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489" chevelle Gotta love a tunnel-ram BBC
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<blockquote data-quote="swampratt" data-source="post: 3076554" data-attributes="member: 15054"><p>Yep 3310 was the vacuum 750 carb and 4779 was the double pumper 750.</p><p></p><p>Neither in stock form would pull hard on the top end compared to a slightly modified Q jet or a almost stock 750 AFB.</p><p>Buddy had one built and I looked at it a 4779 double pumper the air horn was milled and very thin throttle shafts and small screws and it flower 890 CFM on a bench.. venturies were not enlarged.</p><p></p><p>I though I can do that..So i dug the 3310 out of mothballs and began massaging it with the die grinder.</p><p>When it was done it pulled HARD on the big end.</p><p>5500-7600 rpm it finally felt as good as the other carbs. And no loss of low end at all.</p><p></p><p>My 4779 main body looks like one of the new proform main bodies all rounded and smooth entry into the venturies including the front venturies that would just be squared off by the choke tower.</p><p>Gotta love JB weld.</p><p></p><p>On my 57 chevy I tested the RPM intake square bore and used my tweaked 4779 and tweaked Q jet ..only 10 HP difference winner 4779 Holley.</p><p>Now when I ran a ported Q jet intake ..All plenum dividers removed it was making 10HP less than the RPM intake but winner was the Q jet on that intake Holley down by 10.</p><p>Funny how that works.</p><p>Porting the plenum gained 20HP over stock.</p><p>This was tested at Abel racing on MoBoost wheel dyno.</p><p></p><p>I like carbs.</p><p>I tested the Qjet a couple Holleys and Motorcraft 2 barrels and a few AFB and edelbrock carbs on my 302 Ford.</p><p>After tuning they all ran the same and all got within 1/2 MPG.</p><p>So just kept the big motorcraft 2V.</p><p>That was a turd 302 with Keith black flat tops and 260H cam Ported smogger heads and ported 2V intake and Ported exhaust manifolds.</p><p>6000 lb Ford E150 18.1 ET in the 1/4 mile Think that is slow.</p><p>Beat my friends tweaked 91 Z71 350".. sad day for him.. </p><p></p><p>Fun stuff.</p></blockquote><p></p>
[QUOTE="swampratt, post: 3076554, member: 15054"] Yep 3310 was the vacuum 750 carb and 4779 was the double pumper 750. Neither in stock form would pull hard on the top end compared to a slightly modified Q jet or a almost stock 750 AFB. Buddy had one built and I looked at it a 4779 double pumper the air horn was milled and very thin throttle shafts and small screws and it flower 890 CFM on a bench.. venturies were not enlarged. I though I can do that..So i dug the 3310 out of mothballs and began massaging it with the die grinder. When it was done it pulled HARD on the big end. 5500-7600 rpm it finally felt as good as the other carbs. And no loss of low end at all. My 4779 main body looks like one of the new proform main bodies all rounded and smooth entry into the venturies including the front venturies that would just be squared off by the choke tower. Gotta love JB weld. On my 57 chevy I tested the RPM intake square bore and used my tweaked 4779 and tweaked Q jet ..only 10 HP difference winner 4779 Holley. Now when I ran a ported Q jet intake ..All plenum dividers removed it was making 10HP less than the RPM intake but winner was the Q jet on that intake Holley down by 10. Funny how that works. Porting the plenum gained 20HP over stock. This was tested at Abel racing on MoBoost wheel dyno. I like carbs. I tested the Qjet a couple Holleys and Motorcraft 2 barrels and a few AFB and edelbrock carbs on my 302 Ford. After tuning they all ran the same and all got within 1/2 MPG. So just kept the big motorcraft 2V. That was a turd 302 with Keith black flat tops and 260H cam Ported smogger heads and ported 2V intake and Ported exhaust manifolds. 6000 lb Ford E150 18.1 ET in the 1/4 mile Think that is slow. Beat my friends tweaked 91 Z71 350".. sad day for him.. Fun stuff. [/QUOTE]
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