The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 12-15-2009, 04:30 PM   #1
BluTrukker
BOHICA
 
BluTrukker's Avatar
 
Join Date: Mar 2008
Location: Stewartville, MN
Posts: 440
HEI question

I have 2 used HEI's that I can to upgrade my truck. I am not all that familiar with them, and need some advice. They are both out of mid 80's trucks. One is off a big block and one off a small block. I haven't closely inspected either one yet, they are laying on a shelf at my buddies place and he told me I can have whatever one I want. One has a vacuum advance and one doesn't. Whats the deal with that? I thought all the older stuff had vacuum advance? Is there a benefit to using one over the other? I am putting it on a 307, so I'm only looking for reliable cruising not power.
__________________
Trying to save someone from their own stupidity is like teaching a pig to dance. It is a waste of your time, and it annoys the pig!

Last edited by BluTrukker; 12-15-2009 at 04:31 PM.
BluTrukker is offline   Reply With Quote
Old 12-15-2009, 04:57 PM   #2
68gmsee
Active Member
 
68gmsee's Avatar
 
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
Re: HEI question

I'd get the one with the vacuum advance. If you're not familiar with the HEI there is tons of stuff on the net to help you. Also, educate yourself on what the mechanical and vacuum advance does and how it's adjusted.

Here's a good site that you can look at but there are others just as good or better: http://rmcavoy.freeshell.org/HEI.html
68gmsee is offline   Reply With Quote
Old 12-15-2009, 05:05 PM   #3
71meangreenc10
Its a Truck Thing......
 
71meangreenc10's Avatar
 
Join Date: Dec 2004
Location: Sierra Vista, Arizona
Posts: 2,897
Re: HEI question

Replace the vacuum advance with one that is an adjustable VA, makes a big difference.

Smitty
__________________
71 C10 283/3SPD Full Resto
71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599
70 Suburban Former military GSA truck.
72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber...Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378
72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one.....Gen 5 5.3/6L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110
68 Suburban was 3/4 ton, now 1/2....Wife shook her head...
71 C30 Wrecker....Cooter never had it this good...Wife actually smiled...
72 C20 Blue Beard....Its a Builder
71 C20 Scott-Bilt As weird as it gets..BB AC Truck
68 GMC Long Stepside....They keep following me home...
71meangreenc10 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 08:48 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com