Hotrodders.com -- Hot Rod Forum



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


Reply
 
Thread Tools Search this Thread share on Facebook  
  #1  
Old 04-07-2009, 11:33 PM
acav383stroker acav383stroker is offline
Registered User
 
Join Date: Apr 2009
Location: pa
Posts: 1
Wiki Edits: 0

383 Chevy Stroker Valve Train Problem

What I Have Is A Chevy Cavalier With A 383 Stroker In It Tried Starting It And I Just Purchased It And Noticed A Tapping Sound So I Took Valve Covers Off And Noticed A Couple Of Roller Rockers Blue In Color Not Sure What They Are Didnt Get Paper Work Were Loose So I Decided To Readjust Valves So I Got Number One Up On Compression Stroke And Set Timing Mark On Zero And Made A8 Marks On Harmonic Balancer In 45 Degree Increments And Each Mark Representing A Valve But Noticed As I Started To Adjust The Vavles That Some Of Push Rods Are Bent What Could Be The Reason And What Is The Easiest Way To Set Roller Rockers Thanks Dan


Register now (free) or login to remove ads
Reply With Quote
  #2  
Old 04-08-2009, 12:37 AM
F-BIRD'88's Avatar
F-BIRD'88 F-BIRD'88 is online now
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 6,229
Wiki Edits: 0

Looks like you bought something that someone wanted to unload in a hurry.
Let me guess, it was a cheap "good deal"

The bent pushrods will have to be replaced with new ones.
To adjust the valves, you need to position the valve you want to adjust fully closed.
#1 cylinder: Bump the starter over while watching the valves motion.
When the #1 intake valves open, and closes and just arrives back on the valve seat (just closes) , stop and adjust the #1 exhaust valve to spec. ( o lash hyd cam) (.015" .028" lash spec solid cam).

Continue to bump the starter over bit by bit while watching the #1 exhaust valve motion.
When the #1 exhaust valves just starts to open (first starts to move off seat)
stop and adjust the #1 intake valve to spec.
Repeat, using the same method for the other 7 cylinders.

The $$bent push rods$$ are a strong indication of likely over rev abuse, valvetrain interference and/or valve/piston interference.
You may have other more serious engine damage than just the pushrods.
I'd start with a compression test.

Last edited by F-BIRD'88 : 04-08-2009 at 12:45 AM.
Reply With Quote
  #3  
Old 04-08-2009, 12:41 AM
techinspector1's Avatar
techinspector1 techinspector1 is offline
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: In da woods, Union County, North Carolina, USA
Age: 70
Posts: 8,769
Wiki Edits: 326

You need to find out what bent the pushrods. The usual suspects are:
Lack of sufficient piston to valve clearance.
Rocker to stud interference.
Valve spring coil bind.
Retainer to valve guide interference.
Reply With Quote
  #4  
Old 04-08-2009, 03:40 AM
Jmark's Avatar
Jmark Jmark is offline
Hotrodders.com Moderator
 
Last photo:
Join Date: Sep 2003
Location: phoenix
Age: 58
Posts: 4,786
Wiki Edits: 0

Quote:
Originally Posted by techinspector1
You need to find out what bent the pushrods. The usual suspects are:
Lack of sufficient piston to valve clearance.
Rocker to stud interference.
Valve spring coil bind.
Retainer to valve guide interference.



This is going to end up being hosed up on so many levels!!!!!!!LOL

Wasn't a Cavalier originally a FWD transverse engine car? Now it's got a SBC stuffed in it? I'm a gett'n the shivvers just thinking about it!!!
Reply With Quote
  #5  
Old 04-09-2009, 11:27 AM
sandiegopaul sandiegopaul is offline
San Diego Stingray
 
Join Date: Apr 2005
Location: San Diego
Age: 57
Posts: 55
Wiki Edits: 0

Quote:
Originally Posted by F-BIRD'88
Looks like you bought something that someone wanted to unload in a hurry.
Let me guess, it was a cheap "good deal"

The bent pushrods will have to be replaced with new ones.
To adjust the valves, you need to position the valve you want to adjust fully closed.
#1 cylinder: Bump the starter over while watching the valves motion.
When the #1 intake valves open, and closes and just arrives back on the valve seat (just closes) , stop and adjust the #1 exhaust valve to spec. ( o lash hyd cam) (.015" .028" lash spec solid cam).

Continue to bump the starter over bit by bit while watching the #1 exhaust valve motion.
When the #1 exhaust valves just starts to open (first starts to move off seat)
stop and adjust the #1 intake valve to spec.
Repeat, using the same method for the other 7 cylinders.

The $$bent push rods$$ are a strong indication of likely over rev abuse, valvetrain interference and/or valve/piston interference.
You may have other more serious engine damage than just the pushrods.
I'd start with a compression test.


All very good advice. Can I add something - addressed to the orig poster? It would really be helpful to try making your messages easy to read.

Insert paragraphs where needed, and periods after each sentence. Not trying to be a jerk here, but it's a GOOD thing your original post was short. A lot of people may not even have tried to read it.
Reply With Quote
Back to top


Recent Engine posts with photos


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Similar Threads for: "383 Chevy Stroker Valve Train Problem"
ThreadThread StarterForumRepliesLast Post
Valve Lash adjustmenthiballEngine3605-11-2009 10:12 AM
timing for a Chevy 383 stroker40forddgcEngine1309-01-2008 12:58 PM
Supercharging and fuel injecting a 383 ChevyNoesisEngine1109-21-2007 05:51 AM
SB Chevy Balanced 383 Stroker Kit from CNC-Motorsports.combccsrcEngine1901-04-2006 06:51 AM
GM fast burn headsbatman09Engine110-26-2004 09:32 AM



Powered by: vBulletin Version 3.0.7
Copyright ©2000 - 2012, Jelsoft Enterprises Ltd.

Search Engine Optimization by vBSEO 3.6.0
All times are GMT -6. The time now is 11:48 AM.
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.