Author Topic: 302 Valve adjustment  (Read 11805 times)

bcmiller

  • CRG Member
  • *****
  • Posts: 4012
    • View Profile
Re: 302 Valve adjustment
« Reply #15 on: October 31, 2018, 02:48:08 PM »
Thanks everyone for the help. I readjusted the valves over the weekend and it now runs and sounds great. For some reason number 1 and number 4 valves were a little loose. I originally used the EOIC method when the engine was on the engine stand. This time I used the 90 degree method which I think is the best method to make sure the cam is on its base circle.

I chased this car for about 30 years which my ex father in law bought new at Harry Mann Chevrolet in Los Angeles (68 Z28 RS). Its been sitting for about 25 years and has 67000 original miles, original paint and interior, all #s matching and extremely well documented. He told me he used to adjust the valves with the engine running. He would use cardboard to deflect the oil to keep from making a mess.

Nice car!

Hot and running is how I was taught to adjust valve lash. :) 

Bryon / 1968 Camaro SS 396 coupe - now old school 468 big block
1967 Camaro RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016

X33RS

  • Hero Member
  • *****
  • Posts: 1092
    • View Profile
Re: 302 Valve adjustment
« Reply #16 on: October 31, 2018, 02:53:40 PM »
Thanks everyone for the help. I readjusted the valves over the weekend and it now runs and sounds great. For some reason number 1 and number 4 valves were a little loose. I originally used the EOIC method when the engine was on the engine stand. This time I used the 90 degree method which I think is the best method to make sure the cam is on its base circle.



Just as some of us were trying to explain, that was just the product of a few lobes not being exactly on the base circle and why the EOIC method isn't always accurate.   With the lobe designs of these cams, new and old, it's just best to make sure you're on base circle for lash settings.  Glad to hear it's running fine.  Great looking Z.

68 z28 RS

  • Newbie
  • *
  • Posts: 13
  • Original paint/interior survivor, 67,000 miles
    • View Profile
Re: 302 Valve adjustment
« Reply #17 on: October 31, 2018, 05:04:02 PM »
You were right X33RS, I learned a lesson from this.  :)


KurtS

  • CRG Coordinator
  • *****
  • Posts: 5884
    • View Profile
Re: 302 Valve adjustment
« Reply #18 on: November 02, 2018, 04:24:06 PM »
btw, it should be a chrome shifter ball since the pattern is already on the console. :)
Kurt S
CRG

68 z28 RS

  • Newbie
  • *
  • Posts: 13
  • Original paint/interior survivor, 67,000 miles
    • View Profile
Re: 302 Valve adjustment
« Reply #19 on: November 02, 2018, 08:49:26 PM »
Copy that KurtS, I already corrected that. It should also be a Muncie shifter, not a Hurst.
 

maroman

  • Hero Member
  • *****
  • Posts: 1067
    • View Profile
Re: 302 Valve adjustment
« Reply #20 on: November 02, 2018, 09:07:54 PM »
I'd leave the shifter.
Doug  '67 RS/SS 396 auto I know the car since new

Z10Mike

  • Member
  • ***
  • Posts: 123
    • View Profile
Re: 302 Valve adjustment
« Reply #21 on: November 02, 2018, 11:57:44 PM »
"I'd leave the shifter."
I'll second that.  I had a car in high school with an original Muncie shifter.  It was notorious for hanging up between gears when pushing the car hard.  A new competition plus from the local Ramchargers speed shop cured the problem. 

68 z28 RS

  • Newbie
  • *
  • Posts: 13
  • Original paint/interior survivor, 67,000 miles
    • View Profile
Re: 302 Valve adjustment
« Reply #22 on: November 03, 2018, 02:10:29 AM »
I agree Z10Mike,
I was considering modifying the stock Muncie shifter handle to work on the Hurst shifter so it looks original.

Kelley W King

  • Hero Member
  • *****
  • Posts: 1410
    • View Profile
Re: 302 Valve adjustment
« Reply #23 on: November 03, 2018, 01:06:09 PM »
I think they make a Muncie handle to bolt on the hurst. I have one on my 64 vette.
69 Z28 RS Scuncio Hi Performance
69 SS L78
67 SS Chevelle
64 Corvette
66 GTO Tiger Gold
77 Trans Am Special Edition

68 z28 RS

  • Newbie
  • *
  • Posts: 13
  • Original paint/interior survivor, 67,000 miles
    • View Profile
Re: 302 Valve adjustment
« Reply #24 on: November 03, 2018, 07:58:49 PM »
I will have to look into that Kelly.


maroman

  • Hero Member
  • *****
  • Posts: 1067
    • View Profile
Re: 302 Valve adjustment
« Reply #25 on: November 03, 2018, 10:39:21 PM »
I think I'm liking that car. Thanks for showing us.
Doug  '67 RS/SS 396 auto I know the car since new

68 z28 RS

  • Newbie
  • *
  • Posts: 13
  • Original paint/interior survivor, 67,000 miles
    • View Profile
Re: 302 Valve adjustment
« Reply #26 on: November 04, 2018, 12:57:05 AM »
Thanks maroman :)

firstgenaddict

  • Hero Member
  • *****
  • Posts: 2882
  • caretaker of 1971 LT1's 11130 & 21783
    • View Profile
    • Groome Family Automobiles
Re: 302 Valve adjustment
« Reply #27 on: December 29, 2018, 11:40:35 PM »
If I am not mistaken Duke and John have an updated lash spec.
James
Collectin' Camaro's since "Only Rednecks drove them"
Current caretaker of 1971 LT1's - 11130 and 21783 Check out the Black 69 RS/Z28 45k mile Survivor and the Lemans Blue 69 Z 10D frame off...
https://plus.google.com/photos/112392262205377424364/albums?banner=pwa

68 z28 RS

  • Newbie
  • *
  • Posts: 13
  • Original paint/interior survivor, 67,000 miles
    • View Profile
Re: 302 Valve adjustment
« Reply #28 on: December 31, 2018, 03:30:37 AM »
Thanks firstgenaddict, I will have to look that up. Do you know what they changed it to?

BULLITT65

  • Hero Member
  • *****
  • Posts: 4476
    • View Profile
Re: 302 Valve adjustment
« Reply #29 on: December 31, 2018, 05:52:05 PM »
Very nice 68Z. Maybe we can convince you to submit the history of the car, and your story to Bryon.
(I would love to read more about it, and see more pics)
1969 garnet red Z/28 46k mile unrestored X77
-Looking for 3192477 (front) spiral shocks 3192851 (rear)
-Looking for an original LOF soft ray windshield
-Looking for original Delco side post negative battery cable part # 6297651AV