I'm gathering parts for my 383 swap into my '75 Duster and have a question regarding exhaust. I have an opportunity to buy some '70 B-Body HP exhaust manifolds and am wondering how much performance loss and I can expect over a set of headers. TTI headers are not in my budget and I don't like the idea of creating "clearance" on a brand new set of headers. I'm going to pull apart the 383 that I bought, but some of the specifics I do know are that it has ~10-1 compression, ported HP heads (452...
Read more
Read more
