Pro Series 1 flow bench valve opening fixture is a heavy duty design with black anodized finish fully adjustable. Works with V8, V6 and 4 cylinder heads, canted and straight valve applications. Will work on 4 valve heads with adapter Part No. DEL-VOF2VA2 sold separately. Mounting blocks bolt to valve cover rails bolted to a 21″ long tee bar. Teclock dial indicator reads .001″ increments up to 1.000″ lift. Please e-mail with questions.