Fits GM LS1, LS2, LS6, LS7

Available in A36 Steel and 304 Stainless Steel

Stock hole sizes are:

• 1.820" to fit 1-3/4" primary tubing
• 1.940" to fit 1-7/8" primary tubing
• 2.07" to fit 2" primary tubing

Cutthroat 4x4 header flanges are Waterjet machined from 3/8" Steel or Stainless Steel NOT LASER CUT.

Proudly Made in the USA.

Don't see the size/material you need? Call us for a price. Please allow 1-2 weeks for delivery on custom orders. Stock sizes ship next day.

**NO INTERNATIONAL SHIPPING AVAILABLE FOR THIS ITEM*