I'm in the market for new headers. I have never been happy with the way the current ones seal against the block or against the collector flange. I think I may have a leak too. Another problem with the stock headers is that the header pipe is way too close to the bolt hole. You can barely get the smallest head bolt in there to tighten it down. I'd like to use some locking bolts but the heads on these are way too big to fit our headers. I have the AFR-195 heads. They have the standard bolt holes that all SBF heads have. However, there are additional holes, approximately 1/2 inch away from each exhaust port. So each exhaust port has four header bolt holes. So, I'm looking to buy a new set of headers. Hopefully some with the wider bolt hole pattern. Anyone replace their headers, and if so, where did you get them?