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  #1  
Old August 29th, 2016, 12:06 PM
Romadoz Romadoz is offline
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Default Need help... "New M715"

Ok, so it's new to me.

Heavily modded exterior, stock engine and tranny with just under 26k original miles.

I getting a loss of power and backfiring whenever I need power to climb even a slight hill at any speed, any gear. No issues with idling or downhill.

It has the stock Holley 1920 carb on it. I took it off and cleaned it but found it to be surprisingly clean already. I've read that the 1920 floats become unusable over the years and that I have pretty much zero chance of finding a replacement but that the Holley 1945 is a suitable sub.

Help?

-Oz
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  #2  
Old August 29th, 2016, 05:54 PM
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bigprojectm715 bigprojectm715 is offline
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Did you check the timing? Not sure off hand what it should be but im sure some one can chime in...
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Old August 30th, 2016, 06:52 AM
Nailhead Nailhead is offline
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Quote:
Originally Posted by Romadoz View Post
Ok, so it's new to me.

Heavily modded exterior, stock engine and tranny with just under 26k original miles.

I getting a loss of power and backfiring whenever I need power to climb even a slight hill at any speed, any gear. No issues with idling or downhill.

It has the stock Holley 1920 carb on it. I took it off and cleaned it but found it to be surprisingly clean already. I've read that the 1920 floats become unusable over the years and that I have pretty much zero chance of finding a replacement but that the Holley 1945 is a suitable sub.

Help?

-Oz
Could what you're thinking of be a model 1940? I'm just curious in case the float in my 1920 is bad.

I wonder if your running issue might have to do with a defective vacuum advance unit.
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Old August 30th, 2016, 10:06 AM
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Don Cavey Don Cavey is offline
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Quote:
Originally Posted by Nailhead View Post
Could what you're thinking of be a model 1940? I'm just curious in case the float in my 1920 is bad.

I wonder if your running issue might have to do with a defective vacuum advance unit.
I don't think a stock ignitor has vacuum advance. However, it does have mechanical advance weights (doesn't it?).
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Old August 30th, 2016, 11:06 AM
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Quote:
Originally Posted by Don Cavey View Post
I don't think a stock ignitor has vacuum advance. However, it does have mechanical advance weights (doesn't it?).
Correct. No vacuum advance. Just mechanical. The vacuum line going to the stock igniter is for venting the ozone.
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Old August 30th, 2016, 07:09 PM
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fishtail fishtail is offline
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Check plug gaps and cleanliness, check points and condensor, check coil, and check timing. Check valve clearance, too.

Fuel, check pump and fuel tank filter sock. (might not allow full fuel at higher RPM's)

Scott
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Old August 30th, 2016, 07:51 PM
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Quote:
Originally Posted by fishtail View Post
Check plug gaps and cleanliness, check points and condensor, check coil, and check timing. Check valve clearance, too.

Fuel, check pump and fuel tank filter sock. (might not allow full fuel at higher RPM's)

Scott
Absolutely, all of the above. When those things are correct, these trucks run well. They are not exotic.
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  #8  
Old August 31st, 2016, 06:06 AM
Nailhead Nailhead is offline
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Quote:
Originally Posted by Don Cavey View Post
I don't think a stock ignitor has vacuum advance. However, it does have mechanical advance weights (doesn't it?).
Oh yeah, that's right-- mine came with a civilian distributor.

There is, however, a vacuum hardline to the distributor that makes me think the military distributor must have had a vacuum advance. That hardline looks stock, and was plugged on mine because the vacuum advance unit had been removed and replaced with a blue zip tie.

EDIT: Didn't see the venting reference above. Interesting.
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