Re: Do pre 1967 Mopars have a ported vac advance port on carb
[Re: moparx]
#2917988
05/03/21 12:06 PM
05/03/21 12:06 PM
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Joined: Jan 2004
Posts: 8,656 fredericksburg,va
cudaman1969
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i'm not going to start a debate here. everything was ported up to around 74ish [?], then, if i REMEMBER correctly [???] there were trees on the rear of the intake manifold that went to a vacuum "enhancer", then to a temperature sensor in the water pump housing, then to the carb, then to the distributor and vacuum pots controlling the air filter snorkel flaps. i just looked at a 440 out of a 78 newyorker, and a 400 from a 76 newport [both with thermoquads] that are on my shelf, and that is the way they have the myriad of vacuum hoses ran. they were this way when removed, and i just left everything as was just to keep the holes plugged. i "think" this started in 74, because i remember the round multi-port "vacuum enhancer" on the china wall of my wife's 74 charger with a 400/727 combo. remember, this is for the big blocks. i don't remember, nor have, any small blocks to compare. so manifold through temperature [wax pellet] senders to ported. i don't know what this setup could be correctly categorized. Still ported vacuum not straight, all those connections were used so engine got to operating temp first. Look at the advance ‘can’ on a mopar distributor. They ALL pull the plate in the timing advance direction so IF it’s manifold ported it would be in wrong direction, give it gas it drops, let off it advances, backward! Chevy was like that, had one, 70-1/2 Z28
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Re: Do pre 1967 Mopars have a ported vac advance port on carb
[Re: cudaman1969]
#2918014
05/03/21 01:18 PM
05/03/21 01:18 PM
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Sniper
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Still ported vacuum not straight, all those connections were used so engine got to operating temp first. Look at the advance ‘can’ on a mopar distributor. They ALL pull the plate in the timing advance direction so IF it’s manifold ported it would be in wrong direction, give it gas it drops, let off it advances, backward! Chevy was like that, had one, 70-1/2 Z28
Pretty sure you don't know the difference between manifold vacuum and ported vacuum. Also pretty sure you don't understand why vacuum advance is used.
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Re: Do pre 1967 Mopars have a ported vac advance port on carb
[Re: Sniper]
#2918027
05/03/21 01:38 PM
05/03/21 01:38 PM
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Joined: Jan 2004
Posts: 8,656 fredericksburg,va
cudaman1969
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Still ported vacuum not straight, all those connections were used so engine got to operating temp first. Look at the advance ‘can’ on a mopar distributor. They ALL pull the plate in the timing advance direction so IF it’s manifold ported it would be in wrong direction, give it gas it drops, let off it advances, backward! Chevy was like that, had one, 70-1/2 Z28
Pretty sure you don't know the difference between manifold vacuum and ported vacuum. Also pretty sure you don't understand why vacuum advance is used. Pretty sure you’re an a$$, I know exactly what I’m taking about. Do YOU know what manifold vacuum is? Do you know what carb port ABOVE and BELOW the throttle plate is?
Last edited by cudaman1969; 05/03/21 01:39 PM.
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Re: Do pre 1967 Mopars have a ported vac advance port on carb
[Re: cudaman1969]
#2918128
05/03/21 06:37 PM
05/03/21 06:37 PM
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dragon slayer
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Short answer is yes there is a ported vacuum connection on carbs before 67. I have a 62 383-2bbl, and a 62 413-4bbl both have it done in rubber hoses. 1960 413-4bbl has it with a hard steel line. Not for distributor advance Your not serious are you? So what is it for if not distributor? I don't know why you would trash a thread for kicks with mis-information, clearly you are wrong in your statement. But why? That 66 hemi of yours has ported for the distributor.
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Re: Do pre 1967 Mopars have a ported vac advance port on carb
[Re: cudaman1969]
#2918306
05/04/21 08:15 AM
05/04/21 08:15 AM
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Joined: May 2019
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Sniper
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Still ported vacuum not straight, all those connections were used so engine got to operating temp first. Look at the advance ‘can’ on a mopar distributor. They ALL pull the plate in the timing advance direction so IF it’s manifold ported it would be in wrong direction, give it gas it drops, let off it advances, backward! Chevy was like that, had one, 70-1/2 Z28
Pretty sure you don't know the difference between manifold vacuum and ported vacuum. Also pretty sure you don't understand why vacuum advance is used. Pretty sure you’re an a$$, I know exactly what I’m taking about. Do YOU know what manifold vacuum is? Do you know what carb port ABOVE and BELOW the throttle plate is? I know exactly what manifold vacuum is. I know exactly what ported vacuum is. Now tell us what manifold ported is, your terminology.
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Re: Do pre 1967 Mopars have a ported vac advance port on carb
[Re: Tony440]
#2918340
05/04/21 09:57 AM
05/04/21 09:57 AM
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Joined: Nov 2003
Posts: 10,228 Colleyville
3hundred
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Colleyville
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Hello, I have a question related to manifold vs. ported vacuum for the vacuum advance. I know it's not directly related to this thread. But I have a 67 R/T with a 440 that has a Speed Pro cam that's 300/300 at the seat 230/230@.050, 109 LSA and .480 lift. With the vacuum advance hooked to the ported connection(factory) port on the carb the idle is somewhat choppy. I was advised to connect the vacuum advance to manifold vacuum, which I did and this really cleaned up the idle. I almost forgot to mention that I have a six pack setup on the car as well. Does anyone see a problem with using the manifold vacuum for the vacuum advance with this setup? Thanks everyone! Not an expert, I think what's happened is you've added a bunch of initial timing through the vacuum advance and disturbed the operational RPM range aspects of the vacuum advance. I'd put it back to ported, to the center carb metering block and go back and add initial timing to see if the idle stays "cleaned up". 2¢
'68 Fury Convertible '69 300 Convertible '15 Durango 5.7 Hemi '16 300 S Hemi
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Re: Do pre 1967 Mopars have a ported vac advance port on carb
[Re: GODSCOUNTRY340]
#2918363
05/04/21 10:32 AM
05/04/21 10:32 AM
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Joined: Jan 2003
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6PakBee
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Wow. Maybe I'm a cynic but if you have to tell someone the PCV port is not for fuel, they may be better off owning a Prius.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Do pre 1967 Mopars have a ported vac advance port on carb
[Re: Tony440]
#2918385
05/04/21 11:10 AM
05/04/21 11:10 AM
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Joined: Feb 2005
Posts: 534 SW CO
HemiSportFury
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Thanks for the reply. The initial timing is at 10 deg. before, without the vacuum advance hooked up. When you put in a bigger cam you generally need more initial timing to clean up the idle. You did that by switching from ported to manifold vacuum. Adding initial timing also does this but then you may have too much total advance and you may have to recurve the distributor to reduce mechanical advance. If it idles good with manifold advance give it a try. It may work but as you open the throttle manifold vacuum drops and you will loose timing so it may not run well. If you get spark knock then you'll have to get into the distributor at which point you should go back to ported advance and start from there. Good luck.
'64 Sport Fury, 528 Hemi, FiTech EFI, 4-speed, 4.10 Dana 60 '57 Belvedere 2dr sedan, current project in process '19 Cherokee Trail Hawk Elite '03 Ram 2500 CTD HO, 6-speed 214,000 miles and still going strong
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Re: Do pre 1967 Mopars have a ported vac advance port on carb
[Re: 6PakBee]
#2918406
05/04/21 12:27 PM
05/04/21 12:27 PM
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Joined: Aug 2006
Posts: 2,564 God's Country Maryland
GODSCOUNTRY340
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Wow. Maybe I'm a cynic but if you have to tell someone the PCV port is not for fuel, they may be better off owning a Prius. Ha ha, You're absolutely right. But you can bet Edelbrock was getting complaints from some people that their carb was flooding due to them having the fuel line hooked to that port. Plus, they have to protect themselves from the lawyers that sue over everything.
I love the smell of Deer guts in the morning, it smells like... VICTORY!
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