I got these because I needed to fit a new High Pro intake manifold on my rebuilt engine. It's always a good idea to replace all intake bolts with every replacement because, as you'll discover from your own bittersweet experience, most standard aftermarket bolts just won't work. The included EZ Tool is handy because you can always retighten the bolts after the engine has started and the gaskets have been installed. And for the price, you just can't go wrong.