Morel 4603's
1 - 20 of 50 Posts
Joined
·
3,681 Posts
I'm in the same boat as Todd...
Well,,, that didn't work...
Put them at 1.5 turns down exactly and then fired it up. Still noisy but a little better so I warmed it up and shut it off to go eat dinner. Came back out about 30 minutes later and it was a little hard to start. Usually it fires right off. Took off and instantly could tell it wasn't running right. It was slightly missing right about 1500-2000 rpm so I carefully limped it home and proceeded to put them back at 1 turn. Fired it up and it was back to normal.. So it seems 1 turn maybe 1.25 maxxx is all a steel headed big block can handle? I didn't want to try and mess with the carb because it ran perfect before.
Ron, you may be able to get away with it since you have aluminum heads but I would be real careful before leaning on it..
Put them at 1.5 turns down exactly and then fired it up. Still noisy but a little better so I warmed it up and shut it off to go eat dinner. Came back out about 30 minutes later and it was a little hard to start. Usually it fires right off. Took off and instantly could tell it wasn't running right. It was slightly missing right about 1500-2000 rpm so I carefully limped it home and proceeded to put them back at 1 turn. Fired it up and it was back to normal.. So it seems 1 turn maybe 1.25 maxxx is all a steel headed big block can handle? I didn't want to try and mess with the carb because it ran perfect before.
Ron, you may be able to get away with it since you have aluminum heads but I would be real careful before leaning on it..
Yes, iron heads you run less, alum heads you can run more preload. In the end, it's just going to be a factor of the sum of all the parts - lifter bores, pushrod length, cam lobe profile, bearing clearances, oil type, valve spring pressure. These all add up.
I've tried every oil from 30 wt, 5W30, 10W30, 15W40 Delo, 20/50. Right now I'm using 10/30 VR1. Lifter bores are all at 843.5 + or - a few hundredths.
Joe mentioned pushrod length. When I set this thing up I tried used the mid lift method which gave me the shortest sweep but put the roller on the out third of the valve tip. I wonder if shorter pushrods would help?
Joe mentioned pushrod length. When I set this thing up I tried used the mid lift method which gave me the shortest sweep but put the roller on the out third of the valve tip. I wonder if shorter pushrods would help?
Correct length pushrods does help - and don't be surprised if you end up with the roller tip on the outer 3 rd. But, typically, applying mid lift measuring ends up using longer pushrods, not shorter. Have you checked clearance at the retainer, stud and guide plates?
Joe, no contact anywhere..
Things I've changed.
1.Lifters. First tried Comp 854-16's and these wouldn't stay pumped up and had float issues. Pulled them out and put in Morels.
2. Cam. Went from a Extreme Energy lobe to a Magnum lobe (less lobe intensity). Slight improvement, not much.
3. Rockers. Went from Comp Ultra Pro Magnums to Scorpion Aluminum bodied rockers.
4. Distributor. Went from stock points style housing to a MSD Pro Billiet with the top oring installed to ensure no oil loss to the pass. side lifters.
5. Rocker Studs. Used the 135 dollar ARP studs so the trunion is riding completly on the stud and not the threads.
6. Double checked the oil pump pickup clearance to pan. Checked out fine.
7. Have tried adusting the valves from 1/2 turn to 1.5 turns. At 1 turn right now.
Car runs awesome but sounds horrible on a cold start or if you let the car cool off for a couple of hours. Once warm the tapping barely becomes acceptable. Not what I was expecting for my "stock appearing" 70 Chevelle SS.
I ran Comp 854's early on with a smaller cam in the 454.030, they were dead quiet. Went to Crane's on a Crane HR296 when redone as a 454.070, this was also quiet. Lifter bores were checked by Carl when I bought the block and validated to spec. 540 used a new GMPP CNC block with taller lifter bores, ran Morel lifters and a more aggressive cam profile. Was still relatively quiet, but did have a slight tick when dead cold after sitting for a while (spring pressure was 165/425). Ticking quickly went away. I think you are seeing typical behavior. I'd be more worried about a "hot" tick/tap. Try the 15/40 oil. Also, what valve covers, alum covers are quieter than steel.
The messed up thing is I know I'm not the only one with this issue. There are others who have pm'd me that are dealing with the same thing. Just wish I would have been given a heads up that this was going to be a possibilty because I would have propbably chosen a different route. Hell, my .740 lift solid roller in my Nova sound better than this thing!
Joined
·
6,489 Posts
tin covers and aluminum rockers are going to be nosier....in the Monte I ran 1 turn down....cast covers and steel rockers....it made some noise until about 200 miles and now it's totally quiet...lifter bores and pushrods are usually the main culprit Todd...
Joined
·
7,468 Posts
My is pretty loud cold quiet down when warm with the hood closed you cant hear them with it open you hear them if you know what you are listening for.
First I ran 135 lbs seat and 365 lbs open(or at least what the springs was when I had them checked) and Crane golds changed the springs so now I have 185 lbs seat and 435lbs open also changed to Crower endurance rockers and actually its quieter with this last combo. Running 3/4 of a turn, alu heads and alu covers.
Marcus
First I ran 135 lbs seat and 365 lbs open(or at least what the springs was when I had them checked) and Crane golds changed the springs so now I have 185 lbs seat and 435lbs open also changed to Crower endurance rockers and actually its quieter with this last combo. Running 3/4 of a turn, alu heads and alu covers.
Marcus
Joined
·
10,997 Posts
Hyd Rollers on my 5.3 Silverado are pretty darned quiet.
I have scorpion rockers and morels on a sbc .640" lift setup and its not that noisey. Infact my fuel injectors are louder. I only run 5/6 turn, based on hex head nut. 15w40 mobil 1 turbo diesel oil on my turbo car. Dont know why people have so much noise with these
Considered it.. That's why I changed the cam from the Etreme Energy (50* lobe instensity) to the a Magnum lobe (60* mild lobe intensity). Only made a slight improvement.
1 - 20 of 50 Posts
