1962 300 hp driveability issue

[David R.]

I just replaced an aftermarket Edelbrock 4-barrel with the correct Carter AFB on my '62 300hp 4-speed. It starts and runs well, with the exception of bogging down quite a bit at part-throttle. I seem to have everything adjusted per the manuals, but unless I get on the gas pretty aggressively when, say, accelerating away from a red light - it really bogs down quite a bit. What am I overlooking? Thanks in advance for any and all suggestions and help.

[Joe L.]

Re: 1962 300 hp driveability issue

I just replaced an aftermarket Edelbrock 4-barrel with the correct Carter AFB on my '62 300hp 4-speed. It starts and runs well, with the exception of bogging down quite a bit at part-throttle. I seem to have everything adjusted per the manuals, but unless I get on the gas pretty aggressively when, say, accelerating away from a red light - it really bogs down quite a bit. What am I overlooking? Thanks in advance for any and all suggestions and help.

David-------


Did it not have this problem when the Edelbrock carb was installed? If it didn't, then that obviously means there is a problem with the original carb you installed. That would not be surprising as lots of "rebuilt" carbs are not right for one reason or another. As I've said many times before, nothing makes a car run like a NEW carburetor. NOTHING!

[Duke W.]

Re: 1962 300 hp driveability issue

I just replaced an aftermarket Edelbrock 4-barrel with the correct Carter AFB.

That would be a 3310S, but like Joe said even if it appears to be "correct" from the outside, the internal parts may not be correct for this model. A lot of "restored" carbs are assembled from basket of of parts that came from different models.

The first thing you should do is talk to whoever you bought the it from, and you may want to disassemble it and check part numbers for conformity with specifications.

If the engine "bogs" when starting from a dead stop, it could indicate a problem with the accelerator pump. How about other driving conditions. If you're cruising along and need to accelerate moderately does it respond properly to light to medium throttle increases.

How about steady speed? Does it surge or run smoothly at constant throttle?

Duke

[Bob R.]

Re: 1962 300 hp driveability issue

Duke is right on with the internals on these carburetors. Unless you know for certain the carburetor is set up as original that would be the place to check. I replaced the metering rods and jets on my 3461 with as close to original specs as I could get and it made a big improvement.

[David R.]

Re: 1962 300 hp driveability issue

I appreciate the input. I got the carburetor from a quality carb rebuilder who has done good work for local Corvette owners. I have made it a point to ask him for his advice on the driveability issue, I'll let you know what he says. I did have a slight stumbling every once in a while with the Edelbrock, but nothing like I'm experiencing now. And again, if I drive it a bit more aggressively it's fine. No surging at constant speed, runs smoothly and idles well. Sounds like I need to look closer at the internals. Thanks again, guys.

[John M.]

Re: 1962 300 hp driveability issue

That would be a 3310S,
Duke

I thought the 3310S Carter AFB was exclusively used for the 1962 300HP Powerglide option, not the 4-speed.

Save the Wave .............. JGM

[Duke W.]

Re: 1962 300 hp driveability issue

Correct! ...don't know why I quoted the PG carb. The correct 300HP/manual carb is 3269S... also used on 340 HP engines. which were manual trans only.

Duke

[David R.]

Re: 1962 300 hp driveability issue

. . . and the 3269S is the one I have. I'm working with the rebuilder, we're going to look at the jets over the weekend.