the difference
Senior User
Joined: Feb 2000
Posts: 335
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From: Hutto 20 mi. above Austin USA
the difference
Well I'm sure that Evan can tell ya' more about this, but since I'm already here... The 240's combustion chamber is visibly smaller than the stock 300 head, so putting it on would raise your compression. As far as gas mileage, I'm not sure, and wouldn't be surprised if it stayed the same. The only thing that I'd be worried about is pinging, but yet again, Evan could tell ya more about it than I can!
C'mon Evan let 'er rip... :-)
Chris
1982 F100 Flareside
300HD I-6
SROD 4speed
Blue & Silver
C'mon Evan let 'er rip... :-)
Chris
1982 F100 Flareside
300HD I-6
SROD 4speed
Blue & Silver
Post Fiend
Joined: Jan 2000
Posts: 5,330
Likes: 17
From: Dryden, ON, Canada
the difference
Hmm, Lets see, I'm not sure how common the 240 heads with the smaller chambers are(mine is a '66) but, mine bumped my compression ratio up to 10.25:1 form 8.4:1, and that alone is worth 10 hp, and probably 2 or 3 mpg, I never checked the mileage I was getting before I installed the 240 head, but I'm getting 26.6 on mid grade now(89 octane), and I don't get any pinging. I ported the head when I installed the header, made a big difference in the truck.
Evan MacDonald
82 F100 FlareSide
HD 300-6, 240 head
Hedman Hedder
NP435(6.69 low)
2.73 Geared 9"
Blue & Silver
Evan MacDonald
82 F100 FlareSide
HD 300-6, 240 head
Hedman Hedder
NP435(6.69 low)
2.73 Geared 9"
Blue & Silver
Post Fiend
Joined: Jan 2000
Posts: 5,330
Likes: 17
From: Dryden, ON, Canada
the difference
I think the 240 was still in trucks up untill the late 70's, the only difference other than the head is the crank and connecting rods, as the 240 has a shorter stroke than a 300.
Evan MacDonald
82 F100 FlareSide
HD 300-6, 240 head
NP435(6.69 low)
2.73 Geared 9"
Blue & Silver
Evan MacDonald
82 F100 FlareSide
HD 300-6, 240 head
NP435(6.69 low)
2.73 Geared 9"
Blue & Silver
Elder User
Joined: Nov 1999
Posts: 780
Likes: 1
the difference
How about serpentine drive differences? I'm slowly collecting parts for an upgraded EFI motor for my '91, and this should help me a narrow the search.
1. The serpentine engine uses a cast aluminum AC/Power Steering bracket which bolts horizontally into the head behind thermostat elbow, just ahead of spark plug No. 1, and again between spark plug Nos. 2 and 3. Are there any cast-in mounting bosses there, or (hopefully) drilled and tapped holes on your '66? I'm wondering if Ford designed the bracket to preexisting mounting holes, or vice-versa.
2. Does your '66 head have mounting bosses or drilled and tapped Thermactor holes at the exhaust ports? It was about that time when Ford implemented air-injection in cars, but I don't think so in pickups, which would mean I'd have to look for a Galaxie 240 head.
3. When you're running that head, what is the octane requirement a., generally, b., under load?
Eddie
1. The serpentine engine uses a cast aluminum AC/Power Steering bracket which bolts horizontally into the head behind thermostat elbow, just ahead of spark plug No. 1, and again between spark plug Nos. 2 and 3. Are there any cast-in mounting bosses there, or (hopefully) drilled and tapped holes on your '66? I'm wondering if Ford designed the bracket to preexisting mounting holes, or vice-versa.
2. Does your '66 head have mounting bosses or drilled and tapped Thermactor holes at the exhaust ports? It was about that time when Ford implemented air-injection in cars, but I don't think so in pickups, which would mean I'd have to look for a Galaxie 240 head.
3. When you're running that head, what is the octane requirement a., generally, b., under load?
Eddie
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Post Fiend
Joined: Jan 2000
Posts: 5,330
Likes: 17
From: Dryden, ON, Canada
the difference
I'll have to check that out, I'll look at it Saturday when I put the starter on the truck(I'm sitting ~50 miles away from the truck right now.) But, I think those bosses may be there. As for the thermactor system, I honestly have no clue what you are talking about, but, the 66 didn't have an airpump, and the 82 LD engine I pulled from my truck didn't have any such setup either(truck came from Mass.), the air pump was hooked into the EGR spacer, and that was it, the only thing that might have hooked the air pump into the exhaust manifold was the pipe that goes between the EGR spacer and the exhaust manifold. I am currently running 89 octane fuel, it will ping under a fairly heavy load, but, not so bad that I would run 91 all the time.
Evan MacDonald
82 F100 FlareSide
HD 300-6, 240 head
Hedman Hedder
NP435(6.69 low)
2.73 Geared 9"
Blue & Silver
Evan MacDonald
82 F100 FlareSide
HD 300-6, 240 head
Hedman Hedder
NP435(6.69 low)
2.73 Geared 9"
Blue & Silver
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From: Inthepast
the difference
[font size="1" color="#FF0000"]LAST EDITED ON 28-Sep-00 AT 09:30 PM (EST)[/font][p][FONT COLOR="#0000ff" SIZE="+1" FACE="Veranda"]
I believe the 240 was available in the F-Series through the 1974 Model Year.
p.s. I'm reasonably certain that the thermactor air system was first used on the 67 model year trucks.
[/FONT]
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I believe the 240 was available in the F-Series through the 1974 Model Year.
p.s. I'm reasonably certain that the thermactor air system was first used on the 67 model year trucks.
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Elder User
Joined: Nov 1999
Posts: 780
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the difference
Thanks, fellas.
The Thermactor system is what Ford call their air injection system; everyone else alls it the "smog pump" and a few other bad names.
Basically, it's a small air pump, driven by a belt off the engine, which pressurizes a hose-manifold-nozzles system that injects fresh air into the exhaust port of the head, prior to exhaust gas entering the exhaust manifold. The oxygen-rich air promotes an "afterburner" effect on any unburned fuel leaving the engine.
The nozzles for this system screw into a cast-in boss atop the exhaust port casting, and a funcional system is absolutely vital to passing a smog test.
Eddie
The Thermactor system is what Ford call their air injection system; everyone else alls it the "smog pump" and a few other bad names.
Basically, it's a small air pump, driven by a belt off the engine, which pressurizes a hose-manifold-nozzles system that injects fresh air into the exhaust port of the head, prior to exhaust gas entering the exhaust manifold. The oxygen-rich air promotes an "afterburner" effect on any unburned fuel leaving the engine.
The nozzles for this system screw into a cast-in boss atop the exhaust port casting, and a funcional system is absolutely vital to passing a smog test.
Eddie
Post Fiend
Joined: Jan 2000
Posts: 5,330
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From: Dryden, ON, Canada
the difference
That system is enitrely new to me, I have never seen those bosses, the only openings in my head are the intake/exhaust ports and the bolt holes, no nozzles or the like, guess they're not a part of Canadian or Massachusetts emissions, as none of the local trucks I've worked on have 'em, and the engine I pulled from my truck didn't have 'em either.
Evan MacDonald
82 F100 FlareSide
HD 300-6, 240 head
Hedman Hedder
NP435(6.69 low)
2.73 Geared 9"
Blue & Silver
Evan MacDonald
82 F100 FlareSide
HD 300-6, 240 head
Hedman Hedder
NP435(6.69 low)
2.73 Geared 9"
Blue & Silver
Post Fiend
Joined: Jan 2000
Posts: 5,330
Likes: 17
From: Dryden, ON, Canada
the difference
If the one on the front is beside the thermostat housing, and goes in from the front, it is there, and the one between 2&3 is there, that's where my coil is bolted to.
Evan MacDonald
82 F100 FlareSide
HD 300-6, 240 head
NP435(6.69 low)
2.73 Geared 9"
Blue & Silver
Evan MacDonald
82 F100 FlareSide
HD 300-6, 240 head
NP435(6.69 low)
2.73 Geared 9"
Blue & Silver
Elder User
Joined: Nov 1999
Posts: 780
Likes: 1
the difference
That would be they, thanx.
The EFI engine uses electric fuel pumps, so Ford made a little change: they kept the mechanical fuel pump boss and two threaded mechanical fuel pumps bolting holes, and left the mechanical fuel pump lever arm closed, and bolted the EFI coil to one of those threaded holes.
Eddie
The EFI engine uses electric fuel pumps, so Ford made a little change: they kept the mechanical fuel pump boss and two threaded mechanical fuel pumps bolting holes, and left the mechanical fuel pump lever arm closed, and bolted the EFI coil to one of those threaded holes.
Eddie
Post Fiend
Joined: Jan 2000
Posts: 5,330
Likes: 17
From: Dryden, ON, Canada
the difference
And, to make things even more interesting, the TFI-IV ignition I had uses both, it had studs holding the fuel pump in......
Evan MacDonald
82 F100 FlareSide
HD 300-6, 240 head
NP435(6.69 low)
2.73 Geared 9"
Blue & Silver
Evan MacDonald
82 F100 FlareSide
HD 300-6, 240 head
NP435(6.69 low)
2.73 Geared 9"
Blue & Silver
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