Hooker 6901 header ground clearance

I wish I would have done this so that the poll results are public. This is good information and will help others make decisions about headers.

Thanks a lot guys.

 

The prices are the same as when I had mine done. The Blackjacks are pinched narrow at the flange mounting bolts, not wide enough for my aftermarket heads. They were ok 20 years ago when the only Ford heads available were iron stockers. Hookers are wider at the primary ports. The Blackjacks still look great. Before they were coated the header tubes measured 500* when the engine was running. After coating they measured just under 300*.

 

Mine is stock stance and wheels. Does not sit high in front and I have zero issues with 6901's.
My only regret is I wish they were Jet-Hot coated. To be remedied in the future I hope.

Seth

 

yeah tell me about it


i adjusted my rockers last night, and my headers are all rusted from sitting all winter..

never had that problem in arizona.. i guess im gonna have to take them off this summer when i get some new heads and have them coated with something to keep that from happening again..

 

Yea, and we don't get a winter here either

 

Why do folks think that is a good thing.
Many of the benefits of headers come from the fact that (uncoated) they wick heat from the engine.
When the air in your engine bay is hot, the heat is in the air, not your engine. Takes pressure off your radiator/cooling system and can make the difference between spark knock or no spark knock.
Also, even the whole thing about keeping heat in the headers adds hp by increasing scavenging baffles me.
Think about it, hot exhaust gas shrinks as it cools, requiring smaller diameter pipe to flow the same amount as it does so.
If you keep it hot, you are creating more backpressure in your pipes and need to keep the pipes bigger to flow the same. Which in turn, adds weight. If you keep your pipes small, you strangle the exhaust. Yeah it scavenges, but it can't help but slow down without larger pipes to compensate.
The whole coating thing is snake oil to take your dough.
The only reason I can see using it, is if you drive your car in winter (up north) and don't want the headers to rust. Otherwise, painted headers last for many years when done properly.
Done ranting.
Dave

 

The heat stays in the headers and goes right out the tailpipe instead of heating the engine compartment and the intake mixture. Keeps the heat from deteriorating underhood parts like belts and hoses. Also maintains exhaust velocity for better cylinder scavaging, if your cam has enough overlap to do that. The thin steel used in header tubes does not have enough mass to "wick" away heat, they are not heatsinks.

 

I agree here. This is also the reason people wrap headers. To build velocity and keep underhood temps down .

 

header wrap is the bestestess..... IMO!

 

If they aren't heatsinks, then how do they heat your engine bay?:16suspect

 

Obviously any piece of thin steel, like a header tube, will get hot when exposed to exhaust temperatures. But the purpose of the tube is to flow away hot gases from the engine for expulsion. It's designed purpose is not to absorb and then disapate heat through it's walls. That happens, but that's a byproduct, not the intention. So it is your feeling that an engine would run more efficiently if the engine compartment is superheated? In your example, where is all of the heat that was "wicked" from the engine going to go if not into the engine compartment and right back to the surfaces of the engine, making it run warmer?

 

Like rocket science kinda stuff goin on here. Interesting.
Dan

 

The engine bay is not a static place.
The heat will and does leave the engine bay as the car is in forward motion. I don't know that I would call the engine bay 'superheated' either.
You suppose I am over rating the heat sink abilities of the headers, and I think you are over rating the ill effects of heat in the engine bay.
The truth could very well be somewhere in the middle.
IMO though, coating is snake oil.
Every dyno test I have ever seen trying to prove any benefit was either majorly flawed from a street car point of view, or the supposed gains were well within the margin of error of the dyno.
Yet the folks making the dough off the coating just keep pounding their drums.
Dave

 

I drive mine every single day with 6901's and dumps. The dumps sit even lower than the hooker's, and I still only hit under severe conditions (steep cutoff angles, tire-eating potholes. I have never come close to hitting my headers on anything, and I doubt I will even when I lower the front of the car 2".