Hi Beachflyer,
Mushroom lifters are a must for the NE series of motors. The camshaft lift was increased from .150" to .186" on the NE motors and the increased lift causes the 10 MM lifter to cut into the camshaft lobes. The solution is simple, just increase the lifter base size to .500" and the lifter "rolls" over the lobe instead of "dancing" down the ramp. Early NE motors employed softened lifters in an effort to match the metal hardness and managed to save the camshaft, but the lifters wore quickly. The later NE motors had mushroom lifters, however they were way too heavy and often the base wasn't level [lifter clearance varied as the lifter rotated]. The factory mushroom lifters can be modified to work well. I have had several hundreds of mushroom lifters made for the earlier motors, and still have a few sets left from the last run of chromeoly mushroom lifters somewhere in the stock room. Most likely all motors with the aluminum intake manifold also had the factory mushroom lifters.
have fun,
Mushroom lifters are a must for the NE series of motors. The camshaft lift was increased from .150" to .186" on the NE motors and the increased lift causes the 10 MM lifter to cut into the camshaft lobes. The solution is simple, just increase the lifter base size to .500" and the lifter "rolls" over the lobe instead of "dancing" down the ramp. Early NE motors employed softened lifters in an effort to match the metal hardness and managed to save the camshaft, but the lifters wore quickly. The later NE motors had mushroom lifters, however they were way too heavy and often the base wasn't level [lifter clearance varied as the lifter rotated]. The factory mushroom lifters can be modified to work well. I have had several hundreds of mushroom lifters made for the earlier motors, and still have a few sets left from the last run of chromeoly mushroom lifters somewhere in the stock room. Most likely all motors with the aluminum intake manifold also had the factory mushroom lifters.
have fun,
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