67 327 Problem

[John S.]

Took my 67 for a descent drive yesterday. About 180 miles. Car is 327/300 3 speed with no air. Car ran great until the last 40 miles coming back home. It was a warm day here in So Cal (high 80s). When I would hit an uphill grade the car started loosing power. The more I pressed on the gas, the more it started to miss and even back fire thru the carb (orig 3310 vac sec). My first thought (after it completely died) was vapor lock. Pulled over, took off air cleaner and checked squirters which pumped 2 nice shots! No vapor lock, and no fuel pump problem obviously. Restarted car and limped up hill and it ran great going down hill and on level ground. Up the next hill and started missing again. I was able to limp it home going slow up the hills and fast down and on level ground. My next thought was secondary ignition. Checked plugs, dwell, and timing (10 deg @ idle 36 at full advance). I have packard wires on the car. ANy ideas?

[Wayne W.]

Re: 67 327 Problem

Took my 67 for a descent drive yesterday. About 180 miles. Car is 327/300 3 speed with no air. Car ran great until the last 40 miles coming back home. It was a warm day here in So Cal (high 80s). When I would hit an uphill grade the car started loosing power. The more I pressed on the gas, the more it started to miss and even back fire thru the carb (orig 3310 vac sec). My first thought (after it completely died) was vapor lock. Pulled over, took off air cleaner and checked squirters which pumped 2 nice shots! No vapor lock, and no fuel pump problem obviously. Restarted car and limped up hill and it ran great going down hill and on level ground. Up the next hill and started missing again. I was able to limp it home going slow up the hills and fast down and on level ground. My next thought was secondary ignition. Checked plugs, dwell, and timing (10 deg @ idle 36 at full advance). I have packard wires on the car. ANy ideas?

Check the fuel filter.

[Tom H.]

Re: 67 327 Problem

Maybe the pickup in the tank ??? Restricted fuel delivery on the hills ??

[John S.]

Re: 67 327 Problem

Forgot to mention that car was in Reno Nevada at a higher elevation. However when I checked the plugs they were all a perfect light tan color. Car was restored down here (So Cal) in the 90s. Car was in Reno for just a few years. I doubt the jets were changed.

[John S.]

Re: 67 327 Problem

I will be checking float levels and fuel filter next!

[Gerard F.]

Re: 67 327 Problem

John,

After you check your fuel system, maybe set your initial advance back to 6 and try it. Especially if you have a 67 distributor, which has a little higher advance with speed than others.

I think the stock initial setting for a 67 327/300 is 6 d BTDC.

[Edward J.]

Re: 67 327 Problem

John,
Ive Been Repairing Cars For 38yrs. If The Car Is Suspect Of Running Out Of Fuel ,A Easy Check Is A Quick Road Test, Put The Pedal To The Metal On Open Road If Filter Or Filters (fuel Sender- Screen) Is Pluged It Will Nose Dive When Carb. Runs Out Of Fuel. If That Tests Ok I Would Check The Float Level -there Is A Float Level Gage That Works Externally, But I Dont Know If You Find One. Ive Had Mine For A Number Of Years-it Fits Into The Opening Next To Carb Stud and Rests On Top Of Float,its Like A Plastic Stick W/ Measurements In 32ths.

[John S.]

Re: 67 327 Problem

Doesn't the stock 3310 Holley have plugs to remove on side of the bowl? Adjustment is with a screw driver and 5/8 wrench?
John

[Edward J.]

Re: 67 327 Problem

yes ,you are correct I had quadrajet jet on my mine.

[John S.]

Re: 67 327 Problem

Edward,
I just went out and checked. I guess the original car (mine is supposed to be original) did not come with the sight whole and adjuster. I know that even though this is a 3310 carb, it is not dual feed either like I am used to! I guess I will be learning more about the adjustment of an early Holly. Also, I looked for a filter and can not find one. I know there is a sintered one up in the carb. Are there any in filters?

[Gerard F.]

Re: 67 327 Problem

John,

Are you sure it isn't a 3810, which is stock for a 67 s/b. If it is, the floats are not externally adjustable, and there is no sight hole in the side of the bowl.

To adjust the floats you have to take the bowl off and adjust the floats to spec.

[John S.]

Re: 67 327 Problem

Jerry,
My mistake. I guess I should put on my glasses first next time. It is indeed a 3810 carb. Do you have any idea on the float settings for both primary and secondary? Thanks for the help.
John

[Edward J.]

Re: 67 327 Problem

John
the chances of it being a float problem isnt likely, if this problem justed arrived float levels dont drop as a rule, check out the road test first , the more likely problem could be fuel related, filter, pump, fuel line rubber hose clasped ,fuel tank screen on end of sender.

[Gerard F.]

Re: 67 327 Problem

John,

The measurements are 5/16" for the primary, and 11/32" for the secondary, but you will have to get the instructions from a carb kit or the 67 Overhaul Manual to see where the measurements are taken from. As I remember the measurement is taken with the bowl upside down and from the float to the top of the bowl.

Before you start tearing into the carb, check out the other things indicated above, filter, timing, and the exhaust heat riser. The filter is within the connection of the fuel line to the primary bowl.

If your heat riser is not working properly, it is forcing exhaust gas through the heat slot in the manifold which is just under the carb. On a long trip this is basically cooking your carb, and boiling the fuel in the primary fuel bowl. This could be your problem on a hill.

If you ever pull your carb from the manifold, it is a good idea to plug the holes in the heat slot. Lots of info in the archives on this.

If your plugs look good, it is probably not an ignition problem, but it could be timing (detonation under load), and and of course, fuel delivery.

[John S.]

Re: 67 327 Problem

Jerry,
I have checked heat riser function. With the car warmed up the buterfly is closed at idle. When you give it gas it opens up.
John