Issues with bogging and suspected fuel pump output...

[Oystercopy]

Hey guys.. several years ago, I upgraded the cam with a Comp Cam kit, for slightly better performance on the 440. I believe the lift was .477, so not super radical. However, since adding the cam, I've had a runnability problem, where the engine will not rev above about 3000rpm and bogs on acceleration. A couple of years ago, I also added a new Holley Fuel Pump, since the OEM one died on me, which did not change the bogging issue. So, at least I believe the carb is getting a good supply of fuel. Also replaced the carb with a brand new Edelbrock 750 and only ever ran non-Ethanol gas in the car. So, my question is, did I need to possibly add a higher output pump to the engine when I upgraded the cam? The bogging seems like its not getting enough fuel? If I get a fuel gauge and test it, my understanding is that it should have about 5-6psi in pressure. Lets assume that's the case, is that enough for a cammed engine and could it be I'm simply not getting enough fuel to the carb? Any help greatly appreciated!
OC

 

[Steve340]

Do the test first. I understand the Edelbrock carb will operate no problems with 5-6 psi under driving conditions.
Given your 3000 rpm issue you need to mount the gauge where you can see it and go for a drive.
If the fuel pressure is maintained your problem is not fuel supply.

 

[Oystercopy]

Thanks Steve.. I'll give that a shot!
OC

 

[Ricks72Chlgr440]

Hey guys.. several years ago, I upgraded the cam with a Comp Cam kit, for slightly better performance on the 440. I believe the lift was .477, so not super radical. However, since adding the cam, I've had a runnability problem, where the engine will not rev above about 3000rpm and bogs on acceleration. A couple of years ago, I also added a new Holley Fuel Pump, since the OEM one died on me, which did not change the bogging issue. So, at least I believe the carb is getting a good supply of fuel. Also replaced the carb with a brand new Edelbrock 750 and only ever ran non-Ethanol gas in the car. So, my question is, did I need to possibly add a higher output pump to the engine when I upgraded the cam? The bogging seems like its not getting enough fuel? If I get a fuel gauge and test it, my understanding is that it should have about 5-6psi in pressure. Lets assume that's the case, is that enough for a cammed engine and could it be I'm simply not getting enough fuel to the carb? Any help greatly appreciated!
OC

You had the problem begin after changing the cam. Did you degree the cam or stick it in "dot to dot"? If the latter you'd be surprised at how off the marks on the gears are. I had a guy build my 440 and it ran like a dog. Ended up going to a different block using the same cam & heads... but the machine shop degreed the cam. He said the gears installed at "0" were quite retarded according to the cam card so he advanced the cam 6* as I recall. Day and night difference. Don't always blame the fuel system for runability issues until all other areas have been examined.