Dress Up Your LS1 LS2 LS3 LS6 LS7 LSX 4.8L 5.3L 6.0L 6.2L Valley Cover With This Awesome Stainless Steel Allen Buttonhead Bolt Kit!! This kit is semi-polished. This kit will fit stock LS series Valley Covers for GM engines and the Fast Intakes. These bolts have a low profile to prevent damage to Aftermarket Fast Intakes. Regular Allen bolts for the Valley Cover for Fast Intakes will damage the intake if they are used. All of our washers are polished to make sure your finished project looks great!