273 hydraulic cam/pushrod/adjustable rocker combination.
Just in the process of swapping out my intake with a LD4B on my 66-273. I decided to do some preventive maintenance and check the rocker arm adjustment. The engine has and Melling 23203 hydraulic cam (specs below) with Melling MPR-155 push rods and adjustable rockers. To my surprise there was very little preload on the lifters and most were set a zero lash. Also noticed that there were a couple push rods that appeared to be bent. After removal it looks more like the top cup wasn't on straight. I did some digging and the MPR-155 should have an over all length of 7.342, mine measure 7.186. I also attached a picture of where the push-rod travels through the head, a couple of the rods that appeared to be bent were actually hitting on the head.
Any thoughts or ideas would be greatly appreciated.
Just in the process of swapping out my intake with a LD4B on my 66-273. I decided to do some preventive maintenance and check the rocker arm adjustment. The engine has and Melling 23203 hydraulic cam (specs below) with Melling MPR-155 push rods and adjustable rockers. To my surprise there was very little preload on the lifters and most were set a zero lash. Also noticed that there were a couple push rods that appeared to be bent. After removal it looks more like the top cup wasn't on straight. I did some digging and the MPR-155 should have an over all length of 7.342, mine measure 7.186. I also attached a picture of where the push-rod travels through the head, a couple of the rods that appeared to be bent were actually hitting on the head.
Any thoughts or ideas would be greatly appreciated.
- Advertised Exhaust Duration: 298 deg
- Advertised Intake Duration: 288 deg
- Basic Operating RPM Range: 2800 RPM
- Cam Type: Hydraulic Flat Tappet
- Computer Controlled Compatible: No
- Exhaust Duration at .050 inch Lift: 224 deg
- Exhaust Valve Lift: 0.466 in
- Exhaust Valve Lift with Factory Rocker Arm Ratio: 1.50 in
- Intake Duration at .050 Inch Lift: 214 deg
- Intake Valve Lift: 0.444 in
- Intake Valve Lift with Factory Rocker Arm Ratio: 1.50 in
- Lifter Type: Hydraulic
- Lobe Separation: 112 deg
