1965 327-300 loss of power.

[Richard D.]

Re: 1965 327-300 loss of power.

Chip Thanks for the advice, I am planning on draining the oil and changing the filter before I start the engine with the new fuel pump. I will change to a magnetic drain plug. I can't believe this happened with only 5000 miles on the motor since the rebuild in 2007.

[Richard D.]

Re: 1965 327-300 loss of power.

I tried to attach a couple of photos of the fuel pump. The pump on the right hand side is the pump that failed due to a missing drift pin and broken spring. The pump on the left hand side was the pump previously installed in the car prior to the engine rebuild. The old pump was made in Canada and the newer pump which failed was an AC Delco replacement pump made in the U.S. Its difficult to see from the pictures but the newer pump spring appears to be made from a smaller diameter spring steel. The Canadian spring is a heavier gauge metal. the second picture depicts the missing drift pin in the pump on the right side, you can see the red flashlight color from behind the pump thru the hole.
100_0392.jpg100_0394.jpg100_0395.jpg

[Richard D.]

Re: 1965 327-300 loss of power.

I just received my replacement pump from L.I. Corvette(part# 6415616) and I have one more observation. The GM replacement part# is 6415616 which is different from the GM replacement part# 6415325 of the failed pump. I did a google search on the two part numbers and it was interesting to see what came up. On the failed part# 6415325, it comes up with places like Ecklers and Advance Auto parts. On the new pump part# it comes up with places like Pace performance, Corvette Central, Jegs, and GM parts center. The new pump looks identical to my old pump which was removed by the repair shop during the engine rebuild. The failed pump looks different on the bottom and the locations of the inlet and outlet are different and in my opinion the spring is of a different gauge material.

[Richard D.]

Re: 1965 327-300 loss of power.

After draining the oil and replacing the filter, I placed a magnet in the drain oil. As you can see in the picture there were some pieces of the spring in the oil. I replaced the drain plug with a magnetic drain plug. Does anyone have any additional thoughts for what I should do before trying to start the car? Should I drain the new oil again and check it for any residual pieces?100_0398.jpg

[Gordon W.]

Re: 1965 327-300 loss of power.

I don't want to be an alarmist but that may or may not be the missing spring.

That could be the result of the spring floating around or it could be wear from god knows what else.

[Richard D.]

Re: 1965 327-300 loss of power.

I have the majority of the spring which was trapped in the fuel pump and I also found 2 curls behind the mounting plate but, I agree, who knows what else. Any thoughts on the 2 replacement part numbers(AC Delco).

[Gordon W.]

Re: 1965 327-300 loss of power.

Ah, okay I missed the part about finding the majority of the spring. I honestly wouldn't think it'd work itself into the engine anyways with the pushrod in place.

Regarding the fuel pump, there's a member here who has collected fuel pumps for 30 years and might be able to answer any questions you have on the differences. Search for David Liukkonen (3775)


Here's a thread where he discusses his collection:
https://www.forums.ncrs.org/showthre...feit-detection

[Richard D.]

Re: 1965 327-300 loss of power.

Looking at the fuel pump push rod it appears to show a discoloration at the spot where the bolt used to hold the push rod up against the cam for the pump installation may have been left in the block instead of using a shorter bolt. The bolt is 1 inch in length with some slight wear at the tip. I am going to replace it with a 1/2 inch bolt after the pump installation. I am waiting for a new push rod. I think the corvette restoration shop left the wrong bolt in the block. Is a 1/2 inch bolt correct? The second photo
illustrates the point on the shaft where the bolt hole is located by the orange paint. The third picture shows a slight indentation the cam side of the push rod. 100_0401.jpg100_0402.jpg100_0403.jpg

[Richard D.]

Re: 1965 327-300 loss of power.

Installed the replacement fuel pump and started the car. It appears to be running OK except for a slight stumble now and then when I step on the accelerator. I suppose it could just be the older gas in the tank since the car has been sitting in the garage for several weeks.

[Gordon W.]

Re: 1965 327-300 loss of power.

Good to hear it! Did you take it on a good length drive? Get 'er out there and run it through the gears.

[Richard D.]

Re: 1965 327-300 loss of power.

I added a few seconds of my engine running on youtube at

[Clem Z.]

Re: 1965 327-300 loss of power.

when you are having problems with engines not running right check the plugs,white plugs means lack of fuel problem and dark plugs means there is a ignition problem.

[John H.]

Re: 1965 327-300 loss of power.

I added a few seconds of my engine running on youtube at

Seems like a lot of valvetrain noise for hydraulic lifters..