Pontiac 389 with HEI - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum

Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 03-27-2007, 07:39 PM
Registered User
Join Date: Dec 2005
Location: Burlington, IA
Posts: 21
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Pontiac 389 with HEI

I'm in the process of building up a '65 Pontiac 389 engine and plan on using a Summit HEI distributor. The plugs that were in the engine when I got it were AC R45S. According to my Chilton Manual, they went to HEI in '75 and used R46TSX or R45TSX plugs gapped at .060. Is this what I want to use taking today's gas into consideration and the fact that I plan on staying at the stock compression ratio of 10.5 to 1. Any info would be appreciated.

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 03-27-2007, 11:25 PM
11echo's Avatar
Old Guys Rule!...EVERYTHING!
Last photo:
Join Date: Jun 2003
Location: Bakersfield, CA
Age: 66
Posts: 467
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
kreuzn1 ...I LOVE Pontiac 389's!!! My first engine I rebuilt MANY moons ago (never mind how many!)!! ...Ok, when you change a regular distributor out in favor of a HEI you need to do two things. One - remove the resistor wire that protects the old points system. This knocks the voltage down to the points when the engine is running to protect the points from burning. IT normally knocks it down to about 9 volts. ...You'll need all 12V to operate the HEI correctly (it wil run on the 9Vs but the HEI system is looking for 12Vs). Second - is the spark plugs. Use the original plugs called for on that engine ...BUT you need to change the gap from the original 0.035" to 0.045" ...then watch the color of the plugs so they don't run too hot. This can lead to major problems if not caught. Good Luck!

PS ...When you have problems with the rocker arms studs pulling, drop me a line! *G* ...Mark(11echo)
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 03-29-2007, 06:27 AM
Registered User
Join Date: Dec 2005
Location: Burlington, IA
Posts: 21
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks for the info. I asked the guy who runs the local engine rebuild shop the same question and he told me the identical thing. kreuzn1.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
pontiac 389 or 400 Rufus_2 Engine 3 04-01-2006 03:39 AM
63 pontiac 389 1967bird Introduce Yourself 1 11-22-2004 06:53 PM
pontiac 389 broken rocker stud tree_entz Engine 4 06-08-2004 12:29 PM
69 Pontiac Firebird HEI Distributor Question pontiac69 Engine 13 12-01-2003 08:35 PM
pontiac HEI issues Jared Engine 4 04-17-2003 12:15 PM

All times are GMT -6. The time now is 11:19 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.