help choosing mild cam for 389 - Pontiac GTO Forum
User Tag List

 
LinkBack Thread Tools Display Modes
post #1 of 9 (permalink) Old 05-10-2012, 03:01 PM Thread Starter
 
Join Date: May 2012
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
help choosing mild cam for 389

Hey all, I have a 66 389 thats getting a refresh for my 66 Gto (tho not a Gto engine.)
Want a mild cam to put in there, gain a little power, better sounding, with more of a lope to it.

Anyone have any suggestions they have seen in these engines?

Thanks
-Steve-
Asuryan9 is offline  
Sponsored Links
Advertisement
 
post #2 of 9 (permalink) Old 05-10-2012, 03:38 PM
 
rickm's Avatar
 
Join Date: Feb 2012
Location: new york state
Posts: 633
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
g.m. part # 9779068 is a nice cam for your motor. i put one in my '65 389 YF (bonneville motor) its got plenty of balls with the stock carter afb and has a nice idle. this cam has powered many pontiac performance engines. rickm.
rickm is offline  
post #3 of 9 (permalink) Old 05-10-2012, 06:20 PM
64-67 Expert
 
geeteeohguy's Avatar
 
Join Date: Feb 2008
Location: Fresno, California
Posts: 8,480
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 100 Post(s)
I agree with Rickm. If you're running stock heads and pistons, the 068 is hard to beat. Plenty of power all through the rpm range and a strong runner. Not much lope, though....lope is over rated (just means there is too much valve-opening at idle speeds to be efficient...= rich exhaust (fuel waste), accelerated engine wear, and contaminated engine oil.
geeteeohguy is online now  
 
post #4 of 9 (permalink) Old 05-10-2012, 08:26 PM
 
Join Date: Sep 2011
Location: west mich ... Grand Rapids Area
Posts: 95
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I went with a comp cams in my 400, they have a mild cam designed for improved economy and performance. The grind was xe250h, search you-tube videos for some pontiacs with this cam. I would email some of the cam company's with your setup and get their input. Don't forget zddp additive in your oil if you run a flat tappet style cam. The old cams are pretty good, I personally believe the new stuff they model and mass produce has an edge though......
fasterfiero is offline  
post #5 of 9 (permalink) Old 05-10-2012, 08:43 PM
 
facn8me's Avatar
 
Join Date: Jul 2011
Location: Tulsa, Ok
Posts: 574
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
I am runing the summit 2801. Almost an exact copy of the pontiac 068 cam Very smooth idle. Nice chop out the exhaust though. I have no complaints. Unless you beef up the bottom end it's done by 5200 rpm. No reason to have a cam that works much above that anyway as these things are torque monsters. 360hp 420ftlbs is what the factory 1966 389 tri power was rated at.

https://www.gtoforum.com/signaturepics/sigpic18842_1.gif

1966 Pontiac Lemans Convertible
389 tri power
facn8me is offline  
post #6 of 9 (permalink) Old 05-11-2012, 09:11 AM
64-67 Expert
 
geeteeohguy's Avatar
 
Join Date: Feb 2008
Location: Fresno, California
Posts: 8,480
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 100 Post(s)
My '65 has a nasty, super-lopey Sig Erson single profile cam in it that I installed when I built the engine in '81. Sounds mean. Stings your eyes at idle, and shakes the whole car. It does, however, work very well in that 389. Good power from 1500 until blow-up range...at least until valve float. I loved it when I was 20 years old. Not so much, now. The motor has 50k on it now, and still runs great with no leaks, which is pretty amazing. If I ever pull it out to reseal it, I'll probably change the cam and heads....Just saying, the thought of a "mean lope" or a "Loud exhaust" is attractive, but the reality of driving it every day can become tiresome...Camshafts and exhaust systems in the "sensible" range seem to work very well for every occasion.
geeteeohguy is online now  
post #7 of 9 (permalink) Old 05-11-2012, 03:56 PM
 
Join Date: Mar 2011
Location: Texas
Posts: 704
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
lope and mild do not mix.
pontiac is offline  
post #8 of 9 (permalink) Old 05-13-2012, 12:32 PM
 
tiger13's Avatar
 
Join Date: May 2012
Location: NC
Posts: 85
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You wouldn't happen to have the numbers to that cam would you? and would it work in a 400? I am putting together something that it would sound perfect for. not so much as a daily driver but a display type car.
tiger13 is offline  
post #9 of 9 (permalink) Old 05-14-2012, 11:52 AM
64-67 Expert
 
geeteeohguy's Avatar
 
Join Date: Feb 2008
Location: Fresno, California
Posts: 8,480
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 100 Post(s)
It's a Sig Erson HI-Flo 1. Hydraulic tappet, single profile. It has a LOT of duration and is suitable only for a stick shift car with 3 series gears on up. (12" vacuum at idle). There are much better camshafts out there today.
geeteeohguy is online now  
Sponsored Links
Advertisement
 
Reply

  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, LeMans & GTO Engine Tuning and High Performance

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pontiac GTO Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Help choosing a camshaft Othman Marafie Engine Discussions 14 07-24-2011 10:25 PM
Help Choosing Car gf7pe 2004-2006 GTO General Discussion 24 09-29-2009 08:28 PM
Mild daily driver set-up Ladimer 2004-2006 GTO General Discussion 2 12-10-2008 05:39 PM
Revived GTO mild on styling, hot going down road! 05GTO In the News 14 07-19-2005 06:37 AM
Hello all...newbie here. Need help choosing between '04 and '05 Eman Yenohp 2004-2006 GTO General Discussion 26 05-11-2005 05:24 PM

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

 
For the best viewing experience please update your browser to Google Chrome