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390 CFM carb starving on uphill? |
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Thikstik
AMC Addicted Joined: Mar/20/2008 Location: Alabama Status: Offline Points: 1327 |
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also check for loose base nuts , metering plate bolts
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75 gremlin x, jeep 4.0 headed 258,
264H Cliff cam, intake,header. 390 holley. I want a 282 VAM motor! AC/PS/PDB. 72 AMX , 304 2bbl, 3speed, now disks...probably will sell, want an automatic /AC. |
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REBEL_BOB
AMC Nut Joined: Jul/14/2007 Location: United States Status: Offline Points: 453 |
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I ran holley carbs in the early 70s and found the float level critical and the bowl vents had to be extended so fuel would not splash down the throttle and cause a stumble when climbing hills good luck
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THANKS FROM REBEL_BOB
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Thikstik
AMC Addicted Joined: Mar/20/2008 Location: Alabama Status: Offline Points: 1327 |
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Any luck? Did you give up on it?
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75 gremlin x, jeep 4.0 headed 258,
264H Cliff cam, intake,header. 390 holley. I want a 282 VAM motor! AC/PS/PDB. 72 AMX , 304 2bbl, 3speed, now disks...probably will sell, want an automatic /AC. |
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tomj
AMC Addicted Joined: Jan/27/2010 Location: earth Status: Offline Points: 7522 |
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the main jets are low in the bowl; the fuel level (float level) would have to be crazy low to uncover them on a hill. possible but I think unlikely.
"up a hill" means foot in the throttle which means lower vacuum which means vacuum advance drops. if you set base spark timing (distributor position) with the vacuum hose on, it would exactly create your symptom. as soon as you press the throttle under load, vacuum advance will drop (might even go positive) and you'd get a huge bog. a simple trick for setting/checking spark timing is to simply pull the vacuum hose off the distributor and plug it. then set spark timing and drive it around. vacuum advance is only/mainly for improved light-throttle light load cruise mileage. you will do no harm without vacuum advance, and it will make all the interactions with load and vacuum disappear. |
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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