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dobie6982 11-13-2013 12:03 PM

New Carb for Pontiac 400
 
I am currently looking at updating my fuel system in a 1968 Pontiac Firebird. It currently has a Pontiac 400 with Edelbrock heads, ported and built by Jim Butler in TN, with an RPM intake. It has a hydraulic roller cam with 230 I - 236 E duration at .50 lift, and .510 Intake lift and .521 Exhaust lift. I currently have a HEI distributer, but will be upgrading to an MSD set-up soon. I have Hooker Competition headers with a 2 1/2 in exhaust. This is backed up by a Muncie M-20 wide ratio trans and currently 3.73 gear. I may be going to a 3.08 in the future. I am also planning on running a 1/2 in line with an electric pump and regulator with a return line. I am looking for everyday drive-ability plus throttle response. Not really loyal to any brand.

techinspector1 11-13-2013 12:36 PM

Quote:

Originally Posted by dobie6982 (Post 1909258)
I may be going to a 3.08 in the future.

Seems like a bad idea to me, with the 230/236 cam. If you're thinkin' fuel mileage, park the hot rod and buy a 4-cylinder Honda.

dobie6982 11-13-2013 12:55 PM

Really not thinking about fuel mileage, just not wanting 3500 RPM at 65MPH. That's not a solid yet as I am looking at getting a TKO to address that issue. Right now I am just looking for advice on getting my fuel system set up.

techinspector1 11-13-2013 01:02 PM

Quote:

Originally Posted by dobie6982 (Post 1909354)
just not wanting 3500 RPM at 65MPH.

Well then slow down. What's the big hurry anyway?

dobie6982 11-13-2013 01:13 PM

I have to drive on I-65 near Montgomery. Anything under 65 MPH and you will probably die a horrible fiery death, like when your wife meets your girlfriend sorta thing. Plus I like to take my little boy on road trips and to car shows that just are not as close as they used to be. I probably will just go to an overdrive on it. I am just not there yet.

P.S. I used to have a 4 cyl Honda Civic. Traded it to the old man for Pontiac Grand Prix. I am still not sure who won in that trade.

P.S.S. I would rather buy gas and have fun.

LATECH 11-13-2013 02:28 PM

Check these out.Looks good.
Carburetors SS-Series

There is a complete tech section on the website so you can tune it.

F-BIRD'88 11-14-2013 08:24 AM

If the cruise rpm is too high install rear tires that are 2" taller diameter.

Why do you think you need such a big fuel line?

dobie6982 11-14-2013 10:27 AM

I do not want to suffer from fuel starvation. Do you think the stock line will be big enough?

F-BIRD'88 11-14-2013 10:49 AM

Quote:

Originally Posted by dobie6982 (Post 1911474)
I do not want to suffer from fuel starvation. Do you think the stock line will be big enough?

A 3/8" fuel line that does not have any kinks in it will feed a engine well over 500 horsepower
A Edelbrock or Carter engine mounted mechanical fuel pump 110GPH rated and a 3/8" fuel line is all you need. Add to that a Carter P4070 electric pusher at the tank to ensure/
prevent vapour lock under the harshest hot soak condition and you have a bullet proof street/strip fuel system
Be sure the fuel pick up tube in the tank is a true 3/8" and goes to the deepest part of the tank and you are good to go.
5 to 7psi fuel pressure is all you need. More is not better. A 1/2" fuel line will not add anything to this.

Keep the fuel line routed away from the headers and other heat spots and you are all good.

Keep it simple. Use a 750cfm to a 850cfm carb.


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