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BassBoat 
AMC Addicted 
Joined: Aug/29/2008 Status: Offline Points: 1718 |
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 Posted: Oct/13/2014 at 1:50pm |
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Does not sound bad to me. Does sound like a bigger than stock 304 cam. Any cam in a 304 is a big one, that and a low restriction exhaust are both going to require a little richer carb settings. If you have a bigger than stock cam you really need to recurve the distributor. More advance at low rpm will smooth out the rough idle. You could try just advancing the timing to see if it helps, but the idea of a recurve is to make a corresponding reduction in higher rpm advance so you have the right total advance, so don't drive it hard until you have the curve right.
BB
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Boris Badanov
AMC Addicted
Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
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Posted: Oct/13/2014 at 8:01pm |
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Agreed, it sounds like it needs more advance at idle.
Re-post here from another thread. With a performance cam you may need a lot more initial timing than stock.
Where the timing becomes a problem is some AMC application distributers will have 30+ degrees of mech advance built in. Set it for 18 degrees for a good stable idle and good responce and you might thave a bomb with 48+ degrees at high engine speeds. (not including vacuum advance). To run enough initial advance you have to modify the internal stops to limit the total advance. I will guggest, without vacuum advance figured in, never exceed 40 degrees total, and in most cases about 34 degrees total. Vacuum advance can safely over advance at light throttle settings to compensate for the low cylinder pressures due to high vacuum conditions. |
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Gremlin Dreams
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fastjeep
AMC Fan 
Joined: May/22/2011 Location: York PA Status: Offline Points: 23 |
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Posted: Oct/13/2014 at 8:36pm |
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Try carb spray cleaner to find vacuum leaks, spray a shot in carb to see if engine speeds up or loses rpms. After that spray cleaner around carb base gaskets ,intake edges and at vacuum lines if engine reacts the way when shot in carb throat, you found a vacuum leak. Been hearing that newer carb gaskets aren't cut like older gaskets and are leaving gaps at places. Seen a friend chase a leak on bbc that was causing a leak at rear of carb base. Good luck
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purple72Gremlin
AMC Addicted
Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16611 |
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Posted: Oct/13/2014 at 10:35pm |
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Power valve?
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FuzzFace2
AMC Addicted
Joined: Jul/05/2007 Location: Angier, N.C. Status: Offline Points: 10356 |
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Posted: Oct/14/2014 at 10:12am |
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To check for a vac leak I would remove all vac lines and plug them. Then using a rag cover the carb a little at a time to choke it off to see if that does anything. If so then you have a vac leak and use carb cleaner to pin point it.
If points check dewell and timing and set to spec. also check the springs as someone said. Maybe even tie them closed to make sure they are not the cause. If you find it is the carb and want to stay with the v2 you may want to look into a Holley 2300 @500 cfm as it will bolt right onto the stock intake and the stock air filter will work too. BTW I had a Holley v4 on my project that I could not get to idle right even after a rebuild. I bought a new/used carb off ebay that fixed the issue I was having. Good luck Dave ---- |
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TSM = Technical Service Manual
75 Gremlin X v8 for sale 70 Javelin 360/auto drag car 70 Javelin 360/T5 Street car |
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jayramb
AMC Nut
Joined: Aug/25/2009 Location: Bloomington, MN Status: Offline Points: 487 |
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Posted: Oct/14/2014 at 10:45pm |
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I have had vacuum leaks around the choke tube plate. I then used Permatex Right Stuff to seal it up. That was my surge problem/vacuum leak.
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Jayson Helenske
See my webiste! www.1967AMCRamblerRebel.weebly.com Current Cars: 1967 Rambler Rebel 770 290 V8 4-barrel and Paint - Marina Aqua. 1966 MARLIN 327 V8 4 barrel and Paint-Med. Cortez Aqua |
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JavelinYES
AMC Apprentice 
Joined: Jun/25/2009 Location: Never neverland Status: Offline Points: 150 |
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Posted: Oct/25/2014 at 7:51pm |
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Thanks everyone for the info and suggestions...
I'm pretty embarrassed to say it was just a dirty carb. We cleaned it ourselves but it didn't do anything. So we dropped it at my uncles and he did a little deeper clean and BAM...Fixed. In a way I'm glad all that happened or I wouldn't have found out the fuel pump arm was about to fly off and possibly hurt the engine. |
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Snotty
AMC Addicted
Joined: Mar/28/2014 Location: Chico, CA Status: Offline Points: 1247 |
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Posted: Oct/27/2014 at 12:05pm |
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It happens!
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Son's car: '73 Gremlin X, 401, T-10, Mopar 8.75 rear with 3.23 sure grip. My car: '70 Newport Convertible, 440 automatic
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JavelinYES
AMC Apprentice
Joined: Jun/25/2009 Location: Never neverland Status: Offline Points: 150 |
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Posted: Oct/31/2014 at 1:21pm |
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oops wrong thread..ol
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