Originally Posted by hink
Zipper
I received a couple of emails about your post today and you say a lifter bore off .025 does not change much, Say you degree your cam in center line method and you were able to move the lifter bore .025 and I am sure that on a roller cam you would see quite a change in degrees when you checked it again.
Like I have said there is more of a gain correcting lifter bores on a roller cam then a flat tappet cam.
I totally agree with that, due to the aggressive ramp speed of a roller cam. I would like to go to .904's but can't see wasting the time on a stock block even though i have the equipment and knowledge to do so. I don't know what the HP gain would be by centering the lifter bores. In the 5 different 434" engine between me and my friend Jeff Russell we do have 2 Dart little "M" blks running (all injected alcohol) and donot see a lot of difference in performance, but when re-upping the engines there is more main cap walk with the stock block. all the stock blocks are hard blocked to the bottom of the water pump inlet holes, for better ring seal, which is not necessary to do on the Darts.
Zip.