Tech / General Engine Is your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!

Pushrod clearence

Thread Tools
 
Search this Thread
 
Old 10-07-2018, 06:50 PM
  #1  
Member

Thread Starter
 
scamaro355's Avatar
 
Join Date: Dec 2003
Location: wv
Posts: 489
Received 0 Likes on 0 Posts
Car: 92 rs
Engine: 355 stealth ram, dart heads, S480
Transmission: 4L80E
Axle/Gears: 3.42
Pushrod clearence

anyone running dart heads had problems with the pushrod hitting the intake runner and causing alignment problems??
Old 10-07-2018, 08:07 PM
  #2  
Supreme Member
iTrader: (1)
 
GeneralDisorder's Avatar
 
Join Date: Mar 2017
Location: Portland, OR
Posts: 4,255
Received 422 Likes on 323 Posts
Car: 86 Imponte Ruiner 450GT, 91 Formula
Engine: 350 Vortec, FIRST TPI, 325 RWHP
Transmission: 700R4 3000 stall.
Axle/Gears: 9 Bolt Torsen 3.70
Re: Pushrod clearence

Sometimes you need to loosen the studs and move the guide plates....are the guide plates the right size for those heads? Sometimes aftermarket heads have the valves stems in slightly different places than stock heads to facilitate port sizing, valve sizing, etc.

it's to got be the choice of parts. Either the guide plates or the rockers. Push rods are just straight tubes, and the location of the valve stems and the lifters are the last thing I would suspect. Something about those rockers or guide plates are not matching up to those heads.

GD

Last edited by GeneralDisorder; 10-07-2018 at 11:26 PM.
Old 10-07-2018, 09:13 PM
  #3  
Member

Thread Starter
 
scamaro355's Avatar
 
Join Date: Dec 2003
Location: wv
Posts: 489
Received 0 Likes on 0 Posts
Car: 92 rs
Engine: 355 stealth ram, dart heads, S480
Transmission: 4L80E
Axle/Gears: 3.42
Re: Pushrod clearence

The guide plates are the ones that came
with the heads. Since the engine is still on the stand. I pulled the guide plates off and still have the same problem. The push rod is hitting the intake port on the head. Def a head problem. Time to grind or look into .150 offset rockers for the intake vales.
Old 10-07-2018, 11:25 PM
  #4  
Supreme Member
iTrader: (1)
 
GeneralDisorder's Avatar
 
Join Date: Mar 2017
Location: Portland, OR
Posts: 4,255
Received 422 Likes on 323 Posts
Car: 86 Imponte Ruiner 450GT, 91 Formula
Engine: 350 Vortec, FIRST TPI, 325 RWHP
Transmission: 700R4 3000 stall.
Axle/Gears: 9 Bolt Torsen 3.70
Re: Pushrod clearence

https://www.google.com/url?sa=t&sour...KPQYswxQPadwW0

Looks like you may have to modify the head.

GD
Old 10-08-2018, 06:46 AM
  #5  
Supreme Member

iTrader: (20)
 
Orr89RocZ's Avatar
 
Join Date: Sep 2003
Location: Pittsburgh PA
Posts: 25,750
Received 369 Likes on 298 Posts
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: Strange 12 bolt 3.42
Re: Pushrod clearence

What size pushrod?

its not uncommon to have to use adjustable guideplates when setting up heads. 5/16 shouldn’t have an issue but more common with 3/8” and larger

if pushrods are correct length and its still hitting i would just grind abit. Use a sanding roll
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Mkos1980
TPI
1
11-27-2001 11:59 PM
Bunker82
Tech / General Engine
7
10-10-2001 10:03 AM
SCOTTCAMARO1
TBI
6
09-06-2001 09:33 PM
APCAMARO
Auto Detailing and Appearance
9
12-04-2000 07:01 AM



Quick Reply: Pushrod clearence



All times are GMT -5. The time now is 11:14 AM.