Not sure if they would fit in the frame, but more importantly, those headers aren't the best for an LS7. The LS7 has a different port shape and those headers are 1 3/4". If there's anything about the LS7 that isn't up to par with the rest of the motor, it's exhaust flow. It really needs 1 7/8" primary or a 1 3/4 to 1 7/8 stepped header... and even more so if you do a cam swap.
Yes i thought i would ask em to get me a weld on kit with 1 7/8" or even 2" primary pipes. But what could be difference between WD or DSE frames? Both are frontsteers etc. And take wide fronts . Scott you had a WD frame right? Have you ever compared it to DSE ?
Thanks for the link to Stainless Works. Has anyone had any experience with Hooker's Super Comp Block Hugger Header: SBC LS–1,Tube Size 1.625", Collector Size 2.5", Port Shape: Round, Ceramic coated finish? Do these limit performance? Thanks.