292 L6 4bbl carb fuel pump questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

GMC1967 · 05-06-2002, 10:14 AM

Hey has anyone put a 4bbl on their inline 292? I have had mine all set up for a while, but haven't run it yet, the only stock part on the whole motor is the fuel pump, I was wondering if this is going to have enough flow to feed the big holley 600.

texnician01 · 05-06-2002, 10:28 AM

should feed it just fine. remember that you can't put much more fuel in than the stock carb did cause you would flood the motor so it shouldn't have a problem. at really high rpm's it may but the 292 redlines at about 4 grand so it'll be ok. 600 CFM seems quite large for a 292. I think you may be happier with something like a 390 or so. you may have problems with an off idle dead spot and losing low end torque cause the intake velocity is not high enough to pull fuel through the big holley. a 390 would keep intake velocity higher and may be more desireable. just my .02

Nathan

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1969 C-10 292 I-6 4 spd in the middle of a restoration. going to get a 327 and 3.07 gears but keeping all of the original parts so I can put it back to original later on down the road.
55 chevy 4 door 150
47 Willys CJ-2A

tom hand · 05-06-2002, 10:28 AM

Hers a page of guys that run 4 barrels on mopars sixes,might have some information that could help.
http://www.slantsix.org/articles/rac...ual/carbs.html

Is your carb a vacuum secondary or a manual secondary carb. If it is a really hot motor it might not be enough pump,but if the motor is not highly modified it will propably be too much carb,might need to go to a 390 Holley.

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72 GMC Sierra SWB almost finished---- 84 Softail
Olive Branch MS

stelth2002 · 05-06-2002, 10:40 AM

I run a similar setup. I have a afb 500 4bbl on mine. I have been really happpy with the results after a lot of tuning. The fuel pump should be alright, if your not a racer. 600 cfm seems a little big. Hope that it is vacuum sec. I have really good low end tourque right now with mine. Overall I think a stock on will work it you dont race it.

Also what do you "redline" your motor at?

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67 Chevrolet LWB with rebuilt 292. 415 ft. lbs of torque, 4 speed, 3.73 Posi, straight and almost painted.

GMC1967 · 05-06-2002, 02:15 PM

Yes well, I was worried the carb might be a bit much, but I bought it years ago and thought i'd use it. I was thinking of down jetting it, that would probably fix my problem, at least that's what i'm thinking.

**BIG ORANGE** · 05-09-2002, 02:32 PM

I have a holley 390 cfm that will work on your 292 for $100.00 plus ship if your interested.Hope this helps.

------------------
1971 chevy suburban (BIG ORANGE)
1970,68,90 swb Little BUCKS one day
67/72 truck parts bought/sold
LIFE IS GOOD,THANK GOD FOR IT!

**'68OrangeSunshine** · 05-10-2002, 07:42 PM

I have a 292 w/390 cfm Holley on my pickup. Been running with the stock fuel pump for years. I would'nt use the electric fuel pump for anything less than a BBC.

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Every 25 years I like to rebuild that 292, whether it needs it or not.

05-06-2002, 10:14 AM	#1
GMC1967 Registered User Join Date: Jan 2002 Location: South Deerfield, MA Posts: 162	292 L6 4bbl carb fuel pump questions Hey has anyone put a 4bbl on their inline 292? I have had mine all set up for a while, but haven't run it yet, the only stock part on the whole motor is the fuel pump, I was wondering if this is going to have enough flow to feed the big holley 600. __________________ 1967 GMC Custom 8ft Fleetside 292 L6, 4spd. 1973 Oldsmobile Delta 88 Convertible 455, TH 400 1969 F#$% Bronco 302, 3spd 4.11's 1958 Oldsmobile Super 88 Fiesta Wagon

05-06-2002, 10:28 AM	#2
texnician01 Senior Member Join Date: Mar 2002 Location: 12 Miles South of Des Moines, Iowa Posts: 359	should feed it just fine. remember that you can't put much more fuel in than the stock carb did cause you would flood the motor so it shouldn't have a problem. at really high rpm's it may but the 292 redlines at about 4 grand so it'll be ok. 600 CFM seems quite large for a 292. I think you may be happier with something like a 390 or so. you may have problems with an off idle dead spot and losing low end torque cause the intake velocity is not high enough to pull fuel through the big holley. a 390 would keep intake velocity higher and may be more desireable. just my .02 Nathan ------------------ 1969 C-10 292 I-6 4 spd in the middle of a restoration. going to get a 327 and 3.07 gears but keeping all of the original parts so I can put it back to original later on down the road. 55 chevy 4 door 150 47 Willys CJ-2A __________________ 69 C-10, 340HP 327 55 chevy 4 door 150 47 Willys CJ-2A 05 Harley Night Train 06 1200 Sportster (Wife's bike) 70 Honda CL350 OIF2 & OIF7 Veteran Nathan & Tiffany

05-06-2002, 10:28 AM	#3
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	Hers a page of guys that run 4 barrels on mopars sixes,might have some information that could help. http://www.slantsix.org/articles/rac...ual/carbs.html Is your carb a vacuum secondary or a manual secondary carb. If it is a really hot motor it might not be enough pump,but if the motor is not highly modified it will propably be too much carb,might need to go to a 390 Holley. ------------------ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS

05-06-2002, 10:40 AM	#4
stelth2002 Young Gun wth Fast Inline Join Date: Jan 2002 Location: Idaho Posts: 1,475	I run a similar setup. I have a afb 500 4bbl on mine. I have been really happpy with the results after a lot of tuning. The fuel pump should be alright, if your not a racer. 600 cfm seems a little big. Hope that it is vacuum sec. I have really good low end tourque right now with mine. Overall I think a stock on will work it you dont race it. Also what do you "redline" your motor at? ------------------ 67 Chevrolet LWB with rebuilt 292. 415 ft. lbs of torque, 4 speed, 3.73 Posi, straight and almost painted. __________________ 1967 Chevrolet LWB with built 292! 415 ft. lbs of torque, 4 speed :O with 27% overdrive too, 3.73 Posi. Frame and body done... getting painted!!!

05-06-2002, 02:15 PM	#5
GMC1967 Registered User Join Date: Jan 2002 Location: South Deerfield, MA Posts: 162	Yes well, I was worried the carb might be a bit much, but I bought it years ago and thought i'd use it. I was thinking of down jetting it, that would probably fix my problem, at least that's what i'm thinking. __________________ 1967 GMC Custom 8ft Fleetside 292 L6, 4spd. 1973 Oldsmobile Delta 88 Convertible 455, TH 400 1969 F#$% Bronco 302, 3spd 4.11's 1958 Oldsmobile Super 88 Fiesta Wagon

05-09-2002, 02:32 PM	#6
BIG ORANGE Senior Member Join Date: Oct 2001 Location: Lancaster S.C. Posts: 4,764	I have a holley 390 cfm that will work on your 292 for $100.00 plus ship if your interested.Hope this helps. ------------------ 1971 chevy suburban (BIG ORANGE) 1970,68,90 swb Little BUCKS one day 67/72 truck parts bought/sold LIFE IS GOOD,THANK GOD FOR IT! __________________ Things happen for a reason!

05-10-2002, 07:42 PM	#7
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,504	I have a 292 w/390 cfm Holley on my pickup. Been running with the stock fuel pump for years. I would'nt use the electric fuel pump for anything less than a BBC. ------------------ Every 25 years I like to rebuild that 292, whether it needs it or not. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

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