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  351C-4V & Holley 650 Dbl Pumper..Need Tunning Help Pls??

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Author Topic:   351C-4V & Holley 650 Dbl Pumper..Need Tunning Help Pls??
MASTIFF
Journeyman

Posts: 93
From: maumee, Ohio 43537
Registered: May 2001

posted 05-07-2002 07:30 PM     Click Here to See the Profile for MASTIFF   Click Here to Email MASTIFF     Edit/Delete Message   Reply w/Quote
I have a 351C-4V, Wieand Xcelerator Intake Manifold, Stock Heads, Stock Cam, and Stock duel exhaust and need some advice on Carb tunning. I have a 650 Dbl Pumper w/ mechinacal secondaries on it right now and would like advice on where to start with the settings.

Shooters?
Jets?
Pump Cams?
Power Valve?

I measured the Vaccume and it reads 14HG at idel.

Anyone have a similar set up? Any help would be appreciated.

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capri man
Gearhead

Posts: 3385
From: doerun, ga.
Registered: Nov 2000

posted 05-07-2002 07:39 PM     Click Here to See the Profile for capri man   Click Here to Email capri man     Edit/Delete Message   Reply w/Quote
Shooters? 35
Jets? 70/78
Pump Cams?
Power Valve? 6.5
come on guys tell me haw far off i am. i dont have a clue on the pump cam.

------------------
mike r
racing is real
everything else is just a game.
81 capri-7.56 @88mph 1/8
1.56 60 ft.
http://prestage.com/site/site_display.asp?SiteID=141

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70coupe
Gearhead

Posts: 357
From: Toronto,Ontario,Canada
Registered: Aug 2000

posted 05-07-2002 07:47 PM     Click Here to See the Profile for 70coupe     Edit/Delete Message   Reply w/Quote
I would go with the pink cam in the second position. As for squirters, I had good luck with 35 or 37 primary and 31 secondary.
Now if I could just figure out these fancy HP carbs with the air bleeds!!

[This message has been edited by 70coupe (edited 05-07-2002).]

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blown 351
Journeyman

Posts: 64
From: Seattle, Wa. 98258
Registered: Dec 2001

posted 05-08-2002 03:21 PM     Click Here to See the Profile for blown 351   Click Here to Email blown 351     Edit/Delete Message   Reply w/Quote
Shooters: try 31 primary and 28 seconday first
Jets: 68 primary 72 secondary
Pump cams: green primary pink seconday
Power valve: try the 6.5 and see how the midrange acceleration is. If it hesitates from part power to WOT maybe go with a 7.0
14"Hg is a decent amount of vacuum idle.

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MASTIFF
Journeyman

Posts: 93
From: maumee, Ohio 43537
Registered: May 2001

posted 05-08-2002 04:47 PM     Click Here to See the Profile for MASTIFF   Click Here to Email MASTIFF     Edit/Delete Message   Reply w/Quote
I guess I can start with Blown 351 Settings and work my way up to capriman and coupes settings if need be. Thanks for the input. If anyone else has imput go for it.....I'm just tying to get this thing down.

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MASTIFF
Journeyman

Posts: 93
From: maumee, Ohio 43537
Registered: May 2001

posted 05-08-2002 05:28 PM     Click Here to See the Profile for MASTIFF   Click Here to Email MASTIFF     Edit/Delete Message   Reply w/Quote
One more question....Should I be using the 50cc accelerator pumps?

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jkilroy
Gearhead

Posts: 1719
From: Vicksburg, MS
Registered: Dec 99

posted 05-08-2002 05:39 PM     Click Here to See the Profile for jkilroy   Click Here to Email jkilroy     Edit/Delete Message   Reply w/Quote
The air bleeds are fantastic. Basically an air bleed is a controlled leak of air into the fuel stream that is headed for the booster and has already been through the main jet. Air enters though the air bleed orifice and mixes with the fuel through the emulsifier tubes. It allows you to alter the high rpm mixture, in each venturi, without affecting the other.

You want to richen up your high RPM mixture, put in a SMALLER bleed jet, you want to lean it out, put in a BIGGER bleed jet.

------------------
Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"

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MASTIFF
Journeyman

Posts: 93
From: maumee, Ohio 43537
Registered: May 2001

posted 05-08-2002 05:48 PM     Click Here to See the Profile for MASTIFF   Click Here to Email MASTIFF     Edit/Delete Message   Reply w/Quote
This is an old 4150 model. It doesnt have air bleeds I believe. Your response is intresting though.

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