eBay Reground Cam
I made my first attempt at degreeing a cam this past weekend. Magnum 360 block I'm attempting to rehab on the cheap. My cam core was pitted/flaked on a few lobes, plus I wanted to run a mechanical fuel pump, so I purchased a LA roller regrind off of ebay. Same seller and similar to this one: Hydraulic Roller Camshaft Mopar LA HR-268-SBMd 318 340 360 Demon b | eBay
The specs are as follows:
Advertised Duration
In. 268
Ex. 276
Duration @ .050
In. .215
Ex. .218
Valve Lift 1.5
In. .489
Ex. .503
Lobe Lift
In. .326
Ex. .335
LSA
112
After much fiddling, I finally got the degree wheel set to TDC and the flexible dial indicator mount steady. The tip of the dial indicator was centered in the pushrod cup of the lifter. The duration at .050 looked right on for the intake, but exhaust was low. I was also reading over .300 lift on the intake, but only .280 on the exhaust.
I was starting to doubt my measures. I pulled the lifters on Cylinder 1, and disassembled one. I stacked washers inside and put the lifter cup back on. I also used a magnetic base instead of the flexible one. The exhaust lifter must have been loose, because my readings came up to .290 lift, but intake stayed the same.
Now this is well below the specifications. I'm running no name Edelbrock heads I purchased from Mancini, which should be good to .550 lift. I feel I'm leaving a lot on the table.
So my question is, have I eliminated all variables to my measuring? I'm about ready to pull the cam, and try and get my money back through paypal.
I made my first attempt at degreeing a cam this past weekend. Magnum 360 block I'm attempting to rehab on the cheap. My cam core was pitted/flaked on a few lobes, plus I wanted to run a mechanical fuel pump, so I purchased a LA roller regrind off of ebay. Same seller and similar to this one: Hydraulic Roller Camshaft Mopar LA HR-268-SBMd 318 340 360 Demon b | eBay
The specs are as follows:
Advertised Duration
In. 268
Ex. 276
Duration @ .050
In. .215
Ex. .218
Valve Lift 1.5
In. .489
Ex. .503
Lobe Lift
In. .326
Ex. .335
LSA
112
After much fiddling, I finally got the degree wheel set to TDC and the flexible dial indicator mount steady. The tip of the dial indicator was centered in the pushrod cup of the lifter. The duration at .050 looked right on for the intake, but exhaust was low. I was also reading over .300 lift on the intake, but only .280 on the exhaust.
I was starting to doubt my measures. I pulled the lifters on Cylinder 1, and disassembled one. I stacked washers inside and put the lifter cup back on. I also used a magnetic base instead of the flexible one. The exhaust lifter must have been loose, because my readings came up to .290 lift, but intake stayed the same.
Now this is well below the specifications. I'm running no name Edelbrock heads I purchased from Mancini, which should be good to .550 lift. I feel I'm leaving a lot on the table.
So my question is, have I eliminated all variables to my measuring? I'm about ready to pull the cam, and try and get my money back through paypal.
