Is the 5th edition 65 JG wrong?

[William S.]

The following from my 65 JG seems to be wrong:
On page 96 under the heading "Choke Assembly, Tags, Hoses and Clamps"
and under sub heading ""Holley-L79 350 hp and L76 365 hp"
it says that the upper choke tube "is attached by means of an integral slotted bracket to the left side, rear center exhaust manifold (combination) bolt/stud with a 3/8" nut."

On my 65 L79, the upper choke tube comes out of the top of the "right side" exhaust manifold and there is no integral slotted bracket.

Can someone clarify this for me?

[Gene M.]

Re: Is the 5th edition 65 JG wrong?

Bill, On the other end of the tube that goes thru the exhaust manifold is another tube that curves around and connects with a tab to the exhaust manifold bolt. It would appear you are missing this tube and rubber hose. The system insures there is air flow thru the tubes to transport the heated air.

[William S.]

Re: Is the 5th edition 65 JG wrong?

Gene you are correct that there is another tube called the lower clean air tube that exits the bottom of the exhaust manifold. And per the 65 JG it attaches to the block with a hex head screw, not the exhaust manifold. That is how mine is. So my question still stands regarding the upper choke tube.

[John H.]

Re: Is the 5th edition 65 JG wrong?

Gene you are correct that there is another tube called the lower clean air tube that exits the bottom of the exhaust manifold. And per the 65 JG it attaches to the block with a hex head screw, not the exhaust manifold. That is how mine is. So my question still stands regarding the upper choke tube.

Bill -

Unless there was a change I'm not aware of (and that's certainly possible), the clean air tube's only attachment to the engine (other than the press-in end at the manifold outlet flange) was common with the rearmost spark plug heat shield bracket. I don't recall any clean air tube attachment to an exhaust manifold stud (the tube is inboard of the exhaust manifold, not outboard).ChokeTubeTop.jpg

[Wayne M.]

Re: Is the 5th edition 65 JG wrong?

Gene you are correct that there is another tube called the lower clean air tube that exits the bottom of the exhaust manifold. And per the 65 JG it attaches to the block with a hex head screw, not the exhaust manifold. That is how mine is. So my question still stands regarding the upper choke tube.

The '65 TIM&JG description re L79 and L76 is incorrect, IMO. The attachment for the COLD clean air tube is to the LH exhaust manifold bolt with a stud on Fuel Injected small block engines only. Ref. AIM UPC L84 Sheet 5.

The upper/lower descriptives are confusing. It's cold/hot.

[Gene M.]

Re: Is the 5th edition 65 JG wrong?

The '65 TIM&JG description re L79 and L76 is incorrect, IMO. The attachment for the COLD clean air tube is to the LH exhaust manifold bolt with a stud on Fuel Injected small block engines only. Ref. AIM UPC L84 Sheet 5.

The upper/lower descriptives are confusing. It's cold/hot.

Base engine is also attached to the exhaust manifold hardware (stud). Upper one fits tight into the tube that goes thru manifold. I just don't know which tube is considered hot or cold. Since the exhaust heat is the objective to relay heat to carb. I think upper and lower is easier to follow.

Just to share, I've seen a few 350 and 365 hp engines with the same lower tube design as the base engines. But that is not to say they are correct nor wrong. May have been owner intervention.

[Wayne M.]

Re: Is the 5th edition 65 JG wrong?

Base engine is also attached to the exhaust manifold hardware (stud). ...

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Problem is that the AIM doesn't bear this out; UPC 6, sheet C2.

I just don't know which tube is considered hot or cold. Since the exhaust heat is the objective to relay heat to carb. I think upper and lower is easier to follow. ...

Easy -- as you say, heat goes into integral choke housing, so the cold tube is the one that goes from the air cleaner to the lower port on the exhaust manifold, where the air is heated.