No problems here.. 251/260 @ 0.050, .671/663 on a 114. My boat gained 100-200 rpm on top and 3 mph going from shelf Crane 138631 solid roller cams to to custom hydraulics. Used the old solid cams as a starting point to convert to hydraulic since I was happy with those cams.

I was happy with bolt the shelf and custom cams...I got tired of lashing valves every year.

I have no comment about Johnson's as I use the Morels and have no issues. If you want somebody who has tested all brands I would call up to PAC springs. Ask for Matt in the performance division. Petersen Spring has the the equipment and money to do any testing they want to do. They tested Shaver, Morel, Gaterman, Johnson, and Johnson Hylift. They decided on Morel to go in their product line.

Morels require GM's lifter to bore tolerance to function correctly. That tolerance is .0015 to .0018". Over or under this number there can be issues. This is the clearance that allows the Morel to function correctly.

Oil viscosity. Morel does not like anything heavier than a 15W40. The std in the marine world is a 20W50. The Morels don't function well with this oil. We are testing some oil from Shafer in a .903" hyd roller build in the next few weeks. We have been recommending the Mobil 1 High Mileage 10W40 oil.

The huge advantage Morel has over most is the available .750" wheel. You have a greater load bearing area with the larger wheel. This and the live axle. Morel has taken technology developed with NASCAR and implemented it in their other lifters. The live axle spins in the bore and is held with a wire loc retaining system. When the roller hits the lobe it stops spinning. This allows the axle to constantly change the load area giving the lifter greater endurance. A swedge axle never moves and is loaded in the same area every time.

Bingo. these are the results you should be striving for.

Do the morel lifters work well with a straight 40w oil?

Isky now uses Johnson lifters:
http://www.iskycams.com/downloads/ISKY-HPxSeriese.pdf

Teague now uses Johnson Lifters:
http://teaguecustommarine.com/em0011...r-lifters.html

Crower too:
http://www.crower.com/lifters/roller...c.html?cat=427

Johnson Lifters list of distributors from their website:
http://johnsonlifters.com/Distributors.aspx

For guys that aren't comfortable running 10/40 or lighter, I have never had a problem with Amsoil dominator 15/50 and Morel lifters.

Heres a good example.

I know of many guys, who back in the day, had the merc 454 420hp packages. This was a flat tappet engine, with a mild performance crane flat tappet. I know of a bunch of these guys who got sucked into custom hyd roller cams, since in todays world, if its not a roller cam, it belongs in a minivan. Anyhow, they bought two sets of lifters for 1,200 plus dollars. They bought two custom billet roller camshafts, another 1,000 dollars. New pushrods, and few other goodies. Some had to pay a shop to pull engines to be able to do the swap. All because their cam guy assured them how antiquated their stock cams were, how superior the roller setup is, and so on. So, they had 3k plus dollars in swapping out cams. You know what these guys averaged for speed gains from a cam change? 1-2mph!!!

For 3k dollars, those guys could have left the engines stock, bolted on a pair of used 250 blowers, and enjoyed speed increases in excess of 10mph, as that has been proven performing combo for years.

Am i saying you cant see a gain from better designed cam, not at all. But be careful what you read on the internet. This "i gained this, and i gained that" speculation based on the boats performance, without hard dyno data, can be misleading. The entire purpose to dyno test is to capture data, and use that data. Increasing or decreasing power, whether its from a degree of timing , or swapping a cam, or carb, is all capturing data. Most guys change ONE thing at a time between dyno sweeps. Doing a cam and carb swap at one time, and finding 30hp is great. But going on the internet and saying the cam change got you 30hp, is a bit skewed.

Good info. Heres a list of morel dealers.

this may be a little off topic but i believe johnson makes the lifters that get installed in the gm ls supercharged corvette engine.can anyone confirm that,maybe scott.[horsepower1].

I heard they were tested for use in the Presidential limousine.

My friend used the Johnson's for his builds last winter. Everything seemed to work good once we got the bugs worked out. A few of the lifters refused to pump up upon start-up and would not release. We had to adjust them on the engine while it was running to get them to pump up properly. Once that issue was solved they seemed to run just fine.

I'm running the Morel 5045. Seem to be good so far!