225 heads along with a TSP .V4 Torquer cam and I'm going back and forth on the expensive Johnson 2110's or the Morel 6504 for half the price.
Martin (formally) from Tick Performance has built some 500rwhp n/a engines with the Morels. He says to shoot for a .060 preload with the Morels but that's probably aluminum block and aluminum heads. The instructions that come with the lifters say for an iron block aluminum heads is a .030 to .035 preload and .045 to .050 for all aluminum. You may want to check with your vendor on the preload but it looks like you may be using shorter pushrods
Below is not a good way for adjusting preload but the specs at the bottom of the page has the desired preload.
My order shows that the 6504 is the LS7 style lifter. Ï hope they offer more variation on preload though. After the valve job on the heads, my valve heights vary up to .020" across the board.
My order shows that the 6504 is the LS7 style lifter. Ï hope they offer more variation on preload though. After the valve job on the heads, my valve heights vary up to .020" across the board.
What I've read about the Morel 6504 the plunger travels .120 and builders try to hit the mid mark at .060 preload. Just remember that is with the aluminum LS1 block so I'd guess with iron you probably be in the plunger mid range around .045
Ï just had the long valve stem heights ground to be within .010" of each other. New Morel lifters just arrived. Anybody have experience with the 6504's? I just unboxed them, covered in cardboard dust, and found all lifters to be pumped up to the point that I cannot compress them any while bench testing. Is it normal that you cannot compress them at all with body weight?
Ï just had the long valve stem heights ground to be within .010" of each other. New Morel lifters just arrived. Anybody have experience with the 6504's? I just unboxed them, covered in cardboard dust, and found all lifters to be pumped up to the point that I cannot compress them any while bench testing. Is it normal that you cannot compress them at all with body weight?
My Morel 6504 lifters will arrive Monday along with some other goodies
The Street Performance hydraulic lifters are made from a cold formed body with a clipped axle and have 6500RPM capability. These lifters have .120” plunger travel and have an 80% fill rate with the testoil. The lifter wheels in this series are .700” diameter. Recommended Spring Pressure 100-180lbs Seat pressure 280-380lbs Open pressure.
Installing and Adjusting Morel Hydraulic Lifters:
1.Do not wash in any solvent. Wipe the parts off with a lint free towel.
2.Use 10W30 oil and lube the O.D. of the body and wheel.
found all lifters to be pumped up to the point that I cannot compress them any while bench testing. Is it normal that you cannot compress them at all with body weight?
Read post # 64 in the LS Tech link I posted earlier...
Originally Posted by freeridesnomore
I recently installed these lifters in my engine with 799 heads milled .030 using the LS9 Gasket. I checked each lifter prior to installation on how stiff the plunger was. None of the plungers would even move with me using a pushrod and all the strength I have.
This should make finding zero lash easier since the plunger won't easily move during the checking.
I was under the impression LS7 lifters required about 0.082" preload. Full travel is 0.166", which puts it pretty much in the middle of the travel. I think BTR even recommends .100" preload (
My current setup is PRC 225's, LS7 lifters, TSP roller-rockers, and a TSP .600/.600 cam (still measuring from base-circle). I measured the preload using the CompCams tool. I did not think you could use calipers to measure the length (cannot remember where I read that or why). You had to take the advertised length from CompCams of 6.800" (all the way turned in) and add 0.050" for each turn. Then on top of that, add your desired preload value. Now, I am still in the middle of my build so I cannot tell you if what I did yields little-to-no sewing machine, but I did confirm that with my setup the calculated preload was spot on with TSP's recommendation (Post #28), which put me at 7.225" pushrods. Just adding more "here is what I did" for you.
Full Travel = 4.22 mm = 0.166 in
Preload = 2.09 mm = 0.082 in
New Morel lifters are in, heads torqued, 7.325" pushrods in. Lifter preloads range from .0494" to .0691". Not sure how I still vary .020" after I had 5 stems ground to to get valvespring height to within .015" throughout, but it is what it is... The preload values were calculated from zero lash to rocker bolts tight but not torqued. Any thoughts in regards to the preload difference and Morel' s shorter travel lifters?
New Morel lifters are in, heads torqued, 7.325" pushrods in. Lifter preloads range from .0494" to .0691". Not sure how I still vary .020" after I had 5 stems ground to to get valvespring height to within .015" throughout, but it is what it is... The preload values were calculated from zero lash to rocker bolts tight but not torqued. Any thoughts in regards to the preload difference and Morel' s shorter travel lifters?
The decks of the block are not even front to back. Everyone I have measured was off front to back.
05-12-2020, 08:51 PM
