Vacuum Adv. Dizzy question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bikerbomber · 06-05-2009, 06:23 PM

Hey Guys, I was looking at a dizzy I found to soon replace my troublesome one and I found an fairly nice one but I won't lie I don't think it will work. Its an HEI dizzy with a vacuum advance. Is there a way to cap off the vacuum adv. My ecm does the timing changes for me ....or is this something I can incorporate into my existing system?

I have a 88 4.3 TBI c1500

If this is a silly question I'm sorry but I figure the dumb one is the one not asked, thanks!

ChevLoRay · 06-06-2009, 11:27 AM

It's a good question. Hopefully, someone will answer it for you. I don't have a clue.

bikerbomber · 06-06-2009, 12:13 PM

Hmmm, thanks for telling me something. Haha. I ask questions and when I get nothing back, I think its something everyone is saying, "He doesn't know THAT?"

I'm going to look into it. Thanks

**bwood** · 06-06-2009, 04:34 PM

I don't think it will work as the modules would be different. When you say HEI w/ vac adv, I assume you mean the previous style found in pre 87 truck with the coil in the cap. You can get a reman dist from the parts stores for $100-$150 with LT Warr.

bikerbomber · 06-07-2009, 07:50 PM

Yeah, I was thinking about those. (The coil on top ones)

It was my understanding they create a stronger spark than stock.

Anyone put those on their 88-96? Thanks

**bwood** · 06-07-2009, 10:15 PM

You can get an aftermarket coil if you want more spark.

bikerbomber · 06-07-2009, 10:35 PM

If I upgrade the coil, will I need to do anything to the dizzy?

ChevLoRay · 06-08-2009, 11:24 AM

I would hope that your distributor cap and the rotor are in good condition. If they aren't, I'd be replacing them when I installed the new coil.

You don't want all that additional voltage tracking across a pre-existing carbon track and nullifying your effort and expense.

**bwood** · 06-08-2009, 11:00 PM

No, just install a quality cap, rotor, wires and plugs to take full advantage of the coil. Check out this stuff from Accel.

Accel Dist.
http://www.accel-ignition.com/Produc...minselection=1

Accel Coil
http://www.accel-ignition.com/Produc...minselection=1

Or stick with the stock dist and get the Accel Tune Up kit
http://www.accel-ignition.com/Produc...minselection=0

You can ge this stuff from Oreilly Auto, Summit Racing, Jegs

**bwood** · 06-08-2009, 11:09 PM

Or MSD

Dist
http://www.msdignition.com/product.aspx?id=5367

Coil
http://www.msdignition.com/product.aspx?id=5063

Wires
http://www.msdignition.com/product.aspx?id=6041
It says 92-97 but I searched your engine and this is what came up.

As far as plugs go, I have always like the AC Delco Rapidfire Plugs on the TBI engines. I found Autozone to actually be cheaper on the MSD stuff and they keep the coil and wires in stock at my local store.

06-05-2009, 06:23 PM	#1
bikerbomber Registered User Join Date: Feb 2007 Location: Sierra Vista, AZ Posts: 306	Vacuum Adv. Dizzy question Hey Guys, I was looking at a dizzy I found to soon replace my troublesome one and I found an fairly nice one but I won't lie I don't think it will work. Its an HEI dizzy with a vacuum advance. Is there a way to cap off the vacuum adv. My ecm does the timing changes for me ....or is this something I can incorporate into my existing system? I have a 88 4.3 TBI c1500 If this is a silly question I'm sorry but I figure the dumb one is the one not asked, thanks! __________________ If all men are created Equal* does that mean we are all artifical?

06-06-2009, 11:27 AM	#2
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: Vacuum Adv. Dizzy question It's a good question. Hopefully, someone will answer it for you. I don't have a clue. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

06-06-2009, 12:13 PM	#3
bikerbomber Registered User Join Date: Feb 2007 Location: Sierra Vista, AZ Posts: 306	Re: Vacuum Adv. Dizzy question Hmmm, thanks for telling me something. Haha. I ask questions and when I get nothing back, I think its something everyone is saying, "He doesn't know THAT?" I'm going to look into it. Thanks __________________ If all men are created Equal* does that mean we are all artifical?

06-06-2009, 04:34 PM	#4
bwood Registered User Join Date: Jan 2003 Location: Denison, Texas Posts: 1,920	Re: Vacuum Adv. Dizzy question I don't think it will work as the modules would be different. When you say HEI w/ vac adv, I assume you mean the previous style found in pre 87 truck with the coil in the cap. You can get a reman dist from the parts stores for $100-$150 with LT Warr. __________________ 2013 Ford F150 FX4 2006 Chevy Silverado 1500 1982 Chevy C1500 2020 Ford Explorer Limited 2008 Ford Escape

06-07-2009, 07:50 PM	#5
bikerbomber Registered User Join Date: Feb 2007 Location: Sierra Vista, AZ Posts: 306	Re: Vacuum Adv. Dizzy question Yeah, I was thinking about those. (The coil on top ones) It was my understanding they create a stronger spark than stock. Anyone put those on their 88-96? Thanks __________________ If all men are created Equal* does that mean we are all artifical?

06-07-2009, 10:15 PM	#6
bwood Registered User Join Date: Jan 2003 Location: Denison, Texas Posts: 1,920	Re: Vacuum Adv. Dizzy question You can get an aftermarket coil if you want more spark. __________________ 2013 Ford F150 FX4 2006 Chevy Silverado 1500 1982 Chevy C1500 2020 Ford Explorer Limited 2008 Ford Escape

06-07-2009, 10:35 PM	#7
bikerbomber Registered User Join Date: Feb 2007 Location: Sierra Vista, AZ Posts: 306	Re: Vacuum Adv. Dizzy question If I upgrade the coil, will I need to do anything to the dizzy? __________________ If all men are created Equal* does that mean we are all artifical?

06-08-2009, 11:24 AM	#8
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: Vacuum Adv. Dizzy question I would hope that your distributor cap and the rotor are in good condition. If they aren't, I'd be replacing them when I installed the new coil. You don't want all that additional voltage tracking across a pre-existing carbon track and nullifying your effort and expense. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

06-08-2009, 11:00 PM	#9
bwood Registered User Join Date: Jan 2003 Location: Denison, Texas Posts: 1,920	Re: Vacuum Adv. Dizzy question No, just install a quality cap, rotor, wires and plugs to take full advantage of the coil. Check out this stuff from Accel. Accel Dist. http://www.accel-ignition.com/Produc...minselection=1 Accel Coil http://www.accel-ignition.com/Produc...minselection=1 Or stick with the stock dist and get the Accel Tune Up kit http://www.accel-ignition.com/Produc...minselection=0 You can ge this stuff from Oreilly Auto, Summit Racing, Jegs __________________ 2013 Ford F150 FX4 2006 Chevy Silverado 1500 1982 Chevy C1500 2020 Ford Explorer Limited 2008 Ford Escape Last edited by bwood; 06-08-2009 at 11:04 PM.

06-08-2009, 11:09 PM	#10
bwood Registered User Join Date: Jan 2003 Location: Denison, Texas Posts: 1,920	Re: Vacuum Adv. Dizzy question Or MSD Dist http://www.msdignition.com/product.aspx?id=5367 Coil http://www.msdignition.com/product.aspx?id=5063 Wires http://www.msdignition.com/product.aspx?id=6041 It says 92-97 but I searched your engine and this is what came up. As far as plugs go, I have always like the AC Delco Rapidfire Plugs on the TBI engines. I found Autozone to actually be cheaper on the MSD stuff and they keep the coil and wires in stock at my local store. __________________ 2013 Ford F150 FX4 2006 Chevy Silverado 1500 1982 Chevy C1500 2020 Ford Explorer Limited 2008 Ford Escape



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