Author Topic: 750 dbl pumper  (Read 11495 times)

Offline 305chevy c-10

  • Frequent Member
  • **
  • Posts: 292
750 dbl pumper
« on: March 12, 2011, 10:20:39 AM »
has anyone ran a 750 holley dbl pumper on a mild 355 engine .or will it be just to costly to drive ....with gas 3.55gallon ...ifso what about a 600 or 650 dbl
Heartbeat of America yesterday's cheverolet
18T5C10

Offline thirsty

  • Senior Member
  • ****
  • Posts: 1289
    • Suitor's Garage
Re: 750 dbl pumper
« Reply #1 on: March 12, 2011, 05:57:01 PM »
I would run the 600.
Real trucks are built, not bought Build thread

Give me a long enough lever and a place to stand, and I shall move the earth or break this bolt...Whatever, just hold my beer!

Offline motion427

  • Newbie
  • Posts: 47
Re: 750 dbl pumper
« Reply #2 on: March 12, 2011, 06:42:23 PM »
I'd have to agree,600-650 range for a mild 355 in a truck with a normal converter and mild gears.
Unless you would have like a 3000 RPM converter,and 4.11 ring and pinion,then a double pumper would be a good choice.
86 K10,350 Roller Cam,T350,NP205,10 bolt posi,12 bolt posi,33" tires.
85 K30,454,T400,NP205,Dana 60,14 bolt,being built now.
04 Avalanche Z71,6.0L,TVS 1900,Dynatech,Corsa,etc...
06 TBSS,AWD,6.0L,Kooks,C6 fan kit,etc...
75 Nova SS,502,T350,12 bolt

Offline 305chevy c-10

  • Frequent Member
  • **
  • Posts: 292
Re: 750 dbl pumper
« Reply #3 on: March 12, 2011, 08:23:03 PM »
maybe a 2500 stall and 3.42 rpm air gap intake ,vortec style heads
Heartbeat of America yesterday's cheverolet
18T5C10

Offline roger97338

  • Registered Users
  • *
  • Posts: 229
Re: 750 dbl pumper
« Reply #4 on: March 17, 2011, 07:48:12 PM »
Over 15 years ago, I ran a 750 double pumper on a mild small block. It ran horribly, truly a waste of time and energy. Everyone I knew even told me before I did it that I shouldn't do it. But, the carb was free, blah blah blah...yeah. It didn't work out well at all. I think I traded it to someone for a 600 or 650.

Offline three8six

  • Frequent Member
  • **
  • Posts: 486
Re: 750 dbl pumper
« Reply #5 on: March 18, 2011, 09:29:15 AM »
x2 what everyone else said, too big

Offline figure843

  • Newbie
  • Posts: 36
Re: 750 dbl pumper
« Reply #6 on: March 18, 2011, 05:45:35 PM »
I have a holley 600cfm with stock jets on my mild 350. runs perrrrrfect. You can always go with bigger jets and squirters. ;D
1984 SILVERADO LWB 350/400
1988 SILVERADO K5 BLAZER 350/700R4/NP208/3:73/6"RC LIFT/38.5/15/15 BOGGERS

Offline ToddN

  • Newbie
  • Posts: 93
Re: 750 dbl pumper
« Reply #7 on: March 18, 2011, 05:47:14 PM »
750's are for big blocks.  Period.
A government big enough to give you everything you need, is a government big enough to take everything you have.

Offline slammed79

  • Senior Member
  • ****
  • Posts: 1367
  • Thou shalt not drive stock
Re: 750 dbl pumper
« Reply #8 on: March 20, 2011, 10:03:19 PM »
750's are for big blocks.  Period.

or smallblocks with forced induction!
74 C10 Long bed 350/SM465 Lowered on 20's

Praise the lowered

Offline the dan

  • Frequent Member
  • **
  • Posts: 321
Re: 750 dbl pumper
« Reply #9 on: March 21, 2011, 01:41:14 AM »
a nice 650 single pump vacuum secondary is the way to go for a mild street daily driver motor
83 C10 Pro-touring, Forged 408 Stroker LS, Paxton supercharger, T56 magnum, Detroit 9", and horrible paint

Offline team39763

  • Senior Member
  • ****
  • Posts: 1194
Re: 750 dbl pumper
« Reply #10 on: March 25, 2011, 05:15:03 PM »
A 750 can be made to work, you just gotta spend some time tuning it.  I ran a 750 on my smallblock for years.  I had problems, but I think they were due to the carb having trash in it, me not knowing how to tune, and a big vacuume leak.  I've even used a 850 doublepumper on my motor when it was a little more stockish.  If you're lookin' for gas mileage, you're lookin' at the wrong carbs.

Offline 305chevy c-10

  • Frequent Member
  • **
  • Posts: 292
Re: 750 dbl pumper
« Reply #11 on: April 03, 2011, 05:10:03 PM »
ok i get it ......will go with 600-650 and electric fuel pump
Heartbeat of America yesterday's cheverolet
18T5C10

Offline 305chevy c-10

  • Frequent Member
  • **
  • Posts: 292
Re: 750 dbl pumper
« Reply #12 on: January 12, 2012, 09:15:54 PM »
i made i mistake my carb is a 750 with dual feed lines ,not a dbl pumper if this makes a difference in if it would work in my  383 app .
Heartbeat of America yesterday's cheverolet
18T5C10

Offline 305chevy c-10

  • Frequent Member
  • **
  • Posts: 292
Re: 750 dbl pumper
« Reply #13 on: January 13, 2012, 10:43:17 PM »
my carb is a 80508-1 holley daul feed elect choke /vac sec 750 .my question is has anyone ever put smaller jets in a 4160 carb like this.i think this route would be cheaper ( re-jet and rebuild it )verses buyin g a 650 carb for my 383 .i realy like the dual feed set up look .
Heartbeat of America yesterday's cheverolet
18T5C10

Offline necromonger

  • Newbie
  • Posts: 83
Re: 750 dbl pumper
« Reply #14 on: January 14, 2012, 07:39:31 AM »
you can't get calibration kit for a holly that i know of.That is why i like carter or Edelbrock If you have your timing right and your spark advance is tuned right you can tune them pretty easy.
new build,1978 chevy 3/4 ton 2 wheel drive 350 4 speed trans.