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Headers
#1
Question being, is there any advantage to putting headers on a
Cleveland? I need to get some exhaust work done and was wondering
about including headers in the setup. This car is a daily driver,
nothing special with a 351 4V quench, Holley 670 and mild cam.

mike

[Image: 1_11_11_13_11_50_27.png]
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#2
Let that rascal breath!!! I put Doug Thorley headers with doug Thorley Supper muffs for mufflers in 82 and my cleveland really came alive. They typically tell you to expect 10-15% hp gain but my motor ran significantly better.

[Image: 2rr7aiv.png]

Just cruising along minding our own business when BAM!!! The LAWS show up.
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#3
Headers, 2 1/2" mandrel bent exhaust with crossover (X or H doesn't matter) good flowing non-chambered mufflers like magnaflow or dynomax super turbos (not flowmasters) might be worth 30 or 40 hp. Wouldn't surprise me if you had to re-jet the carb.

73 conv. 460, D0VE large valve heads, Performer RPM manifold, Voodoo 227/233 cam, Holley 950 HP carb, C6 trans, 3.25 trak-loc.
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#4
I put Dougs headers and Thrush mufflers on my 73. Do your research, they were a b!@#$ to put on. Very little clearance in the engine bay afterwards. But, she sounds AWESOME.

[Image: 3483lp4.png]
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#5
All the cool kids are doing it. Smile

1973 Mach 1 Q code 351 4V, 9A paint, standard interior, 3.50 rear, C6 trans.
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#6
Especially with long tube headers (which I think we are speaking of, aren't we?) you'll lose a lot of ground clearance. Most people tend to forget that......

[Image: 1z21rv4.png]

Mike

"If I were you...... I´d rather be me."  Tongue

Check out my video:
http://www.7173mustangs.com/thread-my-mustang-in-action

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#7
I lost ground clearance. I run some hooker comps, long tube. Pain to install but it can be done without pulling the engine, you have to really lift the driver side of the car up. If you have a buddy with a lift, it would be worth it to let them do it.

Get some stage 8 locking header bolts. ALso a pain but it will keep them from loosening up.


'Mike'
73 Convertible - 351C/4V CC heads/4bolt/forged flat tops/comp 270/rhodes/mallory unilite/tri-power/hookers/glasspacks/c6/3.50 limited slip/Gear Vendors/Global West sub frames, strut rods and shelby style traction bars/ Rear sway bar/tilt steering (not original)

Pics of modifications included in:
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#8
Mike , YES YOU NEED THEM.
And an H pipe when they redo your exh. system
Don

Ohio Mustang Supply
440-949-2556

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#9
Headers are the single best cheap improvement you can make on a 4v cleveland or any motor...But specialy that 4v cleveland...ford restricted the exhaust bad in our clevelands tring to keep them tame....They love to breath with them big heads....And the H pipe makes them sound mean as hell...I dont care too much for the x pipe sound...little raspy...The H pipe gives it that nice classic low thump and bass " that i like" hehe x pipe little better on flow over all..But you really won't see too much hp diffrence between them..H or X...they both great.
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#10
Sorry guys but I have to respectfully disagree on this.

IMHO on a daily driver DO NOT DO IT. If the car is going to the track or used only on a rare occasion they may be acceptable. Headers leak at the flanges and the collectors, they rust out unless you spens mega dollars on the ceramic coated ones. I've had headers on many cars, both occasional and daily drivers and they can be a source of constant maintenance as well as the SIGNIFICANT loss of ground clearance. They produce more underhood heat and more cabin noise. Lastly if you are using a muffler that keeps cabin noise to a civilized volume I do not think headers make much of a performance or economy improvement.

On a regularly driven car it's one of the worst modifications you can do. Again IMHO. Spend the $5-600.00 you'll have into this somewhere that will make your car more fun to drive.


Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

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