Hey gang, I'm glad this stirred up some great conversation. I'm amazed as to how polarizing the exhaust header debate is. Since the anti header sentiment seems to be more prevalent I had to put in a plug for the pro header side Ok, let me start by saying they do not belong on a "stock' or properly restored car. That said, even mildly modified engines will benefit from headers. (Have you ever taken a really good look at the D/S exh manifold design or lack there of) I want to only speak to my experience because I'm sure there are plenty of bad header stories. I have never burnt up anything under the hood in over 20 years from the headers. The paint on the hood is fine despite not having the heat pads installed. I have the rubber 'flaps" over the control arms removed to allow extra air in and out of the engine compartment. I've driven the car from northern NJ to Youngstown OH round trip 3 times (about 410 miles one way) with a passenger in the summer time with no complaints of excessive heat. We drove at or above the speed limit and only stopped for fuel. All three trips the car had different gear ratios. First 3.08, second 3.36, and third 3.55. (OK the last trip was a little noisy).
They are a little more maintenance than stock. You need to occasionally tighten the bolts, the collector flanges will eventually leak and need to be serviced, You have to build your exhaust systems. Other than the SS Flowmaster 2.5" exact fit tail pipes you are on your own. And as pointed out, they are worth the trouble if you race the car. Full disclosure I do enjoy racing mine. I've occasionally run them "uncorked' just for fun. A Nailhead with open headers is music to a Buick guy.
Thanks for letting me ramble. I'm sure I won't change anyone's opinion, but I just wanted to add my story to the pile of header stories.
Thanks!!
Jerry