In the next few months I would like to run 2x4's on my sbc. I was planning on running an edelbrock low rise manifold with 2 carter carbs. My motor is a 69 350 with 255hp factory. It has a set of longtube headers and will have the summit 1103 cam. I know that some 56 chevies came with a 283 245hp and 2x4's. I know some of the vettes came with 2x4's on 283's. My engine has more hp factory than those and it will also have a better cam and headers. I am wondering if I will be able to run two carters without it flooding bad. I was also wondering what size carter carbs came on the early vettes that ran 2x4's. Any help or advice is appreciated
I have two 500 AFB's on a manifold like your's on a 327 with fuelly heads and a reasonable cam, and it purrs like a kitten, good luck. Cheers Dago.
Late Carters - the ones that are twins to Edelbrocks? You shouldn't have flooding problems if the carbs are in good shape. Running rich? Another story entirely. Keep in mind late Carters - and Edelbrocks and probably others - have springs on the metering rods. The springs push the metering rods up richening the mixture. Engine vacuum pulls them down. When the usual metering rod spring - chosen for a mild factory cam - is used with a hot cam it will allow the metering rods to open early and create a rich condition at idle and low springs. This because the hot cam has lower vacuum at idle. Generally: Stock or mild cams idle at about 18"-19" vacuum. Hot cams - advertised duration around 280* or so - idle at 10"-12" vaccum. This at sea level. You'll drop about 1" vacuum for every 1000' of altitude gain. All you need is a five pack of metering rod springs. The pink spring is a good choice. The springs are ID'd by color. Once you run one, the color will be washed off so store the spring in an old pill bottle or baggy and use a Sharpie to label what spring is inside. As noted, this info for the late Carters. Some guys like progressive linkag and some like straight. Trouble with many progressive linkage setups is they're a piece of crap and can be dangerous. Edelbrock makes an excellent progressive and I wouldn't be afraid to use it. I run straight linkage, no problems and even with a big cam the 462" Buick with dual 500 CFM Carters idles at 600 RPM and has a quick throttle response. ~~~~~~~~~~~~~~~~~ Do you know what size your carbs are? Small ones would be nice, but larger ones - within reason -work ok due to the air valve secondary system limits air flow to what the engine wants. A small example would be my pal's 302 mildly built Ford engine in his bulbous - but good looking - 46 Ford sedan. It runs a 600 Edelbrock. A few weeks back a float drowned so we stuck on my spare 750 Carter - a 20 minute job - the engine fired up and ran fine with good throttle response. Regardless, if you're making a carb choice a pair of 500's would be ideal in my book....
I've got a SB 400 with a low profile Weiand intake, two 500 Edelbrocks. The cam is a Comp Cams hi-torque 4X4 cam. I think about 218I- 224E dur, 498I- 502E lift with Rhodes lifters. It took a little bit of tuning but I get 21 MPG on the road. I set it up so it runs as lean as possible on the primary carb and richer for the secondary.
The factory 265,s and 283,s ran two carter WCFB 490 cfm carbs with progressive linkage.If you properly tune them any carbs will work. Theywill only flow as much cfm as the throttle plate is open.What im saying is two 490 cfm carbs at 1/2 throttle flows about the same as one at full throttle.Get your metering rods, jets or powervalves correct it will work. Mabey you will need to only run 3/4 or something less than fully wide open but it will work ok.When i ran a garage and rebuilt or overhauled a engine i would adjust the carb linkage to only give 2/3 throttle . Gave the engine job a better chance, never had a come back. and only one guy noticed the difference. OldWolf
i just found a 2x4 intake. the name on the intake is creitz. anyone know anything about this intake. thanks
Yep I've got one with 2 AFBs, Spoke with Bob Creitz at the HRR this year, He said the majority of these were built in 1958-59. Ive not tried it on an engine yet , but plan to as soon as I get some kits for the carbs.
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