1976 FJ40 Holley Carb, Offenhauser Intake Question

[Fzjrvakma]

Hey all, I'm slowly chipping away at repairing this 1976 and now I'm having issues with the accelerator cable sticking on the Holley carb where it turns 90-degrees toward the firewall. I'm wondering if I should keep the current Holley/Offenhauser setup given my issues with it seem to continue mounting. I can't find a new cable anywhere, the truck runs rich no matter what adjustments we've made on it and after being rejetted. Any general words of wisdom or direction?

 

[77mustard40]

I had a Holley on my 77 and it was fine on road but terrible when the trail turned up. I tried a Webber for a number of years but finally set my sights on going back stock. Here’s my dated story, no regrets though. Seems these days more and more are going to Holley’s Snipper EFI.

Going Aisin-details, details, details

I made the commitment some time ago to ditch the aftermarket carbs and get back to stock, or as near as possible. Down the torpedos with Holley and Weber. My 77 FJ40 has never had its original carb in the years I've owned it so here is what I have pulled together: 1/76 carb - just completed a...

forum.ih8mud.com

 

[Downey]

I'd keep the Offy, I'd get an adapter to run a Holley 350 two barrel, I'd get Downeys float bowl baffle kit for the Holley 350 (with vent chimney), and I'd get Downey's 3" longer "up-graded" throttle cable that would be a "straight-back"pull to the firewall- --easy deal.

 

[1911]

Holly four-barrel? No wonder it is running rich; way too much carb for a 2F.

 

[charliemeyer007]

Mine came with a Rochester 2bbl from like a 76 Valiant, I love this carb. I had to re-grease the leather accelerator pump cup once back in the late 90's. I bought a ultra sonic cleaner and a gallon of carb fluid so soon I'll be pulling it apart for cleaning etc - Still runs fine but I suspect it could use some maintenance along with the Delco distributor.

 

[fjwagon]

Holly four-barrel? No wonder it is running rich; way too much carb for a 2F.

The Offenhauser is supposed to compensate for that. If he goes to the oem carb then most definitely has to change out the the intake. I did see an episode on PowerNation where they used an Offenhauser intake in a straight 6. I though it was impressive on what it can do to the performance of engine.

 

[fjwagon]

Hey all, I'm slowly chipping away at repairing this 1976 and now I'm having issues with the accelerator cable sticking on the Holley carb where it turns 90-degrees toward the firewall.



View attachment 3623570

I would removing the cable assy. Check for kinks in the cable. Hopefully you not find any. If looks good curl it and and soak it in WD-40 to clean the rust off. After soaking it, he cable should slide easily.

 

[charliemeyer007]

This is my favorite tool for cables. It uses can pressure to flush the cable housing. Mine is a Yamaha I got in the 70's. WD40 makes a good flush, then use a cable lube spray to finish off the process.

https://www.amazon.com/Motion-Pro-08-0182-Cable-Luber/dp/B0012TYX9W

 

[1911]

The Offenhauser is supposed to compensate for that. If he goes to the oem carb then most definitely has to change out the the intake. I did see an episode on PowerNation where they used an Offenhauser intake in a straight 6. I though it was impressive on what it can do to the performance of engine.

I'm sure that the Offenhauser manifold flows better than the stock one, but in my experience (admittedly more with old motorcycles than with F-series engines) a better-flowing manifold and large carb cannot overcome the flow characteristics of the small valves, conservative cam timing, and the resultant low-rpm power band of an engine designed for torque like the 2F.

 

[rex in bama]

Watching this, as I’m having the same debate. Stick with the offy/Holley 350 (in great tune, nice throttle feel, but does run rich), or go back to stock (have sourced all of the parts)? I just keep rethinking pulling all of it apart when it’s running just fine

 

[Mark Jennings]

Isn’t the Offy manifold a ‘split’ manifold, like an ‘H’ pattern that splits the primaries into the upper chamber and when the secondaries open, you get a full chamber????
I always wondered how they would work on a I6….

 

[fjwagon]

Not to hijack this thread, but at first glance I noticed the the offenhauser intake and then I notice the headers and said maybe we got something. I have never seen a 2f being tested with this type hardware and much less on a dyno. So when power nation got old Ford 300 to do just that it got my attention. I know it's not a a 2f but still worth watching. Watch the first 30.

Ford 300 Turbo

When it comes to a fan favorite, Engine Power knew that nothing would satisfy the fans more than turbocharging the wildly popular Ford 300. Indestructible, reliable, and workhorse are some of the m...

www.powernationtv.com

 

[charliemeyer007]

I saw that vid when they first did it - my 84 F150 got excited.

 

[fjwagon]

Same response, especially when they got the part when they installed offenhauser intake. It give a better perspective on what it can do.

 

[ryanwk628]

The turn on your accelerator cable looks like it is too short for the application. Easy to address to allow some more relief for bend. If the brake booster and MC combo is in the way there are other Toyota options there... something you may need to do if you change carbs.

Is that the open chamber high flowing Offenhauser or the DP where the primaries and secondaries each have their own flow passages? (supposed to run on necked down primaries until you stomp on it)

Also is that valve on the forward runners attached to anything? Could it be causing a vac leak? If not using it I would just plug that manifold port.

 

[rex in bama]

Watching this, as I’m having the same debate. Stick with the offy/Holley 350 (in great tune, nice throttle feel, but does run rich), or go back to stock (have sourced all of the parts)? I just keep rethinking pulling all of it apart when it’s running just fine

Going in for a “return to stock” intake, carb, air cleaner. Will report back on the performance differences.

 

[BullHab]

Going in for a “return to stock” intake, carb, air cleaner. Will report back on the performance differences.

View attachment 3696190

Did you return to stock configuration? Looking for a report on final results.

 

[rex in bama]

Yes, back to desmogged stock, but retained the headers. Seems to run much better, less rich, no feeling of power loss. Only thing I miss is the manual choke-free starts

 

[Landcruiserfj45]

Yes, back to desmogged stock, but retained the headers. Seems to run much better, less rich, no feeling of power loss. Only thing I miss is the manual choke-free starts

View attachment 3894355

Hello from Germany,

Would you possibly sell the Offenhauser intake manifold?

Best regards,

Jürgen

 

[BullHab]

Yes, back to desmogged stock, but retained the headers. Seems to run much better, less rich, no feeling of power loss. Only thing I miss is the manual choke-free starts

View attachment 3894355

Thank you. I had the Offenhauser and Holley configuration on my previous 1981 FJ40 and it ran really well. Currently I have a 1978 with a rv cam and headers, (MAN A FRE) with the stock intake setup. It too runs really well. Of course a friend gave me an Offenhauser and 465 Holley he never installed so I am leaning to install them.