6066 (1960-1966) GMC Truck Club Bitcoin now accepted here! 
Pay Dues
Pay Dues or become a Site Supporter
 



Go Back   6066 (1960-1966) GMC Truck Club > 6066 GMC Truck Club Forum > GMC V6 and V12 Engines


GMC V6 and V12 Engines Engine repair and rebuilding

Reply
 
Thread Tools
  #11  
Old July 1st, 2016, 03:36 PM
TJ's GMC's Avatar
TJ's GMC TJ's GMC is offline
Senior Member
 
Join Date: Mar 2015
Location: Cave Junction, Oregon
Truck: 1964 GMC 1500 LWB Wideside 305E V6.
Posts: 1,317
Rep Power: 359
TJ's GMC will become famous soon enough
Default Re: HEI Conversion

Quote:
Originally Posted by archie View Post


This is from online from the guy who I purchased it from. I will post some more
Very nice truck!
__________________
"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

1964 Chevy C20 292/SM420
1966 Chevy C10 292 hotrod 6/TKO600


My youtube channel aka Military Chevy:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #12  
Old July 13th, 2016, 05:25 PM
fredmill fredmill is offline
Junior Member
 
Join Date: Jul 2016
Location: columbus. ohio
Truck: I don't own one - YET!
Age: 28
Posts: 1
Rep Power: 0
fredmill is on a distinguished road
Default Re: HEI Conversion

Awesome car!
Reply With Quote
  #13  
Old July 14th, 2016, 03:27 PM
TJ's GMC's Avatar
TJ's GMC TJ's GMC is offline
Senior Member
 
Join Date: Mar 2015
Location: Cave Junction, Oregon
Truck: 1964 GMC 1500 LWB Wideside 305E V6.
Posts: 1,317
Rep Power: 359
TJ's GMC will become famous soon enough
Default Re: HEI Conversion

Any updates on this?
__________________
"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

1964 Chevy C20 292/SM420
1966 Chevy C10 292 hotrod 6/TKO600


My youtube channel aka Military Chevy:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #14  
Old November 27th, 2018, 08:10 AM
Glenn Glenn is offline
Junior Member
 
Join Date: Nov 2018
Location: Morton, WA
Truck: 1971 c7500
Posts: 5
Rep Power: 0
Glenn is on a distinguished road
Default Re: HEI Conversion

Right in the middle of a Buick conversion.

78 Buick Even fire v6 HEI distributor. Cap has 6 towers not 8 with 2 plugged. cap with 8 towers with 2 plugged is for a odd fire V6.

Old distributor is on the bench with drive gear removed. Sleeve is in the lathe about 50% finished, Rockauto has complete distributor for under $100 delivered,
it should be here tomorrow.
Reply With Quote
  #15  
Old November 28th, 2018, 04:39 AM
WE7X WE7X is offline
Member
 
Join Date: Sep 2013
Location: Issaquah, Washington
Truck: 1970 GMC RM-7500 Motorhome
Posts: 56
Rep Power: 49
WE7X is on a distinguished road
Default Re: HEI Conversion

Glenn, in Morton, WA
I would love to see a picture of your C7500.
Mine is an RM 7500 with the 401Mand 5x2 driveling setup.
Rod Johnson
Issaquah, WA.

Last edited by WE7X; November 28th, 2018 at 04:40 AM. Reason: forgot something
Reply With Quote
  #16  
Old November 29th, 2018, 03:49 AM
Glenn Glenn is offline
Junior Member
 
Join Date: Nov 2018
Location: Morton, WA
Truck: 1971 c7500
Posts: 5
Rep Power: 0
Glenn is on a distinguished road
Default Re: HEI Conversion

Hello Rod,

Will see if I can get a good picture when the weather clears.

Buick distributor is in and running, great mod. It was static timed and fired up as soon as I turned the key. Used to have to choke it fully and pump the gas peddle, but not this time, 1/2 choke and it was running before I got a chance to hit the peddle. When I got the light on it I was only off by a few degrees, static put it at 11 degrees and I run it at 8 to 8.5 degrees.

Mod was easy, but during the study time a important detail showed up I had not read about. This might help someone who finds the mod not working as described in the other writings.

GM's small block (which includes the Buick even fire V6) has a interesting difference as compared to GMC's big block V6.

The GM distributor uses up-thrust to position the star wheel correctly to the pickup. This is controlled by the thrust washer you will find between the top of the drive gear and the bottom of the distributor housing on the Buick factory distributor.

Now the cam for the points in the GMC big block V6 is positioned so the rubbing block of the points rides in the center of the cam by down-thrust, which pushes the distributor drive gear down against the engine block. You will notice that there is a flange on the bottom of the distributor drive gear you should also notice that the bottom of the drive gear is polished like a mirror when you remove the distributor.

Now if you will take the new Buick distributor remove the cap and rotor push up on the gear and while doing this inspect the star wheel and the pickup pole pieces you will see how the distributor manufacturer aligned the star wheel to the pole pieces. Remember what you see, we will come back to this in a minute.

Question is how to convert the Buick distributor from up-thrust to work in a GMC big block down-thrust application? Answer not a big problem it just takes a little fussing around.

By now you should have noticed that the old points distributor has a huge amount of shaft end play.

Things that you should also pay attention to, watch the oil pump drive rod depth in the gear, the Buick shaft may be a little to long and reduce the depth of the drive recess when the gear is correctly installed.

So, now you have the drive gears off the old and new distributors. Throw away the Buick drive gear, thrust washer, and roll pin.

The GMC drive gear should be a nice slip fit onto the Buick distributor.

This needs to be turned into a light drive fit. Take a center punch and raise a few burrs around the shaft where the gear is going to end up (the space between the top of the old gear and the bottom of the new distributor housing will be a little less than 3/16 in.) Start the gear onto the shaft and rotate where you want it in regards to the flattened end of the shaft, then drive it on until there is about a 3/16 in. gap between the top of the gear and the bottom of the housing. Now take it to the engine and install it (Use the hold down clamp). Now don't worry about timing, just get engaged in the cam gear and oil pump drive. Remember the relationship between the star wheel and pickup? Hope so, as this is where we come back to it.

Inspect the star wheel and pickup pole pieces, the star wheel should be standing tall! Now use a 3/8 drive socket to protect the top of the distributor shaft and a small hammer and tap the shaft into the gear until the star wheel is where it belongs in relationship to the pickup pole pieces.

Carefully remove the distributor from the engine (not moving the shaft and gear setting) and drill a hole through the old gear and new Buick shaft and install a new roll pin, use red lock tite on the roll pin.

You have now converted a up-thrust distributor to a down-thrust distributor. When installed and timed the star wheel and pole pieces will line up just like they did in the Buick engine.

Glenn
Reply With Quote
  #17  
Old November 29th, 2018, 11:52 PM
LEWISMATKIN's Avatar
LEWISMATKIN LEWISMATKIN is offline
-= Site Supporter =-
 
Join Date: Jan 2013
Location: RIDGE MANOR, FLORIDA
Truck: 1965 1002 GMC V6-305E
Age: 59
Posts: 98
Rep Power: 66
LEWISMATKIN is on a distinguished road
Default Re: HEI Conversion

Hello gang! The old Jolly website has the info you are looking for on the Buick V6 distributor. Ed Erlbacher did a great job engineering the sleeve you are talking about. Hope this is of some help.
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #18  
Old January 5th, 2019, 02:03 PM
tommr tommr is offline
Member
 
Join Date: May 2013
Location: phila pa
Truck: 1947 Flxible Clipper Bus 29 passenger 401 M
Posts: 76
Rep Power: 56
tommr is on a distinguished road
Default Re: HEI Conversion

You can also contact Davessmallbodyheis.com. Hes doing a conversion of my original distributor for a GM TBI conversion on a 401M. There are multiple options. Very knowledgeable guy and good communication. Pull up his Gallery page. http://www.davessmallbodyheis.com
Reply With Quote
Reply

Bookmarks

Tags
hei

Thread Tools

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
hei conversion Archiver Previous Forum Posts 0 April 27th, 2007 01:08 AM
HEI Conversion Archiver Previous Forum Posts 0 April 19th, 2006 01:27 AM
HEI Conversion Archiver Previous Forum Posts 0 April 13th, 2006 01:51 AM
HEI conversion Archiver Previous Forum Posts 0 January 18th, 2006 12:19 AM
HEI conversion Archiver Previous Forum Posts 0 April 15th, 2005 02:28 PM


All times are GMT +1. The time now is 03:14 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2013, Jelsoft Enterprises Ltd 117|0
Feedback Buttons provided by Advanced Post Thanks / Like (Lite) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.