Carburetor Choice & Why ???? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

decodan · 12-08-2005, 07:27 PM

I am changing to a Clifford Intake.

Here's the Question...
If you were going to update the carburetor on a 292ci 6 cylinder which way is the best overall way to go. Keeping in mind that this is not a racing truck but for just general use and best possible mileage.

Would you go with a 350cfm 2 bbl carburetor or one of the small 390cfm 4 bbl carbs? Or is there a better choice and why?

My thoughts are if I go with the 390cfm 4 bbl it would get better mileage just cruising but if I needed the extra "umph" the secondarys would provide it.

I am sure there are many of you out there that have done these changes. Please give me your thoughts. Thanks, Dan

jgrh64 · 12-10-2005, 03:00 PM

The Clifford is a high RPM horsepower manifold, the offy is a lower speed torque manifold. Make sure you keep some sort of manifold heat whether it's from the exhaust or water heat unless all your doing is racing.The 390 4 bbl is what most people use,as you say the small primaries keep up the torque and mpg.You just have to stay out of the secondaries, easier said than done. Also try inliners international for more tips .

decodan · 12-10-2005, 07:01 PM

Hey,
So where is the stock manifold on this scale? Thanks, Dan

12-08-2005, 07:27 PM	#1
decodan C-20 Long Stroker Join Date: Oct 2005 Location: Frohna, MO Posts: 137	Carburetor Choice & Why ???? I am changing to a Clifford Intake. Here's the Question... If you were going to update the carburetor on a 292ci 6 cylinder which way is the best overall way to go. Keeping in mind that this is not a racing truck but for just general use and best possible mileage. Would you go with a 350cfm 2 bbl carburetor or one of the small 390cfm 4 bbl carbs? Or is there a better choice and why? My thoughts are if I go with the 390cfm 4 bbl it would get better mileage just cruising but if I needed the extra "umph" the secondarys would provide it. I am sure there are many of you out there that have done these changes. Please give me your thoughts. Thanks, Dan __________________ "A Hand Shake Is Your Word." Decodan ************************ 1951 Chevrolet Suburban 1952 GMC Suburban 1963 Mercury Comet 2-dr (Sorry, I know) 1963 Mercury Comet 2-dr Parts Car, (better than what I originally started with) 2010 F-150 4WD 2015 Subaru Outback (what the hey, got to have one that is not a gas hog)

12-10-2005, 03:00 PM	#2
jgrh64 Prestige member Old Farts Club Join Date: Nov 2005 Location: Cleveland Posts: 502	Re: Carburetor Choice & Why ???? The Clifford is a high RPM horsepower manifold, the offy is a lower speed torque manifold. Make sure you keep some sort of manifold heat whether it's from the exhaust or water heat unless all your doing is racing.The 390 4 bbl is what most people use,as you say the small primaries keep up the torque and mpg.You just have to stay out of the secondaries, easier said than done. Also try inliners international for more tips . __________________ Hey sombodys gotta do it!

12-10-2005, 07:01 PM	#3
decodan C-20 Long Stroker Join Date: Oct 2005 Location: Frohna, MO Posts: 137	Re: Carburetor Choice & Why ???? Hey, So where is the stock manifold on this scale? Thanks, Dan __________________ "A Hand Shake Is Your Word." Decodan ************************ 1951 Chevrolet Suburban 1952 GMC Suburban 1963 Mercury Comet 2-dr (Sorry, I know) 1963 Mercury Comet 2-dr Parts Car, (better than what I originally started with) 2010 F-150 4WD 2015 Subaru Outback (what the hey, got to have one that is not a gas hog)



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.