1968 Stock 327 Pushrod Length - Team Camaro Tech
Engine General Engine Discussion.

 
LinkBack Thread Tools Display Modes
post #1 of 12 (permalink) Old Apr 8th, 11, 12:26 PM Thread Starter
Tech Team
Patrick
 
Join Date: Oct 2006
Location: Elizabeth, Colorado
Posts: 37
1968 Stock 327 Pushrod Length

Hey guys - I recently installed the Edelbrock Performer E-tec 170 top end kit on my original 327. This was an original 210HP version with a 2 barrel.

Anyway, Edelbrock suggests a 1.5 roller rocker and stock size pushrods (7.191). This said, I ordered Summit 1.5 roller rockers and 7.191 pushrods because that's what size Edelbrock said came stock. I found out during brake-in that something was definitely wrong because I heard a chatter shortly after and shut it down to find out that I had two of the rockers back out and come off the stud. I found out that I didn't tightem the polylockas properly. Apparently you're suppossed to adjust them, back them off a quarter turn and then lock them and retighten back from the quarter turn. This may have been most of my problem but also am finding that 7.191 was not the stock size and that 7.8 is.

Does anyone know what the correct stock pushrod length is?
pbranen is offline  
Sponsored Links
Advertisement
 
post #2 of 12 (permalink) Old Apr 8th, 11, 01:53 PM
Gold Lifetime Member
Bryon
 
bcm66's Avatar
 
Join Date: Apr 2006
Location: Nebraska
Posts: 4,661
Re: 1968 Stock 327 Pushrod Length

It is roughtly 7.800". See this link http://www.manleyperformance.com/pdf...lSys-77-86.pdf

I have also seen the numbers 7.724" and 7.794" used, which is close.

I think 7.191" is for the newer factory roller cam design.

I would call Edelbrock and explain what happened. Sounds like they told you wrong.

68 Camaro SS 396 - 468 BBC now, M21, 12 bolt 3.73 coded housing but w/ 3.31 gears.
Looking for 68 Camaro with body number NOR 181016
CRG -
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Last edited by bcm66; Apr 8th, 11 at 06:41 PM.
bcm66 is offline  
post #3 of 12 (permalink) Old Apr 8th, 11, 01:58 PM
Gold Lifetime Member
John
 
Vintage 68's Avatar
 
Join Date: Mar 2002
Location: Moraga,Ca.,USA
Posts: 13,705
Wink Re: 1968 Stock 327 Pushrod Length

"Stock" (pre GM Roller) = 7.794"

'Stock' GM Roller = 7.164"

1968 Convertible
Some trucks
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Other V8 things - some of which float
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Other V6 things - none of which float
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Oh yeah, and 1 "Straight-Six" ...
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


If a man says something in the garage - and his wife can't hear him - is he still wrong !!!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Vintage 68 is offline  
 
post #4 of 12 (permalink) Old Apr 8th, 11, 02:05 PM
Moderator
____
 
DOUG G's Avatar
 
Join Date: Mar 1999
Location: Maryland, USA
Posts: 19,441
Garage
Send a message via MSN to DOUG G
Re: 1968 Stock 327 Pushrod Length

Do not rely on the numbers.
Machined blocks,machined heads,aftermarket stuff,gasket thickness,lifters used,rockers used, all play a part in the correct length. Measure... then order what you need

68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
DOUG G is offline  
post #5 of 12 (permalink) Old Apr 9th, 11, 03:55 AM
Senior Tech
darrell
 
Join Date: Feb 2011
Location: texas
Posts: 1,202
Re: 1968 Stock 327 Pushrod Length

they are right -always check for proper length-clean the valve stem -smear a light coat of grease over stem and re-install rocker to zero lash and roll over motor -inspect location on stem -roller marks should be in center of stem --push rod too short, the marks will be on top side of stem
97Z4C is offline  
post #6 of 12 (permalink) Old Apr 9th, 11, 05:35 AM
Senior Tech
Mike
 
Join Date: Aug 2008
Location: Newark Delaware
Posts: 590
Garage
Re: 1968 Stock 327 Pushrod Length

Quote:
Originally Posted by DOUG G View Post
Do not rely on the numbers.
Machined blocks,machined heads,aftermarket stuff,gasket thickness,lifters used,rockers used, all play a part in the correct length. Measure... then order what you need
X2 always measure


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


67 RS 355sbc 11.76et @ 116mph 1.67 60' Deluxe Parchment interior
Bad67355 is offline  
post #7 of 12 (permalink) Old Apr 9th, 11, 11:13 AM
Gold Lifetime Member
John
 
Vintage 68's Avatar
 
Join Date: Mar 2002
Location: Moraga,Ca.,USA
Posts: 13,705
Wink Re: 1968 Stock 327 Pushrod Length

Guys - this isn't the "Performance" forum

He's obviously not going for a all-out street HP build here, just trying to get a little bit more out of a 'stock' 327/210!
He's not 'Zero-Decking' for max compression, angle milling the heads to reduce chamber cc (or even fitting the latest trick head confiquration needing custom pushrod lengths), changing Rocker ratios and other common mods required for a max efficiency HP build ... so matching pushrod length to lever is just not necessary at this point

I also read into the post he's not as mechanically inclinded as some and needed a base number to get his engine back operating correctly so he can enjoy his modifications to date ...

Lets get the correct 'stock' pushrods back in there, get the valve train adjusted correctly for his performance level and go from there.
If he posts back he's ready to move on to the next level, I'll be among the first to explain optimizing the ratio, centering the rocker contact and getting the system adjusted correctly
As I have in many other posts where the OP asked for that level of information ...

As always JMHO

1968 Convertible
Some trucks
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Other V8 things - some of which float
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Other V6 things - none of which float
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Oh yeah, and 1 "Straight-Six" ...
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


If a man says something in the garage - and his wife can't hear him - is he still wrong !!!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Vintage 68 is offline  
post #8 of 12 (permalink) Old Apr 9th, 11, 01:46 PM
Moderator
____
 
DOUG G's Avatar
 
Join Date: Mar 1999
Location: Maryland, USA
Posts: 19,441
Garage
Send a message via MSN to DOUG G
Re: 1968 Stock 327 Pushrod Length

Quote:
Originally Posted by Vintage 68 View Post
Guys - this isn't the "Performance" forum

He's obviously not going for a all-out street HP build here, just trying to get a little bit more out of a 'stock' 327/210!
He's not 'Zero-Decking' for max compression, angle milling the heads to reduce chamber cc (or even fitting the latest trick head confiquration needing custom pushrod lengths), changing Rocker ratios and other common mods required for a max efficiency HP build ... so matching pushrod length to lever is just not necessary at this point

I also read into the post he's not as mechanically inclinded as some and needed a base number to get his engine back operating correctly so he can enjoy his modifications to date ...

Lets get the correct 'stock' pushrods back in there, get the valve train adjusted correctly for his performance level and go from there.
If he posts back he's ready to move on to the next level, I'll be among the first to explain optimizing the ratio, centering the rocker contact and getting the system adjusted correctly
As I have in many other posts where the OP asked for that level of information ...

As always JMHO
Understood.... but he swaped heads which means gaskets,and rockers...all bets are off. Better to check and be safe IMO.

68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
DOUG G is offline  
post #9 of 12 (permalink) Old Apr 10th, 11, 08:02 AM
Senior Tech
Mike
 
Join Date: Aug 2008
Location: Newark Delaware
Posts: 590
Garage
Re: 1968 Stock 327 Pushrod Length

Quote:
Originally Posted by DOUG G View Post
Understood.... but he swaped heads which means gaskets,and rockers...all bets are off. Better to check and be safe IMO.
I agree Doug whenever you swap to aftermarket alum heads you should always check pushrod length.I went to dart heads and every one of my intake pushrods were hitting had to have them clearanced,although stock length worked in my situation i know others that it did not.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


67 RS 355sbc 11.76et @ 116mph 1.67 60' Deluxe Parchment interior
Bad67355 is offline  
post #10 of 12 (permalink) Old Apr 10th, 11, 06:53 PM
Senior Tech
darrell
 
Join Date: Feb 2011
Location: texas
Posts: 1,202
Re: 1968 Stock 327 Pushrod Length

when you build engines , you chek everything and clearances regardless-if this was done-it would have been caught before even firing-atleast that is what i do in my 30 yrs building
97Z4C is offline  
post #11 of 12 (permalink) Old Apr 11th, 11, 08:23 AM Thread Starter
Tech Team
Patrick
 
Join Date: Oct 2006
Location: Elizabeth, Colorado
Posts: 37
Re: 1968 Stock 327 Pushrod Length

Sorry guys....just now getting back to the forum.

Not sure how to take the comments from Vintage 68...... I am mechanically inclined and do have experienced in building engines. It's just that this is my first roller valvetrain engine. I marked my valve stems and retightened my rockers, went through a full rotation and they are spot on as far as centered throughout the full travel of the roller on the stem. My entire issue turned out to be proper tightening of the polylocks....

I was mostly concerned with what the stock lenth was because Edelbrock said that 7.191 was stock and it didn't make sense to me as the roller lifters sit so much higher.
pbranen is offline  
post #12 of 12 (permalink) Old Apr 11th, 11, 09:33 AM
Gold Lifetime Member
John
 
Vintage 68's Avatar
 
Join Date: Mar 2002
Location: Moraga,Ca.,USA
Posts: 13,705
Re: 1968 Stock 327 Pushrod Length

Quote:
Originally Posted by pbranen View Post
.... Not sure how to take the comments from Vintage 68...... I am mechanically inclined and do have experienced in building engines. It's just that this is my first roller valvetrain engine. ...

I was mostly concerned with what the stock lenth was because Edelbrock said that 7.191 was stock and it didn't make sense to me as the roller lifters sit so much higher.
Since your OP was;

Quote:
Originally Posted by pbranen View Post
... I recently installed the Edelbrock Performer E-tec 170 top end kit on my original 327. This was an original 210HP version with a 2 barrel. ...

... Apparently you're suppossed to adjust them, back them off a quarter turn and then lock them and retighten back from the quarter turn. This may have been most of my problem but also am finding that 7.191 was not the stock size and that 7.8 is.

Does anyone know what the correct stock pushrod length is?
Two things in the OP were, I thought, fairly obvious ...
1 - you were just upgrading a stock 327/210 with a 'kit' for a little performance improvement and some 'bling' - not doing a HP build using performance matched aftermarket intake, heads/valve train and cam for max. output ...
2 - you didn't really understand the standard procedure for setting up a valve train ...

Sorry to insult your intelligence with my reply - I just didn't want the replies to drive you off into another geometry area, in search of your OP request to get the 'stock' pushrod information ...
I'll stay out of your posts - you obviously know what your doing

Back to building my 'little' (vs. >1000ci anyway) engines ...

1968 Convertible
Some trucks
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Other V8 things - some of which float
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Other V6 things - none of which float
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Oh yeah, and 1 "Straight-Six" ...
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


If a man says something in the garage - and his wife can't hear him - is he still wrong !!!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Vintage 68 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

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:
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.
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:
OR

Log-in










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