Ad Radar
Facebook Click here to find out more!

Valve Lash Chart

  
Mopar Muscle
Item Posts    Sort Order

Valve Lash Chart

 
FD503 FD503
New User | Posts: 6 | Joined: 07/12
Posted: 07/07/12
11:00 AM

After setting valve lash as per Mopar Performance 'B-RB'. I was told that I should have gone 1/2 to 3/4 turn from zero lash. I then went back to the books and checked the Mopar Service Manual. It basically gave the same procedure and setting. If cam is less than 280 degrees duration at .050 lift, use four position method, as follows... 'Clockwise Rotation' #1 TDC (firing) Intake 2&7 Exhaust 4&8  (Rotate 180 degrees) #4 TDC (firing) Intake 1&8 Exhaust 3&6  (Rotate 180 degrees) #6 TDC (firing) Intake 3&4 Exhaust 5&7  (Rotate 180 degrees) #7 TDC (firing) Intake 5&6 Exhaust 1&2. The only difference in the two manuals for a hydraulic camshaft was Performance 'B-RB' states reduce gap at rocker tip to zero. Then turn adjusting screw down 1&1/2 to 2 turns. Mopar Service Manual states 1&1/2 turns from zero lash. I,m at 1&1/2 turns from zero lash.

Who is right who is wrong? I drove the car approximately 5 to 6 miles in town seemed ok, but now I,m afraid to drive it. Is this an acceptable setting or should I re-adjust to prevent harm to the engine?

My engine is a '73' 440 w/Edelbrock Performer heads & intake, Crane Hydraulic Roller ADV Duration 284 intake/292 exhaust - (@ .050 - 222 intake/230 exhaust) - 1.50 Crane Roller Rockers.  

I'm confused, can someone sort this out?

Thanks,
Jim Wyatt  

IQ52 IQ52
Guru | Posts: 860 | Joined: 06/10
Posted: 07/07/12
11:30 AM

Yep, it can be sorted out. But first we gotta know who's roller lifters are you using and what part number.  

69_340_GTS 69_340_GTS
Enthusiast | Posts: 535 | Joined: 06/09
Posted: 07/07/12
12:10 PM

The procedure is correct. But the number of turns from 0 is totally up to the manufacturer of the lifters. Do whatever they say to do. The Mopar books were written decades before your lifters even existed. My guess is 1/2 to 3/4 turn is correct.  

FD503 FD503
New User | Posts: 6 | Joined: 07/12
Posted: 07/07/12
03:29 PM

IQ52:
I purchased the parts for this engine several years ago. In fact, the engine has been put together for approximately four years while I finished the disc brakes, engine compartment and rebuilt the front end. All that to say, I don't know. I think I bought the the push rods and lifters from Mancini. I saw where I got the H-beam rods from them, but couldn't find any thing on the lifters. If that is a critical piece of the puzzle, i'm short that piece.

if I need to... I'll pull the valve covers, and back each lifter off a turn. Guess what bothers me the most, is I followed the Mopar Performance 'B-RB' manual step by step. I can understand if the !970 service manual is lacking when it comes to roller cams  because it's a 1970 edition, but the performance manual should be in the ball park. It actually made mention of roller cams.  

FD503 FD503
New User | Posts: 6 | Joined: 07/12
Posted: 07/07/12
04:49 PM

69_340_GTS:
The Mopar Performance 'B-RB' manual that I'm using has a copyright date of 1998. It has an extensive amount of info on Camshaft and Valve Gear (50 pages plus). It addresses roller cams, roller rockers and such. As I stated in my reply to IQ52. It specifies that for roller cams with high lift and long duration over 280 degrees at .050. Use the eight position method for the valve lash setting. Other wise use the four position method. How many different size 440 roller lifters are there?  

IQ52 IQ52
Guru | Posts: 860 | Joined: 06/10
Posted: 07/07/12
08:06 PM

Comp Cams hydraulic roller lifters would use only .000-.004" preload.

Crane, Howards and Lunati are .020-.060" or 1/2 turn.

Rotate the engine clockwise (normal rotation) until the exhaust valve begins to open, set the intake lash to zero and then set the preload to your lifter's requirement. Then rotate the engine clockwise until the intake opens all the way and closes about 1/2 way, now set the exhaust valve lash to zero and turn in the required lash. Repeat this with all eight cylinders.  

FD503 FD503
New User | Posts: 6 | Joined: 07/12
Posted: 07/08/12
08:08 AM

IQ52:
Thanks, I also found an article (Mopar Muscle January 2000) 'How To Install Hydraulic Roller Cam (Retro Roller) It also states 1/2 to 3/4 from Zero lash. I'm a turn to tight.

Thanks again,
Jim Wyatt  

69_340_GTS 69_340_GTS
Enthusiast | Posts: 535 | Joined: 06/09
Posted: 07/09/12
12:18 AM

Like I said, it depends on who made the lifters. But 1/2 to 3/4 turn is probably safe for all of them. This is not a critical thing with moderate lift cams like you have. As long as there is no free play in the valve train, it'll be O.K. (I think they say up to 2 turns because with 2 turns you can be fast & sloppy about it and not get too hung up on doing them exactly at the base circle of the cam. On stock motors with stock lifters two turns will work.)  

FD503 FD503
New User | Posts: 6 | Joined: 07/12
Posted: 07/10/12
09:59 AM

69_340_GTS:
Thanks for the help. Maybe I got to hung-up on the adjustment, but i was afraid of bending a push rod or something. I did loosen the adjustment one turn. I should now be at 1/2 turn after zero lash. I drove the car after the adjustment, and so far no taping noise. I'm out of my comfort zone with this engine. I usually build back stock. This engine has a lope at idle, and it's hard for me to determine if everything is adjusted properly or not.

Thanks again,
Jim Wyatt