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Username Post: Holley Accelerator Cams & Squirters        (Topic#199648)
HQ@NZ 
Senior Member
Posts: 524

Loc: New Zealand
Reg: 06-09-01
09-25-08 09:56 PM - Post#1529652    

Hi,
I am going to try and fix the stumble my car has soon. From what I read (and have been told here in the past) the best place to start is the squirter(s) and pump cams.
The motor is as per sig below.
I have had a 750 vs on it, and it now has a Holley 700 DP. When you floor it, the car hesitates, and sometimes the carb backfires.
The 700 has a 30 front and 31 rear squirter, pink cam in front, black in rear (both in position 1).
30cc pump.

The 750 vs had a 31 squirter, 30cc pump, orange cam.

The 1050 3 barrel has a 50cc pump, 35 squirter, yellow cam. (I haven't tried this carb yet, as I want to run a gasket set through it).

Anyway...

I have several spare 'cams' orange, black, and a white/cream/dirty coloured one - these are all about 5mm deep. I also have a blue one, which is about 6mm deep, with a lip on it. Am I correct that the 6mm one is for 50cc pumps, and the 5mm ones for 30cc pumps?

I am thinking about trying the 35 & 37 squirters in the 700dp to see what happens. I think in theory these should have the 50cc pump though?

Am I on the right track trying the squirters first?
I can get new ones, but would like to have SOME idea of the right size before buying some.

Any comments?

Thanks !
73 HQ Premier Sedan. 383 Chev, Crane 114681, SII heads, 1.6 & 2.08 valves, manual TH350, 9" Diff, Dual 3" exhaust, lowered.


 
HQ@NZ 
Senior Member
Posts: 524

Loc: New Zealand
Reg: 06-09-01
09-25-08 10:03 PM - Post#1529655    
    In response to HQ@NZ

oops..
The intake is a Single Plane Super Victor 2925.
I don't really want to change the intake - yes I know an Edelbrock Air Gap Dual plane would probably be better for the street

Also, once past the stumble, the car runs fine, no other issues.

Thanks !
73 HQ Premier Sedan. 383 Chev, Crane 114681, SII heads, 1.6 & 2.08 valves, manual TH350, 9" Diff, Dual 3" exhaust, lowered.


 
motorman 
Super Senior Member
Posts: 5160

Loc: south western pa.
Reg: 01-25-00
09-25-08 10:13 PM - Post#1529658    
    In response to HQ@NZ

i will sent by email the specs on holley pump cams that tells you the cc volume for each cam and position. what is the list number of the holley carb ?? the cc volume stated is for 10 full pumps of the cam
retired race engine builder,former NASCAR tech inspector. new corvettes owned 1959,1962,1963,1964,1965, 1966,1997,1999,2002,2005, 2008 plus 30+ other chevy cars and trucks along the way. 2008 corvette sold and waiting on a C-7.


Edited by motorman on 09-25-08 10:16 PM. Reason for edit: No reason given.

 
HQ@NZ 
Senior Member
Posts: 524

Loc: New Zealand
Reg: 06-09-01
09-25-08 10:21 PM - Post#1529664    
    In response to motorman

List numbers:

Holley 700 double pumper = 4778-8 and 1746
Holley 750 vac sec = 3310-6 and 2908
Holley 1050 vac sec = 4604-S

The Holley 700 is the one on it at the moment.
I'd ultimately like to run the 1050 (basically for the 'different' factor admittedly ), but would like to sort the 700 first.
73 HQ Premier Sedan. 383 Chev, Crane 114681, SII heads, 1.6 & 2.08 valves, manual TH350, 9" Diff, Dual 3" exhaust, lowered.


 
jimmmy57 
Contributor
Posts: 362
jimmmy57
Loc: Australia
Reg: 03-08-08
09-26-08 02:18 AM - Post#1529698    
    In response to HQ@NZ

Perhaps it would be good idea to make sure the powervalve is the right vacuum and working ok then fool around with the pumps.
Jimmy

"I've told you a million times, , Don't exagerate"
http://www.picturetrail.com/gallery/view?uid=1087 1...


 
racecar100 
Contributor
Posts: 123

Reg: 09-04-07
09-26-08 06:19 AM - Post#1529771    
    In response to jimmmy57

The White (#218) Cam is the best one I've found for street in #2 hole. It will squrt quicker than any color when you hit the throttle.

 
Mike 
Senior Member
Posts: 8136

Reg: 06-30-00
09-26-08 06:39 AM - Post#1529779    
    In response to racecar100

Just an FYI:



Edited by Mike on 09-26-08 06:39 AM. Reason for edit: No reason given.

 
motorman 
Super Senior Member
Posts: 5160

Loc: south western pa.
Reg: 01-25-00
09-26-08 11:44 AM - Post#1529978    
    In response to HQ@NZ

the 4778-8 should have a #330 cam on the pri and a #664 on the secondary. squirters 28 and 31
retired race engine builder,former NASCAR tech inspector. new corvettes owned 1959,1962,1963,1964,1965, 1966,1997,1999,2002,2005, 2008 plus 30+ other chevy cars and trucks along the way. 2008 corvette sold and waiting on a C-7.


Edited by motorman on 09-26-08 11:48 AM. Reason for edit: No reason given.

 
fritz1990 
Senior Member
Posts: 6389
fritz1990
Age: 52
Loc: Kansas
Reg: 02-16-03
09-26-08 11:48 AM - Post#1529980    
    In response to motorman

  • motorman Said:
i will sent by email the specs on holley pump cams that tells you the cc volume for each cam and position. what is the list number of the holley carb ?? the cc volume stated is for 10 full pumps of the cam






Here is the sheet that motorman sent me.

Regards, Jeff
1998 K1500 6.5 Coal burner
1965 C10 with 498 BBC AFR Heads
1964 C10 Ran 348W for 6 years, now SBC.

Corvettes owned: '74 '77 '78 L82 Silver Anniversary, 2002 LS1

Don't have a nervous come together!

http://picasaweb.google.com/fritz199090


 
HQ@NZ 
Senior Member
Posts: 524

Loc: New Zealand
Reg: 06-09-01
09-26-08 12:13 PM - Post#1529988    
    In response to fritz1990

Thanks everyone - I will have a proper look at this tomorrow (daughters birthday party today !).
Thanks Motorman for sending me the info too.

Am I correct in my thoughts that any of my cams that match the numbers in the list from motorman are definitely for the 30cc pump? (therefore the blue IS from a 50cc pump).

Thanks !
73 HQ Premier Sedan. 383 Chev, Crane 114681, SII heads, 1.6 & 2.08 valves, manual TH350, 9" Diff, Dual 3" exhaust, lowered.


 
motorman 
Super Senior Member
Posts: 5160

Loc: south western pa.
Reg: 01-25-00
09-26-08 03:38 PM - Post#1530143    
    In response to HQ@NZ

336 brown is a 50 cc pump cam
retired race engine builder,former NASCAR tech inspector. new corvettes owned 1959,1962,1963,1964,1965, 1966,1997,1999,2002,2005, 2008 plus 30+ other chevy cars and trucks along the way. 2008 corvette sold and waiting on a C-7.


 
HQ@NZ 
Senior Member
Posts: 524

Loc: New Zealand
Reg: 06-09-01
10-01-08 11:36 PM - Post#1533496    
    In response to motorman

Just swapped the squirters in the 700 out.
They were 28 front, 31 rear (obviously I misread the front before). I swapped in a 31 front and 35 rear - I guess that was a bit of a jump, but it was all I had 'lying around'. Both of the new squirters I have swapped in have the 'legs' to direct the gas. I haven't had it on the road yet, but it *seems* better giving it a static rev, but can't tell until I get to drive it (next week probably). Can certainly see a big squirt from them.
Will be booking in for a dyno tune week after too, so if I can't sort it, maybe they can.
Will also finally be swapping in the MSD dizzy, so can get the advance etc sorted at the same time.
Hoping to get it ready in time for a local car clubs 'drag meet' so I can try it on the quarter, but can't do that until the exhaust and tune is sorted first.
Firgers crossed it works out
73 HQ Premier Sedan. 383 Chev, Crane 114681, SII heads, 1.6 & 2.08 valves, manual TH350, 9" Diff, Dual 3" exhaust, lowered.


 
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