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Author Topic: What size carburetor on a 428?  (Read 6881 times)
WildWillyWalker
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« on: August 21, 2010, 08:33:41 pm »

My friend at work has a '69 Mach 1 which he's getting a motor built for.  It's a stockish 428.  I don't know much about it but here's an idea; bored .030 over, ported stock (?) intake and ported stock heads with bigger valves, stock exhaust manifolds and I'm not sure about the rest of the exhaust.  The guy building his motor told him to get a 750... and I forget what company it's from....  Wouldn't that be small though?  I just read an article in MM & FF where they put a 750 on a 306.  I know nothing about carburetors but I figure that's the main point here?  I'm curious what you guys think should be put on it with the vague information I gave.  Thanks.
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« Reply #1 on: August 21, 2010, 08:37:51 pm »

....toploader or C6 and what rear gear?
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71 Comet, 289,351w heads,RR's,12.5 TRWs,ported torker/750DP, Liberty Top Loader (2.78), 9"/6.00s, tubbed,ladder bars,11.9xs@110 ..bla,bla,bla
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Outlaw Bill
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« Reply #2 on: August 21, 2010, 08:42:28 pm »

I would say 750-950. Does he need a choke?.
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WildWillyWalker
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« Reply #3 on: August 21, 2010, 08:44:22 pm »

Uhh, it's a four speed.  Rearend gear?...  He isn't sure what to choose but I think everyone's making him lean toward 355s.  Anyone know if that's a good choice?  Honestly no clue about the choke. lol  I'm too noobie for this part of the forum.
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« Reply #4 on: August 21, 2010, 08:56:22 pm »

   If his guy suggested Patrick (PRO-SYSTEMS) his 750's should suffice ,or if not he'll set you up with the correct size you need.    Good Luck!
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71 Comet, 289,351w heads,RR's,12.5 TRWs,ported torker/750DP, Liberty Top Loader (2.78), 9"/6.00s, tubbed,ladder bars,11.9xs@110 ..bla,bla,bla
84Cougar,88HO,Eddy RPM/700DP, 1.7RRs, shorty's, 8.8/4.10s,T-5/Hurst Pro Billet, K/C clutch...bla,bla,bla

Never shoot your mouth off unless your brain is loaded.   If you're not laughing...you're not living!
WildWillyWalker
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« Reply #5 on: August 21, 2010, 09:10:02 pm »

I'm currently talking to my other buddy and it's a Quickfuel.
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« Reply #6 on: March 03, 2012, 05:04:08 pm »

Original/factory is a 735 cfm.
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frdnut
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« Reply #7 on: March 03, 2012, 06:29:36 pm »

Do you know if its a cobra jet or not?..The CJ heads already have bigger valves than a non CJ motor that is why I am curious....The stock 735cfm holley carb seems to work pretty well on them so I would stick close to that..Especially if he is running stock exhaust manifolds..
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« Reply #8 on: March 03, 2012, 08:31:12 pm »

This thread was last posted almost a year ago ...
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