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Old 06-23-2005, 08:24 PM   #1 (permalink)
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Running rich how do I fix.

I have a 69 Mustang with a 351 Windsor, world heads and an agressive cam. Running it is a new Holley 750 dbl pmpr. Recently I replaced the intake gasket and carb. Then the problem occurred with the old carb on it so I replaced the carb with the exact same model of carb I had before. Now my engine seems to be running richer ( it was before, also but not so much) and ocassionally it has a slight to med backfire in the exhaust. I tried messing with the timing by rotating the dist about a 1/4 inch clockwise and it fixed it some but it still does it ocassionally. Do I need to tune the new Holley? If so how? Is the carb too big? The old one was a little rich but ran fine before I replaced all the gaskets. Also I noticed during some inspections that my 351 W is set up for the 302 firing order. I tried putting it back to the 351W firing order but it sounded bad.....although I did not try to adgust timing also....(perhaps Ishould try this) Please any help appreciated....I am slowly losing my summer Also, I live in Clarion Pa 16214... If anyone knows a good engine and carb mechanic or shop in the local area I would appreciate a reference in case I can't fix this. Thanks Anthony. aegreco2002@yahoo.com
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Old 06-23-2005, 08:43 PM   #2 (permalink)
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Running rich how do I fix.

Could my timing chain be worn also? I adjust it and it's good for a short while then get's progressivly worse.
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Old 06-24-2005, 07:41 AM   #3 (permalink)
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Running rich how do I fix.

You didn't tell us your cam specs. Also, your 351w with a 302 firing order means someone put a 302 cam in it and it now needs that order. You can't change that unless you get a different cam.
Is the new carb. jetted the same way the old one was?
We need more info on your setup....heads, cam specs, gears, intake....

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351w(.060), ported & polished heads with 1.94/1.60 valves, 10.3 comp, stealth intake, 274XE cam, Holley 750 dp, Mallory dist., shorty headers, flowmasters, 4:10 gear, c-4 with 3700 stall converter, subframes, electric fan
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Old 06-24-2005, 09:46 AM   #4 (permalink)
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Running rich how do I fix.

I don't have muckh information and what info I have I don't understand. I have tried to research the heads and cam but I have been told there is no info available. i called the pre vious owner and this is what he told me. World heads, 202 intake, 160 exhaust. Can handlr 575 lift. Duration 512 512 230 230 Then tthere is something that says 80 magnum. I have the summit part number for the heads but they can
t research them any more.
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Old 06-24-2005, 09:53 AM   #5 (permalink)
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Running rich how do I fix.

Oh the carb is straight from summit I would be suprised to see them jetted the same. But like I said early I was getting these symptoms before I replaced the carb. Could I have a leaking intake gasket? When I put the intake and the old carb on it rand well. I then let it set for a couple months and it developed the small backfire and the timing went off a little. I don't understand it. My next plans are tto change the plugs..then the timing chain then I don't know replace intake gasket again. Could it be a small head leak? Does anyone know of a book where I can learn the proper way to rejet a Holley carb...I think that's coming soon.
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Old 06-24-2005, 09:54 AM   #6 (permalink)
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Running rich how do I fix.

I would contact Jesse at Bigs. He may suggest fixing yours or replacing it with one of his.
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