Originally Posted by Jones'n
They will work just fine.
I have never seen a header not fit because of an oil pan. Lsx headers are pretty much all interchangeable.
Those headers actually look just like the ones we recently put on an '08 5.3L swap.
Thanks for getting back to me on that, im hoping those header will for for my 78 i was just wondering if the collector will be behind the engine mount, if so then it should be good to go on any 73-87 truck with a 5.3