Guest DarKnight Posted May 16, 2008 Share Posted May 16, 2008 hi guys. been a while since i was on last. im restoring my monte now and it should be done soon. but one of my problems is my Gen. VI big block has a problem with getting too much fuel. the plugs are always fouled out black like its getting too much gas. the engine came with a Eddy RPM intake, "R.V." cam of unknown specs,Crane gold series roller rockers, the stock peanut port heads and a Eddy 750 carb. it came this way from the guy i bought it from. i've been told the carb may be too much for this combo since the head ports are so small. opinions? should i switch to a smaller carb? can i downsize the jet size in the carb i have? thx for your time guys. i'll have pics of the resto job for you soon. justin Link to comment Share on other sites More sharing options...
Sam (Bones) Posted May 16, 2008 Share Posted May 16, 2008 lean that carb out some, 750 CFM should be fine for that engine, they have tuning kits for the Edelbrock carbs, if you have the book for the carb, READ IT!!! they are a relatively a simple carb to tune and work on Link to comment Share on other sites More sharing options...
Guest FATRAT Posted May 16, 2008 Share Posted May 16, 2008 pics Link to comment Share on other sites More sharing options...
680HPStroker Posted May 16, 2008 Share Posted May 16, 2008 CALL A CARB BUILDER!!!!!!!!!!!!!!! Link to comment Share on other sites More sharing options...
Heckeng Posted May 16, 2008 Share Posted May 16, 2008 lean that carb out some, 750 CFM should be fine for that engine, they have tuning kits for the Edelbrock carbs, if you have the book for the carb, READ IT!!! they are a relatively a simple carb to tune and work on That is great advice! I agree with it too. A 750 should work fine on that engine, you just need to learn how to tune it. Any carb, regardless of brand, can be tuned to run rich or lean, so just lear how to tune it and you'll be good to go! Link to comment Share on other sites More sharing options...
72 LS5 Posted May 17, 2008 Share Posted May 17, 2008 Justin - what's up? I gotta stop by the shop one day soon.... That engine really has the peanut ports and not the regular oval ports?? I am going to venture to say that the problem could be on the ignition side with weak spark. Are you running HEI? If so, remember NOT to use the hot lead wire that was for the points coil - its a resister wire and does not have the voltage you need for HEI. What about plug wires? I think MSD has the least resistance of any wire. Good luck! Mike Link to comment Share on other sites More sharing options...
wallaby Posted May 17, 2008 Share Posted May 17, 2008 There are screws on the carb that will adjust the idle mixture, but those aren't going to change the fuel ratio at part throttle or wide open settings...twisting the idle mixture screws isn't going to change the color of the tailpipes or plugs unless the engine spends its entire life idling. You are going to need to open up the carburetor and change the jets/ rods to change the fuel ratio. The other possibility is that your power valve might be sending a rich mixture because it has the wrong spring setting or is getting a low vacuum signal. It could even be something as simple as a high float level. It sounds as if you should get the carb numbers and buy a rebuild kit and sit down at the workbench with the carb and find out. Usually the idea is to change jets and rods as a pair when you make changes, but you can probably go 4 jet sizes either way before you need to change rods. I'd open the carb and see what jet you have in there now and order replacements 4 sizes smaller, and go from there. I wouldn't worry so much about the secondaries. Link to comment Share on other sites More sharing options...
Guest DarKnight Posted May 20, 2008 Share Posted May 20, 2008 Hey guys, thanks a lot for your input. they all sound like reasonable causes for this problem so i'll try them out. the carb was rebuilt several months ago with all new rods and jets ment for this size carb. i'll probably learn more about adjusting the mixture first. Mike, good to hear from you man. come on down the montes looking good. i do have an HEI system from Mallory with the high end coil and 10.4mm wires. but i did use the original power wire for supply. could this be a problem? thanks for the tip. i'll look into whether that wire is causing trouble. thanks again to all of you that responded. Link to comment Share on other sites More sharing options...
wallaby Posted May 20, 2008 Share Posted May 20, 2008 I did the same thing when I first installed my HEI, and I can tell you that there is a noticeable difference when you get real voltage to that HEI. That single wire should help a lot. The HEI system hates running at less than 12 volts. Link to comment Share on other sites More sharing options...
Guest DarKnight Posted May 20, 2008 Share Posted May 20, 2008 so what do i do to correct the wire issue? which wire should i use? Link to comment Share on other sites More sharing options...
72 LS5 Posted May 20, 2008 Share Posted May 20, 2008 Justin - there have been different posts to search about this. I did mine so long ago, I'm not sure which wire I spliced into under the dash. The original coil wire is a resister wire, and I used that for the first few years like you, but I changed it to a full 12 volt "keyed" power source years ago. You need to find a 12-volt source that is on with the key in both the Start position and Run position. Try to search this site for the specifics. This may help you get a more complete burn and less fouling. Mike Link to comment Share on other sites More sharing options...
Sam (Bones) Posted May 21, 2008 Share Posted May 21, 2008 if you follow the resistor wire back, you'll find where the resistor part starts, cut it off and splice in a new section of wire, or you can tap into the fuse block at the "IGN" terminal Link to comment Share on other sites More sharing options...
Guest FATRAT Posted May 21, 2008 Share Posted May 21, 2008 , or you can tap into the fuse block at the "IGN" terminal thats what i did.. used a.. i wanna say 10 gauge wire? Link to comment Share on other sites More sharing options...
FerrariTruck Posted May 21, 2008 Share Posted May 21, 2008 Or you can just go to the junkyard and remove the complete wire from a truck that had hei. That way you get everthing from connector to the pin terminal. follow the power wire to the bulkhead..once there remove the the center bolt that hold conector to fire wall. You might have to pry the bulk head connector due to the sealant goo they use to keep corrosion out. once there simple you will see how to disengage the pin and remove the old resistance wire. then just slide the correct hei wire...SO much simpler and cleaner this way.. Link to comment Share on other sites More sharing options...
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