Why isn't there a mounting ear at the end of the manifold so you can tighten it up on my 76.
Manifold question
- Thread starter Temecula40
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F exhaust manifold mounted on a 2F head???
Nah. My 75' is like that. In the rear just past cylinder #6 there is an engine hoisting point in that hole. I would be more worried about a potential gasket misalignment there on the #1 exhaust port.
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I see what your saying on the alignment. I'm going to try and shift it to the right a hair! Thx
F and 2F had the hole by #6 for the lift hook. F heads did not have the extra exhaust flange bolt hole by #1.....
Yep, your 74 F.5 head, with it’s upgraded rocker oiling, should have the extra exhaust bolt hole....still, it’s the same as a 2F head. The photo above is a 68 to 74 exhaust manifold on a 2F head.
I don't think so. My Jan of 75' truck has the same manifolds and I believe them to be original to the truck. As far as one piece exhaust manifolds having only 1 attachment point, you may be correct. I never realized before that the 3 piece design utilized those threaded holes on the head, but now that I do I may have to pull one from my pile and swap it over when I go EFI. Thanks for pointing that out.
Same - my '76 (9/75 build) is the same as the OP, and it's original (we bought it new). Single piece manifold on the 2F head, no outer tabs...but the head does have the bolt fittings.
You have to remember, early 70s were transition years, air emission regulations were changing very quickly and for many manufacturers, tooling changes barely kept up. I imagine Toyota was just cleaning out it’s parts bin....they had the new head design but a boat load of old manifolds to use up.
I believe that yes, the F manifold installed on the F.5 or early 2F is original....but it IS an F manifold, for a 68 to 74.
In the picture above, I think I would have gotten the F manifold gasket....then you wouldn’t have the ‘ear’ flapping in the breeze (lol).
I believe that yes, the F manifold installed on the F.5 or early 2F is original....but it IS an F manifold, for a 68 to 74.
In the picture above, I think I would have gotten the F manifold gasket....then you wouldn’t have the ‘ear’ flapping in the breeze (lol).
Yeah, I figured it's transitional as well..but it seems like it wasn't a short-run outlier either. Probably semantics, but given it wasn't just used for a "half-year-parts-bin-run" but over the span of a few years (75/76/ likely into 77 it seems), it's somewhat not "an F manifold" anymore, and not really just 68-74 either....more accurately you'd technically call it the one-piece manifold used from ~68-77 on both the F and 2F. Potato/potahto...(relatively) low volume production does always make for odd things.
EDIT: Does the F manifold have the giant threaded EGR bung? Guessing not? (Not sure when EGR started) If not, kind of odd too...would mean a new casting but the "old" design.
Side note, I wonder if one could make a small "keeper" that would grab the end of the manifold for those unused bolt holes to add a bit of extra hold? Granted, I'm sure a fresh gasket in mine will be good for quite a while with a cleaned up head and manifolds.
EDIT: Does the F manifold have the giant threaded EGR bung? Guessing not? (Not sure when EGR started) If not, kind of odd too...would mean a new casting but the "old" design.
Side note, I wonder if one could make a small "keeper" that would grab the end of the manifold for those unused bolt holes to add a bit of extra hold? Granted, I'm sure a fresh gasket in mine will be good for quite a while with a cleaned up head and manifolds.
Remflex states that the user can cut away any portion of the gasket that's excess... There is no metal layer, it's all graphite.
Got curious - did a bit of P/N digging. 1/75-8/76 are the ugly ducklings in the manifold world (044-20G-U)-- older "F-style" single manifold, but with EGR fittings, and the three piece starts after that. The older pre-emissions single was 1968-12/74, under 044-20C.
Interesting that they updated the heads knowing the three-piece was on its way, but went through the trouble to re-cast the single manifold with extra fittings to run it for ~2 years.
Interesting that they updated the heads knowing the three-piece was on its way, but went through the trouble to re-cast the single manifold with extra fittings to run it for ~2 years.
Here’s a picture of my 68, original F, pre emission....
Bit more elegant looking without the extra doodads and fittings. No exhaust flapper, no fittings for the heat riser shrouds, no EGR ports. Interesting to see it out of the engine bay and cleaned up compared to my 76's.
The 68 did have I flapper, with an eternal spring and a little sheet metal box to cover....however, this manifold, the flapper rusted open some time in its previous 50 year life, so I ground off the shaft had it sandblasted and cold ceramic coated by the local powder coat shop. Just an FYI, cold ceramic goes from shinny black to flat black after a few thousand miles. But no indication of rust after 3 years of daily driving.