quote:
Originally posted by jack deryke:
[B]I Even the best cam grinders occasionally need to be reminded of the weakness in the 351-C block- the gigantic oil passages connecting the lifters to the main oil galleys. Too high a lift will shove the roller wheel into the oil galley, creating a huge drop in oil pressure- 16 times per engine revolution! You avoid this problem by either running a shrouded roller lifter with a reduced diameter roller wheel, so the roller has no lifter notch to intrude in the oil galleys, or you use a reduced-base-circle cam, where the entire cam is scaled down so that high lift doesn't put a roller wheel up into the oil galleyB]
Another option (more expensive) is to bore the lifter holes, and press copper bushings with smaller holes at a higher place in it, and hone the bushings to a perfect fit for the lifter.
And there even one more option, and that is to put an oil restriction kit in your 351 block, its specially designed for this purpose.
Paul.