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Holley 750 Questions
#1024950
07/03/11 01:03 AM
07/03/11 01:03 AM
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Joined: Jan 2003
Posts: 4,287
Morrow, OH
markz528
OP
master
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OP
master
Joined: Jan 2003
Posts: 4,287
Morrow, OH
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I am trying to put a 750 vacuum secondary (3310) carb together for my relatively stock (aftermarket intake - - not sure on the cam) 383 67 Coronet. I was going to go with a 650, but can't get the linkage geometry correct.
Questions about the 750:
- I have (2) 3310 carbs - one with metering block and one with a metering plate. Can I swap the block with the plate? I may have drilled out the plate holes when I was young and stupid. The carb with a metering plate is overall in much better shape.
- What size jets do I start with? What would it have come with originally (using the metering block for the secondary).
- Being relatively stock, what size power valve should I start with?
67 Coronet 500 9.610 @ 139.20 mph
67 Coronet 500 (street car) 14.82 @ 94 mph
69 GTX (clone) - build in progress......
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Re: Holley 750 Questions
[Re: markz528]
#1024952
07/03/11 01:11 AM
07/03/11 01:11 AM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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(1) yes swap it & get a longer chromed dual feed line or cut your current one & add a piece of neoprene hose (looks unsightly but works) (2) not sure on jet size (3) Start w 1/2 of your manifold vacuum amt at idle in gear (auto) w foot on brake or e brake set (neutral if stick).
live every 24 hour block of time like it's your last day on earth
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Re: Holley 750 Questions
[Re: RapidRobert]
#1024953
07/03/11 01:34 AM
07/03/11 01:34 AM
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Joined: Jan 2003
Posts: 9,826
las vegas
70AARcuda
master
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master
Joined: Jan 2003
Posts: 9,826
las vegas
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holley carbs need holley PN 20-7 to get linkage correct.
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)
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Re: Holley 750 Questions
[Re: markz528]
#1024956
07/03/11 01:04 PM
07/03/11 01:04 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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What is binding up/wrong angle? From the side view what is diff between the 2 carbs' throttle bracket assy's w the 20-7 bolted on either one
live every 24 hour block of time like it's your last day on earth
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Re: Holley 750 Questions
[Re: markz528]
#1024958
07/03/11 01:30 PM
07/03/11 01:30 PM
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Joined: Jan 2003
Posts: 5,895
Florida
Locomotion
master
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master
Joined: Jan 2003
Posts: 5,895
Florida
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When converting from the OEM secondary plate to a metering block, the correct jet size will be 75 or 76. I forgot which one, but Holley has a reference chart showing the corresponding jet size for several of their plates.
If the metering block in one of the 3310's is original, then that is the first model of the 3310 and was rated at 780 (3310 or 3310-1). Original jets would have been 76. After they went to the plate for the secondaries, it was re-rated at 750. Don't know off hand what caused the reduced flow, but it's nothing to worry about.
Last edited by Locomotion; 07/03/11 01:34 PM.
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