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Holley metering block question #1551473 12/22/13 03:28 PM 12/22/13 03:28 PM
Joined: Sep 2006 Posts: 3,011 Sac, CA M mopowers OP master
mopowers OP master M Joined: Sep 2006 Posts: 3,011 Sac, CA	Is a 4777 (650 DP) primary metering block the same as a 4779 (750 DP) primary metering block??? If not, what are the differences?

Re: Holley metering block question [Re: mopowers] #1551474 12/22/13 03:58 PM 12/22/13 03:58 PM
Joined: Aug 2003 Posts: 43,357 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,357 Bend,OR USA	Quote: Is a 4777 (650 DP) primary metering block the same as a 4779 (750 DP) primary metering block??? If not, what are the differences? Which List #, IE 4777, 4777-2 or?/ carb. do you have? Go to Holleys web site technical pages and look up the part numbers for the metering blocks to see if thier different or the same The early models did not have four corner idle, the newer ones do Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Holley metering block question [Re: mopowers] #1551475 12/22/13 03:58 PM 12/22/13 03:58 PM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	Dont know the answer..but aftermarket metering blocks fit all the 4150 double pumpers 600 to 850...they are not specific on what carb they fit. that might be a clue. Tony 70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)

Re: Holley metering block question [Re: 70AARcuda] #1551476 12/22/13 09:45 PM 12/22/13 09:45 PM
Joined: Sep 2006 Posts: 3,011 Sac, CA M mopowers OP master
mopowers OP master M Joined: Sep 2006 Posts: 3,011 Sac, CA	Thanks guys. The carb is a 4779-2. It has been converted to a 4-corner idle with new baseplate. I haven't been able to get a response from the secondary idle mixture screws. Just noticed today that the secondary metering plate is for a 4777 (a 650 DP). Not sure if that's why I can't get the idle mixture screws to kill the engine or not. Just kinda brainstorming. Wondering if a secondary metering block from a 750 DP would make any difference.. Any ideas??? I plan on calling Holley tomorrow but just wondered what you thought.

Re: Holley metering block question [Re: mopowers] #1551477 12/22/13 09:57 PM 12/22/13 09:57 PM
Joined: Mar 2007 Posts: 3,300 Northern Indiana Dunnuck Racing master
Dunnuck Racing master Joined: Mar 2007 Posts: 3,300 Northern Indiana	The idle air bleeds in the secondary side need to be changed when going to 4 corner idle. Keith www.dunnuckracing.com

Re: Holley metering block question [Re: Dunnuck Racing] #1551478 12/22/13 11:40 PM 12/22/13 11:40 PM
Joined: Aug 2003 Posts: 43,357 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,357 Bend,OR USA	Quote: The idle air bleeds in the secondary side need to be changed when going to 4 corner idle. Keith Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Holley metering block question [Re: Cab_Burge] #1551479 12/23/13 05:16 PM 12/23/13 05:16 PM
Joined: Sep 2006 Posts: 3,011 Sac, CA M mopowers OP master
mopowers OP master M Joined: Sep 2006 Posts: 3,011 Sac, CA	the idle air bleeds on the secondary side are the same size as the primary side. They're the ones on the top outside of the main body, right?

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