https://www.summitracing.com/parts/big-33130flt I've been putting off buying headers for my big block projects, but I can't resist this price with free shipping. They've been on my watch list at $357, which was 20% off. Now they're being loaded into the sleigh. I've heard/read nothing but good about these even though info is kind of hard to come by. The clincher was the shop that installed them on member jprathers car (72 SSP 400 slapstick) said they didn't have to ding anything!