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Old May 25th, 2011, 09:35 AM   #1
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Default Carb recomendations for a mildly built 350 SBC

I have a 1969 350 4-bolt that has been bored 0.060" over. It has around 9-9.5:1 compression (used an online calculator) aluminum intake, centre dump manifolds, attached to a TH350/231C HD in my heep. It has a HUGE POS cam in it (I will be changing it to this...)

http://www.compcams.com/Company/CC/c...x?csid=90&sb=2

My question is what carb to run...?
I have a couple of half decent quadrabogs, 2-600cfm holleys and 2-700 or 750 Holleys (not sure, would have to verify exact size, one is on the heep, and has been rebuilt and semi-tuned by a supposed Holley tuner... He seems to know what he is talking about?!?!?).

I ran it this weekend offroad and it was an absolute shit-pile!!! I am getting tons of people telling me different shit, and was wondering what anyone here was running for a carb? I have a TBI setup, but need to get a wiring harness or rape the one I have (I know NOTHING about 12V wiring systems). I would go propane as an option, but need to find a way to keep the back seat as I take the kiddies when I go (anyone mount a propane tank where the stock gas tank sits? If so, what type of tank?).

Thanks, Jamie
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Old May 25th, 2011, 09:48 AM   #2
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EFI. Find a holley projection or something. I had to.
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Old May 25th, 2011, 10:17 AM   #3
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I ditched my TBI setup (raped off of a burban and I could never get it to run closed loop correctly, I may try again though) and am running a motorcraft 4350.
This is on an AMC 360, but the same carb can be tuned for more fuel.

I have found the MC4350 to work well even off camber. There are alot of jeepers with 258's that use the MC2100 with A LOT of success, this is basically the same carb just the 4bbl version. You can usually find them fairly cheap i you want to try one and see how it does.

The other option is the holley truck avenger, many swear it is great off-road, may be another avenue to pursue.
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Old May 25th, 2011, 11:07 AM   #4
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the edelbrock carbs are idiot proof. they run well at angles. they can be found used for a decent price. quadra jets work pretty good off road too. id avoid the holley unless you buy the truck avenger. holleys can be a bitch to tune for a guy that is not carb savy. most dont like angles, unless built for it.
the motorcraft sandals mentioned would work well i bet. their 2bbls work pretty well off road.

for a 9.5 to 1 motor with a mild cam you could get a tbi set up too. too much cam will hurt ya with tbi though.
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Old May 25th, 2011, 11:46 AM   #5
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Edelbrock carbs suck offroad. I ran a variety of setups and tried the offroad needle & seats don't do much for you. Go to the Holley Truck Avenger. You won't regret it.
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Old May 25th, 2011, 11:59 AM   #6
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TBI or find a TPI setup
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Old May 25th, 2011, 02:22 PM   #7
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Thanks for the quick responses... I guess I will start weighing out my options... and bank account...
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Old May 25th, 2011, 02:28 PM   #8
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I love pane!
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Old May 25th, 2011, 10:47 PM   #9
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Ok... where'd you put the tank?
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Old May 26th, 2011, 12:27 AM   #10
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EFI, or Edelbrock 600. Can't stand Holley's, I bought the street avenger 770 for my Camaro and it was a huge POS. Accelerator pump would not work no matter what I did (even had a Holley guy look at it). The car would not get out of it's own way, put the Edelbrock 750 back on it and I couldn't get traction through 3rd.
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Old May 26th, 2011, 12:37 AM   #11
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i just switched from a holley double pumper to an edelbrock 750 and it woke my engine right up, runs the best it ever has...built 350, 30 over aluminum pistons, 10:1, 194 valves, roller rockers, comp cam,
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Old May 26th, 2011, 01:10 AM   #12
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Quote:
Originally Posted by Blksnshn69 View Post
EFI, or Edelbrock 600. Can't stand Holley's, I bought the street avenger 770 for my Camaro and it was a huge POS. Accelerator pump would not work no matter what I did (even had a Holley guy look at it). The car would not get out of it's own way, put the Edelbrock 750 back on it and I couldn't get traction through 3rd.
FYI running a the same carb on a street car and an offroad vehicle will yield WILDLY different results
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Old May 26th, 2011, 07:10 AM   #13
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Quote:
Originally Posted by Sandals View Post
FYI running a the same carb on a street car and an offroad vehicle will yield WILDLY different results
Ding ding ding we have a winner. Street or mud drags is completely different than bouncing up steep hills or getting off camber.
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Old May 26th, 2011, 07:14 AM   #14
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If you can get the floats set correctly, that engine would be a prime candidate for a holley 4160 - for the street.

No idea for offroad, but I do have a TBI manifold you can have.
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Old May 26th, 2011, 07:46 AM   #15
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X2 pane ftw!
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Old May 26th, 2011, 08:15 AM   #16
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Quote:
Originally Posted by ScOoTeR View Post
If you can get the floats set correctly, that engine would be a prime candidate for a holley 4160 - for the street.

No idea for offroad, but I do have a TBI manifold you can have.
Is it a cast steel TBI intake... I understand that I have to hog out a couple of holes and make some fancy tapered washers to get one to mount to the older SBC blocks because of the bolt angles... I am interested though... Thanks Scooter!
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Old May 26th, 2011, 08:51 AM   #17
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It is Aluminum.
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Old May 26th, 2011, 12:43 PM   #18
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I had a very similar motor, not bored as much but bigger cam and small cc heads and ran the 650cfm Truck Avenger with great results.
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Old May 26th, 2011, 03:41 PM   #19
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Quote:
Originally Posted by ScOoTeR View Post
It is Aluminum.
Sold... PM me for what you want for it and need for shipping...
Thanks, Jamie
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Old May 26th, 2011, 05:18 PM   #20
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Quote:
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Sold... PM me for what you want for it and need for shipping...
Thanks, Jamie
You have any way for me to ship to an address in America? Price is negotiable - and it's sitting on top of a set of 882 heads - so I could give a go at the center bolts so you don't get any shit in yer engine.

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