This kit includes 16 hollow (slotted) adjustable valve lifters. These are replacements for the factory 1933-53 V8 type non-adjustable lifters. Adjusted with special lifter wrenches (see 91A-6500WRN wrench set sold separately). These will NOT fit the small V8-60 type flathead engine.
1933-53 Ford and Mercury flathead V8 passenger and truck engines (221 and 239 and 255 cubic inch)