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Re: Big 2 bbl vs sm 4 bbl
[Re: gts1]
#688483
05/04/10 07:55 PM
05/04/10 07:55 PM
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Joined: Aug 2006
Posts: 1,609 Southern Cal
Noblewk
top fuel
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top fuel
Joined: Aug 2006
Posts: 1,609
Southern Cal
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Finding a 4bbl manifold that has ports matching the 273 intake port will be a challenge. A 4bbl will provide better lowend torque, throttle response and better mileage. You would also have a port matching issue with the 500 cfm carb with the stock manifold. You would have to mill the ports for the butterflys to open.
600 double pumper is the way togo
66 Dart GT, 402 11.18:109 Best
63 1/2 Galaxie 500XL 406 4Speed 13.20:103 Best
2000 Ram
2005 Durango Hemi.
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Re: Big 2 bbl vs sm 4 bbl
[Re: Mopar_Country]
#688485
05/04/10 09:20 PM
05/04/10 09:20 PM
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Joined: Dec 2003
Posts: 5,314 Carstairs, Alberta, Canada
dave571
master
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master
Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
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Cam is a big factor here. In reality, it is the biggest factor in power, throttle response etc.. BUT that said, a small 4 bbl will be easier to tune,a nd easier on fuel. Probalby no difference in all out performance. IMHO 600 is still too large for a stock 273 2 bbl motor. Holley makes 4bbl's into the 300's. 500 or so is plenty for that.
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Re: Big 2 bbl vs sm 4 bbl
[Re: dave571]
#688486
05/04/10 09:28 PM
05/04/10 09:28 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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a stock 273 4bbl intake is pretty decent for a stockish 273 and the 500 eddy is probably going to work the best for a stockish 273.
Just an FYI the holley 2bbl will fit on a 360 2bbl manifold and the manifold can fit the 273 heads with a little grindinng of the bolt holes and port mis match is not too bad as the 2bbl manifolds have slightly smaller ports than a 4bbl manifold, but if it was me I would find a factory 273 4bbl manifold and run a small 4bbl.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Big 2 bbl vs sm 4 bbl
[Re: Pacnorthcuda]
#688488
05/04/10 10:26 PM
05/04/10 10:26 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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The 4bbl progressively dumps in the air and fuel compared to the 2bbl that pretty much dumps n the full 500 at one time. Also remember the 500 cfm 2bbl will not flow as much air as a 500 cfm 4bbl because the 2bbl is rated at twice the vaccume leval the 4bbl is. The 500cfm 2bbl is about the same size as 1/2 of a 750 4bbl.
The 2bbl will be a little too much at low speeds and low throttle angles but not flow enough at WOT at higher RPM. Either c be made to work decent but I would still take the small 4bbl.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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