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What carb would you run?
I'm building an engine now, here are specs:
482" sideoiler KC Stage II Edelbrock heads KC solid roller 11:1 CR Performer RPM intake MSD ignition Aluminum flywheel Tremec TKO 600 RR Car is a Contemporary - weighs about 2300 lbs. HP street driving, occasional road racing. There's not enough $ left for fuel injection. I really wanted Webers but there's not enough $ left for them either! :CRY::LOL: I have a chance to buy a very clean Barry Grant 825 race demon at a very good price. Is that a good carb for this engine? All in all what would you guys recommend? I only have one prerequisite - I know guys will argue with me but it's the only point I'm not flexible on - I don't like vacuum secondary carbs with manual transmission cars and I won't run one. Anything else I'm all ears. What do you guys think? Thanks. |
I would run the Holley 950 HP. You might think it's too big, and I'm not a carb expert, but the car runs great.
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dual quads in the budget?
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I'd run four weber's if I could afford it.
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You may want to run it thru one of the numerous calculators out there. Do a search on 'Carburetor CFM Calculator'. I pulled up one, set up your 482ci, 6700rpm, pulled up a 935cfm requirement at 100%ve. Which is almost exactly the same as mine, 430ci, 7500rpm.
Great to see after all the work making room for an FE, you are going to stick a KC sideoiler in it. I would recommend a port matched Edelbrock Victor w/ the 4bbl. Polish up a turkey pan and stick under when you want the looks. What roller are you going with? |
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I'm actually in the process of trying to get in touch with Keith for the final cam selection. I haven't bought it yet but I have to get it on the way soon. I'm always up in the air during the week for work, and I guess Keith is closed for business weekends when I'm off, so it's very hard to hook up by phone. I'll get him one day next week and get the ball rolling. I was wondering what carb to use, so I was hoping in the meantime you guys might have some input. |
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Have you considered the Mass-flo? Kieth is a dealer.
Since the $4k kit includes the intake, dist it's not much more. Not to mention the benefit of self calibrating and better accuracy since it's not MAP based. Considering the cost of mine I felt it was cheap insurance to keep it running as long as possible. Today's 200k+ mile engine life and higher HP attest to how good a modern production FI system is. It's only about $2500 more and with gas at $4 it'll pay for itself rather quickly. |
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Holley 04777C with a Moroso 1:1 linkage kit installed.
Bill S. |
I'm running a ProForm 950 (Holley 950 HP clone w/billet base/metering plates and better adjustability, IMO) on my KC Pond 482. It runs great and the 4 corner idle provides great idle A/F adjustability.
Dave |
Holley 750 HP...runs good right out of the box. Obviously you might have to do a jet change depending on where you live.
http://www.holley.com/0-80528-1.asp |
I just had my 331 stroker tuned on a chassis dyno by Mustang Specialties in Pompano Beach, FL. I have s Quick Fuel Tech carb on my Keith Craft built motor. The tuner at Mustang Specialties said they ALMOST invariably change carbs on a lot of the cars that come into them with after market carburators - and they recommend Pro Systems carbs. Said in his opinion they are the most reliable. If I ever decide to change I will certainly look into Pro Systems Carbs. RD
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As a rule of thumb, you can take the cubic inches of the engine times the maximum rpm and divide it by 3456 to give you an approx cfm.
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Doug,
There is a nice Barry Grant for sale on this site. Barry is a carb expert and has a great web site. His 650 might flow better than a 750 Holley based upon the air flow character as that dictates feed. Flow is the key to carburation efficiency. I do know that most cars are over the top with carburation. I would talk with and expert like Barry Grant, KC, and maybe your engine builder. I would think that a 2008 racing carb would allow maximum flow with better results even on the street. |
The answer to your question is
YES! You MAY have to go bigger but it's a good place to start, especially if it is cheap! |
I built my car for the street. I'm running a 750 Demon on my 427 S/O, and love it. I used a O2 sensor to dial it in.
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I think I would get Keiths advice on the carb. if he is supplying the heads and cam. This combo. is a little different from the 390 you were talking about a few months ago, sounds great . 11-1 c.r. a little high though, no?
One thing you should do is have the engine builder install the pilot bushing/bearing to make sure it fits correctly. There was some talk here about the hole in some stroker cranks being too large. |
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I'm trying to get in touch with Keith now re:the carb, I guess I'll have to wait until during the week and hope I'm on the ground somewhere long enough to get some time on the phone with him. |
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