Another HEI Question??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

HotRod929 · 08-29-2002, 04:02 PM

When I get a HEI distrobuter do I want a mechanical advance unite or a vacuum advance unit? What all is the difference between the two?

HotRod

Blazer1970 · 08-29-2002, 04:28 PM

The HEI that you want has both vacuum and mechanical advance. The ones for computer controlled vehicles do not have the vacuum advance.

Stroker · 08-29-2002, 04:31 PM

You want both unless your using as race only. The dizzys that are advertised with vacuum advance also have the mechanical.

08-29-2002, 04:02 PM	#1
HotRod929 Registered User Join Date: Mar 2002 Location: Bondurant, IA but in Worcester, MA for school Posts: 767	Another HEI Question??? When I get a HEI distrobuter do I want a mechanical advance unite or a vacuum advance unit? What all is the difference between the two? HotRod __________________ 1970 Chevy C-20 350 V-8 Turbo 350 w/ shift kit Dana 60 w/ 4.10 gears AND Powr-Loc POSI New Additions: Summit Headers 135amp alternator Proform HEI Edelbrock 1406 600cfm carb Sunpro Tach Powr-Loc POSI Edelbrock Performer RPM Intake MSD 6A Ignition Box AIM: HotRod929 Visit My Site: http://1970chevy.netfirms.com/

08-29-2002, 04:28 PM	#2
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,507	The HEI that you want has both vacuum and mechanical advance. The ones for computer controlled vehicles do not have the vacuum advance. __________________ Tim

08-29-2002, 04:31 PM	#3
Stroker Registered User Join Date: Mar 2001 Location: Moore, Ok Posts: 1,149	You want both unless your using as race only. The dizzys that are advertised with vacuum advance also have the mechanical. __________________ 72 SWB parts and pieces Oklahoma

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