3917291 Heads - Team Camaro Tech
Engine General Engine Discussion.

LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old Sep 5th, 16, 04:55 PM Thread Starter
Senior Tech
Join Date: Jan 2010
Location: 44065
Posts: 215
3917291 Heads

I have a pair of 3917291 2.02/1.60 original GM heads. One is dated C/22/8
and came of a 68 z/28 302. The other one is dated I/13/8 and came from a 327 HO motor. They have been sitting around for quite some time and I just recently removed the rockers along with the rocker ball and nut and put them in a cleaning solution. I didn't pay much attention to what I was doing because both heads used 1.5 rockers, however the z/28 head had 'O' rockers and the other head just regular rockers. As I was cleaning the parts I noticed that I had 8 rocker balls of one thickness and 8 of another thickness. I don't think it makes much of a difference but when I put them back on the heads, I would like to put the correct 'balls' with the corresponding rockers. Do the thinner rockers go with the 'O' rockers or the regular rockers or visa versa.

pjbizjak is offline  
Sponsored Links
post #2 of 3 (permalink) Old Sep 5th, 16, 06:56 PM
Gold Lifetime Member
Join Date: Jan 2005
Location: 2 Dog Town in West Texas
Posts: 11,154
Re: 3917291 Heads

Not supposed to mix rocker arm and pivot balls , after they have been burned in. Its a pattern thing.
Need to pair them for he next user.

TC # 349
Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
zdld17 is offline  
post #3 of 3 (permalink) Old Sep 6th, 16, 11:22 AM
Gold Lifetime Member
wwallman's Avatar
Join Date: Jun 2016
Location: Sonoma,Ca
Posts: 146
Re: 3917291 Heads

Pete: Too late now to worry about trying to figure out which rocker arm went with which pivot ball. Don is 100% correct about the balls and rockers wearing in together. If you want to stay with the factory configuration order a new set of rockers and balls. If you by chance have screw in vs. pressed in rocker arm studs go the extra mile and go with a good set of roller rockers. Much more efficient as the motion is supported by needle bearings vs. stock rockers sliding metal to metal sections. As an added benefit you will pick up a few horsepower with a switch to roller rockers. Best of luck.

Detective Lt. Will, Chief of Homicide/ Chief Deputy Coroner: RETIRED AFTER 32 years.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

67 Camaro RS /327 -275 hp
Powerglide to 2:73 rear gears
Black vinyl over Ermine White
30,000 documented mile survivor
Second owner. P.O.P car.
wwallman is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user 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.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

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