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  reccomendations wanted for holley carb spring

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Author Topic:   reccomendations wanted for holley carb spring
badazzcougar
Gearhead

Posts: 132
From: Seattle
Registered: Oct 2001

posted 12-01-2001 01:04 AM     Click Here to See the Profile for badazzcougar   Click Here to Email badazzcougar     Edit/Delete Message   Reply w/Quote
Ive got a holley 3310 - 750 vacuum secondary that I'll be replacing the main body with a proform unit before I install it on my new engine and I need some advice on the secondary opening spring. Currently I have an uncolored spring in it. I do have the spring set but I do not have the instruction paperwork with the color codes so if someone could give me a hand here I'd appreciate it.

heres the breakdown of the car for raw data

351 C 10.2 compression, comp cams 280H , mild ported 2V heads with 4V exhaust valves, free flowing exhaust with headers and flowmasters, weiand single plane excellerator intake , 3310 holley with proform main body, 3200 lb 1970 cougar with 4.10 gears and 2500 stall converter ( maybe higher now that I'll have a lot more lower end torque ). I'm assuming a 6500 rpm redline because of the cam petering out about then but the motors built to live somewhat comfortably at 7000.

Also would it be worth my while to install a 50 CC accelerator pump or would I just be washing my cylinders ?

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Just Jim
Gearhead

Posts: 373
From: So Cal
Registered: Feb 2000

posted 12-01-2001 11:35 AM     Click Here to See the Profile for Just Jim     Edit/Delete Message   Reply w/Quote
My Falcon 351W is similar to yours except it's not a Cleveland,but has a 3310 modified by the old So Cal Carb Shop. It works good with the short yellow spring,72 primary and 80 secondary jets with a #31 squirter. I would recommend getting the secondary spring set and quick change secondary housing to allow you to tune it easier. I don't think you will need the 50cc pump. Just my 2 cents.
I'm curious how that Proform carb body will work.

------------------
"Just Falcon Around"
1962 Falcon 351W
1958 Morris Minor 289

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Hans olsson
Gearhead

Posts: 145
From: Eskilstuna Sweden
Registered: Apr 2000

posted 12-01-2001 12:08 PM     Click Here to See the Profile for Hans olsson   Click Here to Email Hans olsson     Edit/Delete Message   Reply w/Quote
We have a 4628 780cfm holley and we have made the best runs with no spring at all. By launching at wot on the two step(3200 rpm) you also bypass the pump shot.When the light turns green all four barrels are already open. It works for us .

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  • 71 Mach1 351c
  • E/SA 11.89-110
  • F/SA 11.92-110

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badazzcougar
Gearhead

Posts: 132
From: Seattle
Registered: Oct 2001

posted 12-01-2001 12:52 PM     Click Here to See the Profile for badazzcougar   Click Here to Email badazzcougar     Edit/Delete Message   Reply w/Quote
This is for a daily driver so I dont think no spring will be a good option. I had used the short yellow before but the bog was noticeable although with the new engine it'll be a new world. I'l have to pick up a quick change kit and install it with the main body when all that gets here next week. I cant put the motor in until I get my new headers anyway. Ive got 4V headers in the car and although some have had success doing it, I dont trust the 4V header flange against 2V heads.

DAMN JEGGS TAKES SO LONG !!!!

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Just Jim
Gearhead

Posts: 373
From: So Cal
Registered: Feb 2000

posted 12-01-2001 07:20 PM     Click Here to See the Profile for Just Jim     Edit/Delete Message   Reply w/Quote
While I had good luck with the short yellow spring every car is different and will require some tuning.I cured a bad hesitation my Morris had by going to a long yellow spring to replace the white spring which I forgot I had installed.Took a while to figure out where the bog was coming from.

I have better luck with Summit as they ship out of Reno for us west coast guys. Jegs takes over a week,Summit takes 2-3 days.

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"Just Falcon Around"
1962 Falcon 351W
1958 Morris Minor 289

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chips67
Gearhead

Posts: 537
From: louisville, ky, usa
Registered: Jul 2001

posted 12-01-2001 08:02 PM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
let this be the lesson....the springs go in this order from lightest to heaviest....yellowshort/yellow/purple/plain/brown/black. i dont know where the white one fits into this lineup. install the light spring and listen for a bog...usually between 2-3k rpm. i like to remove the breather so i can hear the carb better. if it bogs, step the spring up until it quits. the breather installed makes it open earlier, keep this in mind. in general, heavier cars take a stiffer secondary spring. i built a mild used 302 for my dad's f-100, the lighter springs didnt work well...it bogged. it didnt like the light distributor springs either for that matter. your trying to basically time the permormance capability with the weight of the vehicle. a quick change kit for the secondary spring is REAL NICE TO HAVE.

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67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.79 60ft. time.

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badazzcougar
Gearhead

Posts: 132
From: Seattle
Registered: Oct 2001

posted 12-01-2001 09:22 PM     Click Here to See the Profile for badazzcougar   Click Here to Email badazzcougar     Edit/Delete Message   Reply w/Quote
unfortunately I had to order from Jegs on that one. They had the proform bodies for $99 which seems like a screaming deal to me plus theres a $10 rebate from proform. Hard to go wrong with that one. I was about to take my holley into work to mill the airhorn off but now I dont have to.

That 2-3 day deliver time from summit is hard to beat.

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