doopdoop67
Well-Known Member
I just got my 67 dart running and driving. Now it’s time for exhaust so I thinking I’m going to put headers on my 318. Any recommendations? I’d like something that won’t be super expensive. Under $300 wold be best.
I ran into this exact problem with $$ Hooker 5208s. Made for the narrow a and the application says 273-360 but I think they are more suited for the 273/318 port size as my 340 was always blowing the bottoms out of the header gaskets and finally pulled one and checked the blow out to the flange prints and determined that the exhaust ports were larger than the "ground o-ring" sealing surface of the header flange. Boo Hooker! Either you drilled mine too low or your flanges dont fit small port heads.Hooker headers, they have a tighter exhaust port to seal against the smaller 318 exhaust ports , they are a 318/360 app
Hedmans are on the big side, they will leak out the bottoms most definitely and are for 340/360 exhaust ports only....
Bullcrap headers will be an improvement.IMO
a stock 318 will not benefit much with headers. Firstly the overlap period is only 20* and the valves at those degrees are barely open. And secondly, you didn't mention 4bbl or gears, so I'm guessing this will be a low-rpm engine, and a low exhaust gas output.
So even if you got a couple, or a few, horsepower, out of the deal, it wouldn't be until up in the high 3000s nearing 4000 rpm; so say 40mph with 2.7s. Headers might help the torque output tho from stall-rpm to maybe early/mid 3000s........ but so would HO manifolds with way less hassles.
But if you are planning gears and a 4bbl, well then put me on ignore,lol. But again not much of a power-booster, and not until the engine is really cranking.
The duals tho,with free-flowing mufflers, would be a good improvement.
IMO
I think, if it was my $300, I'd sooner put it into gears or a Torque Convertor. Those will give you way more bang for the buck.
My teener came alive with a 2800. And 3.55s brought the TM up 30% over the 2.73s that were in it, and accordingly the action started 30% sooner. Actually even better than that, cuz now it actually spun the 245 tires.
Those early 9.2cr engines make pretty good torque, having more low-rpm performance than a low-compression 360 2bbl. Meaning; it doesn't take much to wake them up, and 3.55s is plenty.
If you have an early 904, the stall on those is already about 2200. So I would do gears first.
>In your case, with the 9.2/2200 teener combo; I think I would do the upgrades in this order; gears/Suregrip, 4bbl, tires, headers/dual exhaust, stall, small-cam.
>But if you have an 8.0 low-C teener with a 2000TC, then; gears, stall, tires, HO manifolds/dual exhaust, 4bbl, SureGrip, no cam unless it would be a solid flat-tappet, and with about the same net-ICA, hardly worth the cash and time for the 15hp or so that you might get.
I know you didn't ask but I know how much it hurts when I spend money and the improvement is disappointing.
Happy HotRodding
Ps; you can tell which 318 you have, by a compression test
and which year trans by the PN stamped on the passenger side pan-rail.
I’d like something that won’t be super expensive. Under $300 wold be best.
The reason I’m asking about headers is I need exhaust on the car, I plan on putting Indy RHS heads LA x on it down the road. I am look around for a 8 3/4 read endIMO
a stock 318 will not benefit much with headers. Firstly the overlap period is only 20* and the valves at those degrees are barely open. And secondly, you didn't mention 4bbl or gears, so I'm guessing this will be a low-rpm engine, and a low exhaust gas output.
So even if you got a couple, or a few, horsepower, out of the deal, it wouldn't be until up in the high 3000s nearing 4000 rpm; so say 40mph with 2.7s. Headers might help the torque output tho from stall-rpm to maybe early/mid 3000s........ but so would HO manifolds with way less hassles.
But if you are planning gears and a 4bbl, well then put me on ignore,lol. But again not much of a power-booster, and not until the engine is really cranking.
The duals tho,with free-flowing mufflers, would be a good improvement.
IMO
I think, if it was my $300, I'd sooner put it into gears or a Torque Convertor. Those will give you way more bang for the buck.
My teener came alive with a 2800. And 3.55s brought the TM up 30% over the 2.73s that were in it, and accordingly the action started 30% sooner. Actually even better than that, cuz now it actually spun the 245 tires.
Those early 9.2cr engines make pretty good torque, having more low-rpm performance than a low-compression 360 2bbl. Meaning; it doesn't take much to wake them up, and 3.55s is plenty.
If you have an early 904, the stall on those is already about 2200. So I would do gears first.
>In your case, with the 9.2/2200 teener combo; I think I would do the upgrades in this order; gears/Suregrip, 4bbl, tires, headers/dual exhaust, stall, small-cam.
>But if you have an 8.0 low-C teener with a 2000TC, then; gears, stall, tires, HO manifolds/dual exhaust, 4bbl, SureGrip, no cam unless it would be a solid flat-tappet, and with about the same net-ICA, hardly worth the cash and time for the 15hp or so that you might get.
I know you didn't ask but I know how much it hurts when I spend money and the improvement is disappointing.
Happy HotRodding
Ps; you can tell which 318 you have, by a compression test
and which year trans by the PN stamped on the passenger side pan-rail.
Well you can let people scare you with their hearsay stories that they've heard from other people or you can take it from someone with real experience. It's your choice. I'm not going to go back and forth with these guys. I've had cheap Summit headers on my car for 4 years. They work perfectly with no leaks and not one scratch on the bottom of them after hundreds of miles of Street driving and drag racing. Anyways make sure you make your decision based on facts and experience not anything else. I love my cheap Summit headers that work perfect and I'd beat people with Doug's & tti headers all the time. Don't let these guys cyber spend your money....
I got a good idea let's recommend $600 headers for a $50 318?....
Who needs to change their plugs anyway? LOL
Mine hit the rag joint and required a $200 fancy U joint in its place to get the clearance I needed. Could have got TTI headers after all that trouble and $.Sanderson dd7, 550 with ceramic coating, 360 without it. They are shorties, so you don't have to worry about dragging them.
That sucks!! Good to know though. I got the DD9 so I will see what happens...Mine hit the rag joint and required a $200 fancy U joint in its place to get the clearance I needed. Could have got TTI headers after all that trouble and $.
After crushing many sets of Hooker super comps, I went back to exhaust manifolds...
However I helped a friend build an engine with Doug's headers and they were worth trying... Wait until they are on sale or big discount to get them to save a couple hundred...
I'll post some of the cheap Summit ones so the op can get a comparison when I get a chance.look at that.. no blocking the plugs like that cheap ****..
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cheap junk
View attachment 1715177744
look how nice and high they sit. i hear dougs sit a little higher too..
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