Just purchased a 1940 Lincoln Zephyr. I noticed a distinct light knocking in the engine. I contacted the machine shop that performed a 6.6K rebuild for the previous owner, only 4K miles ago. I discovered the hydrolic lifters were converted to solid adjustable, he did not have very much additional information on the rebuild. This weekend I pulled the Edmunds Custom intake and took a look, nothing broken, one of the solid lifter adjusters was very loose and far too easy to adjust, I plan to use green locktite to resolve, recommendation from other post. I adjusted the lifters to intake .010-.012 and exhaust to .014-.016, according to the ford service guide, can someone confirm this is correct given the switch from hydrolic to solid? Also, the check valve and spring still remain in the front of the block, however, the rear hydrolic push rod valve has been completely removed. I have seen several post stating the rear is to be blocked and the front ball valve and spring should be removed, can someone confirm the correct set up. Should I look at anything else while the intake has been removed? Thank you for the help, new v-12 person, difficult to determine the proper valve clearance and set up given the change from hydrolic to solid.