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Old 10-15-2004, 07:27 PM
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What carb. for my 383?

The 383 is getting rebuilt and I would like your suggestions as for wich carburator would suit it best. My intended use is strickly street but ,if possible, I'd like a carb. that would not underpower a motor that has high power potential...Since I had on that motor before a 600 CFM edelbrock-1405- I am tempted to reuse it but fear that it might be very power limiting...what you think?

here are the specs. of the rebuild:

SRP forged pistons,400 cast machined crank-tuffrited-,X-rods all new ARP fastenings, Weiand 8004 dual plane manifold,Brodix 8 alum.street heads-approx. 185 ccs runners,milled so the chambers are now 65 ccs, volumetric ratio as calculated by the shop is to be 10.5, Lunati 01004 hydraulic flat tappet cam advertised duration of 287 int. 304 exh.,220-231 at 50,110 lobe sep.,lift of 468-480,Lunati high revs. hydraulic lifters.

Msd ignition system and 1 and three quarters custom headers.

The car that motor is fitted in is only 2500-2600 pounds. The transmission is a doug nash 5 speed (that has a direct drive fifth gear) and the diff. ratio is now 3.08. The first gear on that transmission was meant to move heavy cars with its 3.10 ratio so the 3.08 final is O.K.

The cam is a 2000-6400 RPM power effective ,as advertised, and I guess the build-up could rev. that high without any risks but I don't intend to use this very frequently altough I'd like to know its there if I want it!

I like Edelbrock's ease of tuning and maintenance (car stays shutt 6 months a year cause of winters...)but I think 600 cfm will shut a lot of power from that motor..what you think and suggest?

thanks, Ron.

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Old 10-15-2004, 07:38 PM
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I just switched mine from the 600 you mentioned to a 750 3310S holley 4160 series carb. Needs some tuning, but overall, a better quality carb that privides much better throttle response.

K
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Old 10-15-2004, 08:08 PM
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ditto. Car Craft used a 750 carb on their 383 project to get 400-ish hp. They did have to get it fune tuned with different jets.
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Old 10-15-2004, 08:21 PM
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The 3310 is a nice street carb. If you go with the fuel block conversion and quick change vacuum canister you can get it dialed in to be super responsive and have a flawless secondary transition.

Chris
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Old 10-15-2004, 09:03 PM
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I'd agree with the 3310-2 and up. The 3310-1 had downleg boosters. The downleg boosters really kill throttle response and bottom end, in exchange for not a whole lot more top end.

I wouldn't recommend a 4779, 750 DP. They have the downlegs boosters also. It is unfortunate that Holley didn't make their 4776 to 4781 series with straight or annular boosters. The 4778, 700 is the last of the good boosters. If you get a 4778-2 or 4778-1, they came with the small skirt truck boosters. Those carbs have killer throttle response.

There is also the 4609, 730 CFM vacuum secondary. It is a Cobra Jet replacement carb that is still available from Holley. On Ebay you can find them for around $125. They came with the big skirted truck boosters in the primaries and downlegs in the secondaries. That way you get killer throttle response and retain the top end.

Of course, you could just get a boring old Edelbrock 750.

Either way the 600 is a restriction.
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Old 10-15-2004, 09:43 PM
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I've been using a 3310 on my 383 that I had built to look like a 2818 (single inlet, heat choke, etc). I've had good luck with it. (In case you're wondering, the engine is disguised as a 327.)

I tried a 3310 on my 406 and swapped it out for an Edelbrock 750.
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Old 10-15-2004, 10:43 PM
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Here is one of the 4609 carbs I was talking about. This one needs to be cleaned up, new gaskets, and maybe throttle shaft bushings. Never mind what the seller says, it isn't rare.

Of course Holley has new ones.

http://cgi.ebay.com/ebaymotors/ws/eB...sPageName=WDVW
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Old 10-16-2004, 08:38 AM
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If you intend to see the 6400 RPMs the 600 is way small.
Barry Grant has a 725 CFM carb that would work great.
Other wise, 750 should be fine. John
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