holley 3 barrels...

[68ys8030]

hey guys!
i've never run a holley 3 barrel before. I now have a stock 4346 on my 69 and was thinking of trying out a 4781 850. i've heard that the big 3 barrels never ran that good but have never tried one myself. i've seen 950's and 1050's
for sale on ebay. do you think one would out perform an 850 due to the size? maybe pete has tried one.
i am putting the motor back in my car after a few mods and have been thinking at nite about this... i need more MPH!!!
http://www.yenko.net/ubbthreads/images/graemlins/cool.gif let me know what you think.
thanks! steve keech sarasota florida

[JoeG]

On the 950,when you get the secondaries to open at the right time and ample fuel gets delivered to prevent a slight bog it pulls like a bear on top end---All these things can be accomplished with a little work----BUT it can be done much easier with 3310 OR 850 DOUBLE pumper---especially having secondary jets to play with.---JoeG

[COPO PETE]

I have taken the 850 off my ZL-1 and put on a worked 850 that flows 996cfm. The car slowed down a little bit. since that test though, I put on a new fuel pump with my stock 850 and picked up 3 mph!!! So now i will have to try the 996 cfmer again. Keep in mind this is with a stock cam and exhaust manifolds. When i bought that carb, it was for my 55 Chev with a 502/headers and it picked up 3 tenths instantly.
Peter

[Chevy454]

[ QUOTE ]
I have taken the 850 off my ZL-1...

[/ QUOTE ]

Must be nice! http://www.yenko.net/ubbthreads/images/graemlins/tongue.gif

[JoeG]

COPOPETE,
When you said you replaced the fuel pump--was the pump wearing out or did you step up to a pump with more flow --JoeG

[COPO PETE]

It was a brand new GM pump for an L-72. I put an Holley pump on it. Also I use the 3/8 line to "T" with 5/16 which likely does not help it any! Also found it interesting that going from a 780 vac to 850 DP the car picked up 3 tenths in back to back runs. When they tested Charlies ZL-1 in 69 they were running the 780 vac on it from what I understrand!
Peter
Peter

[JoeG]

[quote Also found it interesting that going from a 780 vac to 850 DP the car picked up 3 tenths in back to back runs.
Peter
Peter

[/ QUOTE ]

Just to make sure----You mean you ran 3 tenths quicker???---Joe

[PxTx]

Speaking of the fueling of a Daytona carb, does anyone have a source for mechanical secondary squirters? I had a tough time finding them new- although I did.

[JoeG]

pxtx,
You mean the Gear-Drive Carb injector Motion use to handle???--JoeG

[PxTx]

Yes, Motion used to package it. I scored two NOS ones made by EELCO. I even asked Holley about them but they didn't know much. I beleive several people made them and it appears they are the only band-aid for the jetting issue. I guess another option would be the tunable air bleeds. I'll probably be working on the carb over the summer http://www.yenko.net/ubbthreads/images/graemlins/burnout.gif

[COPO PETE]

850= +3 tenths! http://www.yenko.net/ubbthreads/images/graemlins/smirk.gif
Peter

[JoeG]

THANKS PETE it's been a long day--- http://www.yenko.net/ubbthreads/images/graemlins/wink.gif

pxtx,
http://www.yenko.net/ubbthreads/images/graemlins/cool.gif Nice find---That setup was really meant for a well geared stick set-up for track use, one can learn to live with it on the street, but before you start modifying your 950--you might find some of the lesser solutions to tuning the 950 might work for your car if it is going to be used mostly on the street------Joe

[Pantera]

I took my 3 barrel off and pitched it in the Arkansas river... (not really)

I never used so much gas as with that 3 barrel setup on the street. I actually think I went faster and could drive it on the street so much easier with a double pumper, than the three barrel. On the dragstrip it ran good but was a POS on the street. It would stumble and bog it you got into the secondary at to low of RPM.

[JoeG]

There was no one fix solution to getting the 950 to run properly --mine actually performed very well after several adjustments and initially running 456 gears on the street, but it did use FUEL and unless I was putting this back on a Motion or other dealer car that originally had it ---a 780/850 would be easier to live with.----Joe

[68ys8030]

thanks for all the imput guys ! I built my car to run in the F.A.S.T series. i made 3 passes in the car and realized that my motor was just to mild so out it came and did a ton of work to it. i talked to a guy who sets up chassis for the A/stock stick camaros. hes gunna get my chassis working right for me. the plan is to get everything done and working for the sept 3rd race at the supercar reunion.
modified production. i think the double pumpers will be illegal for the class as they must appear stock and a 4346 is a vaccum secondary. thats why i was wondering about the 3 barrels. i'll let you know how things work out. i guess i'll just have to try a few diffrent carbs... http://www.yenko.net/ubbthreads/images/graemlins/wink.gif
thanks! steve

[John Brown]

Steve, see if you can find a 3418 Holley carb. It's a 855 cfm vacuum sec. carb off a 67 Vette. Looks sorta like a 4346 if you don't look to close...... http://www.yenko.net/ubbthreads/images/graemlins/naughty.gif

[BUIZILLA]

I think I just happen to have a 3418... wait, I know I do http://www.yenko.net/ubbthreads/images/graemlins/naughty.gif

J http://www.yenko.net/ubbthreads/images/graemlins/wink.gif