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  #13  
Old 02-20-2011, 03:17 AM
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Re: Headers for my 5.7 Hemi

WOW the difference is just astonishing!
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  #14  
Old 02-20-2011, 03:41 PM
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Re: Headers for my 5.7 Hemi

Well, how did it go?
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Old 02-22-2011, 09:02 PM
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Re: Headers for my 5.7 Hemi

Well, I finally got the WK back today. They had to remove the headers again, because they leaked at the flanges. Seems that the flanges needed to be beveled on the upper edge, as they looked like they were on tight, but hit on a lip causing them to leak. Now, since the battery was disconnected for 3 weeks, I'll have to drive it awhile and get the PCM to relearn how I want it to drive. Unfortunately, I probably won't be able to get it out on the highway or get to do any WOT runs until next week. Right now I don't have the time and the weather is bad anyway. Also, have to wait until April/May for the dragstrip to open to see how much difference it makes at the track.

The builder said he will probably not build anymore and he did not spec. them before installing them...so it was a totally a one off custom job. Now the complete system consists (in this order) of the ceramic coated tubular headers with 3 in. collectors, modified stock head pipes (eliminating the neckdown at the flange), stock wire spun cats. merging into a 3 in. system with a 3X12 in. glasspack, then a 14589 Magnaflow muffler, and finally another 3X12 in. glasspack in the stock resonator position.
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Old 03-02-2011, 06:08 PM
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Re: Headers for my 5.7 Hemi

Nice!!!! Envy is setting in.
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Old 07-13-2013, 12:17 PM
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Re: Headers for my 5.7 Hemi

Any update on the headers? Any computer or sensor problems? Any fuel mileage increases? Your header guy ready to make another set?
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Old 07-13-2013, 09:01 PM
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Re: Headers for my 5.7 Hemi

It's been almost 2 1/2 years since I had the headers and exhaust system done. Just the headers and exhaust were worth almost 2 mpg and .3 seconds off the quarter mile time. Since doing the headers I've also changed the cam (FRI Engineering Sidewinder) and valvetrain (all 6.1), advanced it 2 degrees from "straight up", an SLP 25% Underdrive Pulley, and a BBK true 85mm throttle body. My highway fuel economy (since stock) has gone from 17-18 mpg to 20-24 mpg, with a normal between 21-22 mpg. Went to the drags a week ago and the old WK is now a full second quicker than it was stock.

I have never gotten any codes, and have only blown a header flange gasket on a long trip. Couldn't find anyone that wanted to tackle the fix, so had to drive it almost 900 miles that way. Still got just at 20 mpg for the whole trip, even though the leaky gasket would cause it to run rich on that bank. The problem was my own fault for not retorquing the bolts when I should have. I put better gaskets on it and put a dab of thread lock on all the bolts. It kind of pissed me off because I rarely drive it at elevations lower than about 2500 ft. This trip took me to the coast and would have been great to see how it would really do at or near sea level. I will say that the performance at sea level is considerably better than it is at the local (3000 ft.) dragstrip.

If you want to give the guy a call, go for it. Don't think he'll do another set, at least not unless the vehicle is in his shop. Tell Tom that Adrian referred you. Good luck!

Boise Auto Repair and Car Repairs @ Ammerman's Custom Exhaust
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Old 07-22-2013, 09:33 AM
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Re: Headers for my 5.7 Hemi

Ive done the same thing. heres a protip about blowing header gaskets. Have the shop cut right through in between 2 & 3 and it will release the stress and level out on the block. Ive got through a set of SRT gaskets and Cometic as well with this problem. I went back with Cometic again and the flanges cut down the middle and it fixed the problem.

Man, I never forget the look and embarrasment I felt having people stare at me while riding around with blown header gaskets.
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  #20  
Old 07-22-2013, 11:41 AM
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Re: Headers for my 5.7 Hemi

Thanks for the tip. I check the bolts more often now, but if I ever have the problem again, I'll give it a try. Big hassle to remove the headers though.
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Old 07-22-2013, 12:12 PM
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Re: Headers for my 5.7 Hemi

Yes it is a HUGE hassle and honestly if I had to do it again Id pass on headers. The clearance is so bad on the left side that the subframe has to be dropped. It makes sense though. The block is aluminum and the headers are steel. Having the flange on the headers split helps with the seal when heating up and cooling.


And also, like many others who've had headers put on, the shop I went to basically siad not to tell my friends. Lol. They lost money on my job.
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Old 07-22-2013, 04:12 PM
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Re: Headers for my 5.7 Hemi

Yep, my guy lost money too. For the number of hours he put in on it, I'll bet his hourly rate ended up being less than $15/hr.

I'd never pass on the headers. A good set makes too big a difference. I've had them, either aftermarket or custom made on almost every "potential semi performance hot rod" I've ever owned. I even had custom ones built for my old 66 GMC, 351 V-6 boat anchor engine. Also, machined the intake manifold from a 2 bbl. carburator, so it would accept a 4 bbl carb, because no one made a 4 bbl. manifold for those slugs. It hauled a camper around so definitely needed something to make it breathe better.
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  #23  
Old 10-08-2013, 10:01 AM
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Re: Headers for my 5.7 Hemi

Quote:
Originally Posted by jeepgcoman View Post
It's been almost 2 1/2 years since I had the headers and exhaust system done. Just the headers and exhaust were worth almost 2 mpg and .3 seconds off the quarter mile time. Since doing the headers I've also changed the cam (FRI Engineering Sidewinder) and valvetrain (all 6.1), advanced it 2 degrees from "straight up", an SLP 25% Underdrive Pulley, and a BBK true 85mm throttle body. My highway fuel economy (since stock) has gone from 17-18 mpg to 20-24 mpg, with a normal between 21-22 mpg. Went to the drags a week ago and the old WK is now a full second quicker than it was stock.

I have never gotten any codes, and have only blown a header flange gasket on a long trip. Couldn't find anyone that wanted to tackle the fix, so had to drive it almost 900 miles that way. Still got just at 20 mpg for the whole trip, even though the leaky gasket would cause it to run rich on that bank. The problem was my own fault for not retorquing the bolts when I should have. I put better gaskets on it and put a dab of thread lock on all the bolts. It kind of pissed me off because I rarely drive it at elevations lower than about 2500 ft. This trip took me to the coast and would have been great to see how it would really do at or near sea level. I will say that the performance at sea level is considerably better than it is at the local (3000 ft.) dragstrip.

If you want to give the guy a call, go for it. Don't think he'll do another set, at least not unless the vehicle is in his shop. Tell Tom that Adrian referred you. Good luck!

Boise Auto Repair and Car Repairs @ Ammerman's Custom Exhaust
hi, sorry to drag an old topic back up but i was just wondering if you have any info or baseline/ rules of thumb tips with regards to cams. mine is a 05 4.7 though, but any info is appreciated.
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Old 10-08-2013, 11:30 AM
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Re: Headers for my 5.7 Hemi

Basically, it depends on what your goals are going to be. Mine was a combination of better performance and, hopefully, better fuel economy. I accomplished both. Most camshafts in today's engines are designed for the average Joe putting smoothly around town and, in most cases, there's lots of room for improvement. Most also get their maximum performance (torque and horsepower) above 4000 RPM. Aftermarket cams usually move it a little higher yet. That's why, if you go aftermaket, it's important to not go to radical or you'll loose power and economy. Been there done that with a 350 Chevy. Sounded neat, but was a real tur_.

IMO, there are lots of ways to improve on the stock WK's, no matter which engine you're dealing with....even the 6.1's. One of the main goals is to increase the engine's volumetric efficiency (VE)......moving the air/fuel mixture through the engine and out the tailpipe with the least restriction possible. I started with the "easiest" stuff first.....intake (modified stock setup), exhaust (custom headers/cat. back), slight mods. to the transmission, and tuners. Next I went to the higher lift, longer duration camshaft, and advanced it, against everyone's recommendations.

I have now advanced the stock/aftermarket cams on 3 engines, all with positive results. My first was a 250 cu. in. 6 cylinder, close ratio 4 speed, Holley 4 bbl. carb. and headers. I advanced the cam in it by one tooth. It could easily beat most stock, or slightly modified 327/350 Chevys. The next was the Hemi WK, which I only advanced 2 degrees (Crower Advance Kit), so I could make sure it worked properly with the longer duration, higher lift cam that I was installing. After seeing it worked fine, I installed the same cam in my Hemi LX, except I advanced it a full 6 degrees. Results for the WK are outlined above, and for the LX, it seldom gets under 27 mpg (usually 28-30), but the top end is not quite as good as it would be if the cam were installed "straight up". Not a problem, since mine and most of everyones' driving is in the low and mid ranges. As an example, with the same cams in both my Hemi's, when the RPM hits ~3000 RPM, it's like another engine is being turned on.

By far, I am not a wizard on cams, but I can tell you that if you increase the engine's VE, AND lower the torque curve to an RPM that is closer to the RPM range you drive in most of the time, your performance and economy (in that range) will improve. I did a thread that addressed this, (Mods for the Adventurous Experimenters) but to my knowledge no one has given it a try. As far as economy goes, I get better highway fuel economy (with the WK) driving in 4th gear (~2200-2400 RPM) than I get in 5th gear at ~1800-1900 RPM. One of the reasons is because the RPM range is closer to the torque curve.

What I would recommend is that you study the cam specs. in your vehicle, and figure out how many degrees advancing it (both cam gears) one tooth would would be. If it's around 6-8 degrees (the Hemi's is right at 7) it may be worth giving it a try, especially if you're into experimenting...like I am. I know, if I ever have to open the front of my WK Hemi again, I'll be advancing it to 6*, like the LX.

On your 4.7 (overhead cams?) I think advancing the cams may be a little easier than on the 5.7, if the timing gears are easily assessible. May be something to think about.
Let me know what you end up doing.
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