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Holley 750 ?? #1262020 07/05/12 10:12 AM 07/05/12 10:12 AM
Joined: May 2003 Posts: 1,527 Michigan G GoDartGo OP pro stock
GoDartGo OP pro stock G Joined: May 2003 Posts: 1,527 Michigan	I'm new to the 750 DP. So, what is the vac port for, that is on the front metering block on the choke side just above the idle screw? I am "testing" a friends 750 who got it from a guy who got it from...............I might buy it. Last edited by GoDartGo; 07/05/12 10:14 AM.

Re: Holley 750 ?? [Re: GoDartGo] #1262021 07/05/12 10:13 AM 07/05/12 10:13 AM
Joined: Jan 2003 Posts: 17,861 albany ny 0 05dakota I Live Here
05dakota I Live Here 0 Joined: Jan 2003 Posts: 17,861 albany ny	distributor advance?

Re: Holley 750 ?? [Re: 05dakota] #1262022 07/05/12 10:14 AM 07/05/12 10:14 AM
Joined: May 2003 Posts: 1,527 Michigan G GoDartGo OP pro stock
GoDartGo OP pro stock G Joined: May 2003 Posts: 1,527 Michigan	I believe that is on the base plate.

Re: Holley 750 ?? [Re: GoDartGo] #1262023 07/05/12 11:38 AM 07/05/12 11:38 AM
Joined: Aug 2007 Posts: 1,564 St. Clair Shores, Michigan bigsbigelow pro stock
bigsbigelow pro stock Joined: Aug 2007 Posts: 1,564 St. Clair Shores, Michigan	The vac port on the metering block is a "ported vacuum" source. It is where the Mopar brand vacuum advance distributors are supposed to be hooked to. Ryan "Bigs" '73 Duster (BLKDUST) - Black, 100% factory sheet metal, flat hood, 346 cid, J Heads, and a bench seat. http://s268.photobucket.com/albums/jj1/bigsbigelow/ Best to date: 12.40 @ 109 mph

Re: Holley 750 ?? [Re: bigsbigelow] #1262024 07/05/12 01:44 PM 07/05/12 01:44 PM
Joined: Aug 2003 Posts: 43,190 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,190 Bend,OR USA	Quote: The vac port on the metering block is a "ported vacuum" source. It is where the Mopar brand vacuum advance distributors are supposed to be hooked to. If you hook it up to a vacume port on the carb. that is using intake manifold vacume you will have full vacume advance at idle and loose it at WOT GM did that way for a short while in the 1950s on the V8 Chevys Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Holley 750 ?? [Re: Cab_Burge] #1262025 07/05/12 02:07 PM 07/05/12 02:07 PM
Joined: Jan 2003 Posts: 6,988 Warren, MI J Jerry master
Jerry master J Joined: Jan 2003 Posts: 6,988 Warren, MI	if you hook up to manifold vacuum that might not be a bad thing. mopar distributors are horribly over advanced from the factory anyway. you really want to get some lighter springs in there and if you hook up to manifold vacuum you will have your base advance plus canister advance giving you around 15-16 degrees which is good. the while driving you get your base advance plus your plate advance which would put it around 35 degrees Superior Design Concepts 2574 Elliott Dr Troy MI 48083 jerry@sdconcepts.com www.sdconcepts.com Facebook page: Superior Design Concepts www.bcrproducts.com

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