kendog_85_305

would a edelbrock 600 pro series carb with a holley high rise dual plane intake work fine with the stock fuel pump....and would gas mileage really be a big factor as long as my foot wasnt to heavy?

TOXIC-Z

I'd say it'd probably be alright but I don't remember what stock is for your car so you might want to wait until one of the moderators responds. They'll know more about it than me.

RB83L69

Well, I used a stock fuel pump with a 400 and a 800 CFM Holley, and it worked fine; so I'd say you're probably OK.

It would be a good idea to get one of the lightweight fuel pump drive rods though, such as from Moroso. That's what I used. Since the pump's suction stroke is driven by the cam eccentric and the pressure stroke is driven by the pump's return spring, and the return spring has to push that massive rod back up as well as move the fuel, I'm sure that lightening the load has got to help.

Barry85Iroc

I had a stock fuel pump and a Strret Avenger 770. Because of the built-in return line in the pump, it didn't develop pressure for sh*t.
(2-5 PSI depending at idle. At high RPM, the pressure would NEVER get above 5 PSI, which is not enough.) With an after-market pump and the proper regulator(to allow for a return line), With the stock pump, my front bowl level was very low. Now the carb sees a consistent, unwavering 6.5 PSI, and the car ran better. Just relaying my experience. Look at the 3-line Mallory regulator. Cheapest one I found with a return line port.
I also installed the ARP lightened rod, just because the one I was using was out of the original motor with 150K on the clock. I figured it couldn't hurt. The after-market repair manual (Chilton's) says to block off the return line to check the pressure. Why? When you release it, your pressure goes away. The REAL, FACTORY book says nothing about that. The carb needs good pressure. The car will run, and MAYBE not starve for fuel. Do it right, and get the proper set-up, and make sure the carb is seeing CONSISTANT, UNWAVERING 6 PSI at least.

RB83L69

I was using the stock fuel pump with the stock return line on this car, and it was fine; just like carbed cars have been for all these years. I can't even begin to tell you how many cars I've owned, built, worked on, etc. over a period of decades, with a system like that, that worked fine.

There's nothing wrong with, or inadequate about, a stock V8 fuel system, for any carb that one might use on the street (obviously a 1050 Dominator on a Pro Stock motor might be a bit different!); as long as it's working right.

Barry85Iroc

Mine WORKED too, but....ah, what's the point. You're right and I'm wrong........:hail:
P.S. I've never built any motors in my life.....

cc 82Z-28

iTrader: (7)

I have a 355ci with the Holley 670cfm carb and I'm running a replacement fuel pump that has more pressure but still has the return line port. I bought the thing from JC Whitney and it's been on the car 10years. I did have to put a regulator on it to keep the pressure even. It's never starved for fuel yet and I've run this motor to 6500rpm.

Barry85Iroc

A JC Whitney pump WITH a return line? That holds pressure? That's amazing. You must have the Street Avenger 670. I've got the 770, and the replacement stock pump from O'Reilly's just wasn't cuttin it. My front bowl was running very low at idle. The car never felt like it was stumbling, but at times I'm sure it was leaning out. I've already spent the money on another pump, or I'd of bought that one, cause I'm sure it was reasonbly priced (cheaper than the one I bought)

cc 82Z-28

iTrader: (7)

Oh yea, it was less than a 20.00 bill back when I bought it. I do have the 670 and it's been a great carb with very little adjustment to it. As I said, the motor runs strong all the way through 6500rpm with no bog or hesitation what's so ever. I'm not sure what the part number was or the brand of pump it is, but it does work fine. I had a friend who fine tuned the car for me last year, and one of my biggest problems was a high speed miss, turns out that the motor didn't like the vacumn advance hooked up at all. It's a brand new distributer and he said that car runs best without it. I have 34 degrees total timing with 16 degrees intial and the car starts and runs great. I got a shift lite to on it this spring to help keep me from over reving the motor. I can see me dropping the bottom out it if I over rev it one too many times and the wife wouldn't be too happy about that.