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Finally got my Offy C installed w pics

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jzjames
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Finally got my Offy C installed w pics

Post #1 by jzjames » Mon Sep 09, 2013 6:09 pm

Thanks to you my friends, I think I have got this thing on finally. Take a trip over to my favorite Ford Truck forum: Fordification - for the rundown.
http://www.fordification.com/forum/view ... =3&t=73113
Please leave any suggestions from the pics or whatever. Ive still got the heated water thing to do on the bottom of the intake, but otherwise its just about done.
Had a puzzle with the throttle linkage, and had to rig up a contraption: The throttle lever on this 67 truck was right in the center of the rear of the valve cover.
Otherwise, this upgrade appears to be all its stacked up to be. Today is the first day driving.

Many thanks for all your information, generously provided, on Fordsix Performance.

Nashtooth
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Re: Finally got my Offy C installed w pics

Post #2 by Nashtooth » Mon Sep 09, 2013 10:59 pm

Nice work. You pickup people have so much more space to do your thing than us vanners. Oh well; we have cabin volume. Once you get the manifold heat you'll have one sweet and strong running ride.

jzjames
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Re: Finally got my Offy C installed w pics

Post #3 by jzjames » Tue Sep 10, 2013 12:02 pm

I forgot you may need to join the other forum to view the pics?? Thats not convenient! Anyway here's the pics here. Its a process to get them reduced so they will show.
The original "log" intake and Holly 1940 1bbl carb. going, going, gone!
Image
Placed studs in the head to mount everything up, that was a good suggestion from someone on this forum.
Image
I'm using a Motorcraft 2bbl carb with adapter. Carb has the 1.08 casting for the 300 cu. in. engine.
Image
Napa 10" aircleaner for $20, hoses, vacuum line, throttle cable. Truck drives MUCH better!
Image

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bubba22349
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Re: Finally got my Offy C installed w pics

Post #4 by bubba22349 » Tue Sep 10, 2013 12:44 pm

:beer: looks good, hows it run?
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

jzjames
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Re: Finally got my Offy C installed w pics

Post #5 by jzjames » Tue Sep 10, 2013 2:51 pm

Most noticeable is it jumps from a stop, more power overall. Everything has worked out good so far.

guhfluh
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Re: Finally got my Offy C installed w pics

Post #6 by guhfluh » Tue Sep 10, 2013 4:01 pm

I just finished a similar upgrade in my '67 F250! I used 10-32 all thread and ball ends to connect to the stock throttle linkage bar behind the head. The stock bar only needed slight bending over to the passenger side to clear the valvecover and have everything work. I used an Offy C and EFI manifolds also, but didn't use studs, though I wish I would have. Eventually I plan on changing to studs and 1/4" bar stock clamps instead of washers, as FTF suggests.

Looks good!
1967 F-250 Crew Cab 2wd, 300 6cyl, T-170/RTS/TOD 4-speed overdrive
240 head, Offy C, EFI exhaust manifolds, Comp 268H, mandrel 2.5-3" exhaust, Edelbrock 500, Pertronix ignitor and coil, recurved dizzy. 200whp/300wtq

teds74ford
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Re: Finally got my Offy C installed w pics

Post #7 by teds74ford » Wed Sep 11, 2013 10:01 pm

I used a C series and a "1.08" carb on my other truck and really liked it. The volume in the intake might be a little too large, but it is a really good combo overall. I liked the setup better than a Holley 390 I originally had on it.

guhfluh
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Re: Finally got my Offy C installed w pics

Post #8 by guhfluh » Thu Sep 12, 2013 7:13 am

I've got a Holley 390 on mine now, but its going to need some tuning to get right. It drives well at cruise and WOT, but the accellerator pump needs some major tuning...after I run coolant to the intake manifold. I'm hoping I can tune it well enough that I don't have the poor performance issues many people seem to have. I do have a wideband to tune with though.
1967 F-250 Crew Cab 2wd, 300 6cyl, T-170/RTS/TOD 4-speed overdrive
240 head, Offy C, EFI exhaust manifolds, Comp 268H, mandrel 2.5-3" exhaust, Edelbrock 500, Pertronix ignitor and coil, recurved dizzy. 200whp/300wtq

teds74ford
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Re: Finally got my Offy C installed w pics

Post #9 by teds74ford » Sat Sep 14, 2013 12:18 pm

I could never tune mine right. I sunk a bunch of $$ into it, finally switched to a 2150 and never looked back. My biggest problem was I could never tune out a med-to-full throttle stumble. If I eased into it, no problems. Punch it and it would stumble and then roar off.

keysrat
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Re: Finally got my Offy C installed w pics

Post #10 by keysrat » Mon Sep 16, 2013 8:29 pm

I see you are running a C4 auto with this. What do you plan to do for kick down linkage?

jzjames
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Re: Finally got my Offy C installed w pics

Post #11 by jzjames » Tue Sep 17, 2013 2:17 am

May run it without the kickdown, it never really worked that well for me with the stock linkages.
I think there is options for the Offy intake, but I dont know about them.
Im liking the 2100 Autolite carb, there has been no problem luckily.
I need to do a gas mileage check, but my first impressions are that it is better. I dont drive in the style that sucks alot of gas. I wouldnt mind adding a good vacuum guage.

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THE FRENCHTOWN FLYER
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Re: Finally got my Offy C installed w pics

Post #12 by THE FRENCHTOWN FLYER » Tue Sep 17, 2013 8:59 am

Because the torque curve is so flat you can easily get by without a kickdown feature. He's probably making more power with the big carb in high gear than with a 1V in kickdown.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

willowbilly3
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Re: Finally got my Offy C installed w pics

Post #13 by willowbilly3 » Sat Sep 28, 2013 10:02 am

Looks great jz. The only part I would do different is the manual choke conversion, never had much luck with those. It helps if you grind the fast idle ramp notches off. I hoard the old manual choke 2100s and use them or parts of them. O/T car but I put a pair of .98s sideways on a 302 efi intake and run them on the 260 in my roadster pickup. I modded them with manual choke parts and just have a cable to each. Works great.
Great ideas have always encountered violent opposition from mediocre minds
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tiresmoke410
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Re: Finally got my Offy C installed w pics

Post #14 by tiresmoke410 » Mon Sep 30, 2013 8:50 pm

Might want to think twice about not running the kickdown. The kickdown also raises line pressure. Without it you'll likely burn up your transmission.

Nashtooth
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Re: Finally got my Offy C installed w pics

Post #15 by Nashtooth » Tue Oct 01, 2013 11:17 pm

My C6 has been running without kickdown for years, don't know if C4s have a problem behind a built 6

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THE FRENCHTOWN FLYER
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Re: Finally got my Offy C installed w pics

Post #16 by THE FRENCHTOWN FLYER » Wed Oct 02, 2013 8:26 am

X2.

So far my 300/C6, 240/C4, and 460/C6 rides have not failed without running a kickdown feature. I don't miss it. Maybe I've been lucky?

tiresmoke410,
I am curious - what components inside the trans are subject to failure if no kickdown feature is employed? Bands and clutches, or bearings and bushings?
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

country fried 6
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Re: Finally got my Offy C installed w pics

Post #17 by country fried 6 » Thu Oct 03, 2013 12:24 pm

I have seen that repeated before. I guess back before I knew better, I ran a C4 behind a 289 in my daily driver for a couple years with no kickdown connected, never had an issue with the trans. the C4 does have a vacuum modulator, isn't that what's used regulate line pressure? the kickdown may verywell bump pressure up for the downshift but, seems like it would be no issue if it never kicksdown.
Last edited by country fried 6 on Mon Oct 07, 2013 1:23 pm, edited 1 time in total.

mutt
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Re: Finally got my Offy C installed w pics

Post #18 by mutt » Fri Oct 04, 2013 3:03 pm

the next cheap drop in (maybe) trick to leverage on your improves breathing is Chev 250 lifters. If the pushrod holes in your head flat sided rather than circular, you can pick up .035 more lift, which is step up for something whose problem is breathing. You just put a grade 8 washer between the rocker ball & the nut, or you run out of adjustment before you get that one full turn from zero lash. Its a great upgrade, like that Offy & Motorcraft.
If you have the round holes no worry, theres a pushrod guide plate made for the task.
Nothing like a mighty 300 thats free to breathe.

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woodbutcher
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Re: Finally got my Offy C installed w pics

Post #19 by woodbutcher » Fri Oct 04, 2013 10:51 pm

:hmmm: Uhhhhhhhhhhhhh.Mutt.Its the rocker arms.
Good luck.Have fun.Be safe.
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guhfluh
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Re: Finally got my Offy C installed w pics

Post #20 by guhfluh » Wed Oct 16, 2013 3:54 pm

As long as the line pressure stays high enough not to allow slippage, no kickdown or Throttle Valve cable/linkage is needed. It's when you leave the linkage off and line pressure drops enough to cause sloppy shifts and slippage that damage occurs. At least in the Chrysler transmission world...

So how is your low rpm power? Say 1000-2000rpm? I have the same Holley 390, Offy C and EFI manifolds on a stock '85 300, in my 1967 F250 Crew, backed by a T-170 overdrive. It does okay now that I've been able to tune the accellerator pump better, but still needs more tuning and heat to the intake, and it seems to lack power in that lower rpm range. I know the Offy DP is supposed to be better in the lower rpm, but I got the Offy C for $20...
1967 F-250 Crew Cab 2wd, 300 6cyl, T-170/RTS/TOD 4-speed overdrive
240 head, Offy C, EFI exhaust manifolds, Comp 268H, mandrel 2.5-3" exhaust, Edelbrock 500, Pertronix ignitor and coil, recurved dizzy. 200whp/300wtq

jzjames
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Re: Finally got my Offy C installed w pics

Post #21 by jzjames » Thu Oct 17, 2013 7:42 pm

"Offy C for $20",
oh man! some guys have the kind of luck I like to get.
Well for mine, the Offy C seems to have BETTER power in the low RPMs than the high. I also had heard that it should be the other way around. The rear end in my F100 is 3.70 so I do not expect to do high speeds, but the power is most noticeable in the low rpms.

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Re: Finally got my Offy C installed w pics

Post #22 by guhfluh » Thu Oct 17, 2013 8:15 pm

Hmmm, strange.

I have 3.73 gears in mine, so its not too bad with the overdrive trans at high speed, but the powerband seems lacking a little down low. I do still need more tuning with the carb though, and I haven't recurved the distributor yet either, so it may get a lot better by the time I finish tuning.

***I just thought about it again, and it may be because you have an auto and a its a good match with the converter stall and where your powerband starts at around 2000rpm. I can lug the engine lower than you can with my manual trans.
1967 F-250 Crew Cab 2wd, 300 6cyl, T-170/RTS/TOD 4-speed overdrive
240 head, Offy C, EFI exhaust manifolds, Comp 268H, mandrel 2.5-3" exhaust, Edelbrock 500, Pertronix ignitor and coil, recurved dizzy. 200whp/300wtq

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