Moparchat - Home of MOPAR enthusiasts worldwide!



Go Back   Moparchat - Home of MOPAR enthusiasts worldwide! > Technical Forums > Performance Talk

Click here to search for Mopar cars and parts for sale.


Reply
 
Thread Tools Display Modes
  #1  
Old 11-07-2000, 06:46 PM
ramtuff truk ramtuff truk is offline
Inactive User
 
Join Date: Nov 2000
Location: Norfolk,Virginia
Posts: 104
Cool

will changing to 1.6 ratio rockers help to any noticeable differance on a stock 318 hp motor? Will I have to change pushrods too?Looking for a little more oomph without a major teardown.does mopar performance sell the rockers?Cant find my catalog 86 318 hp 600 performer carb double roller chain windage tray and chrome spark box
Reply With Quote
  #2  
Old 11-07-2000, 09:09 PM
68Charger 440HP 68Charger 440HP is offline
Member
 
Join Date: May 2000
Location: California
Posts: 120
Thumbs up

Changing to 1.6 roller rockers can yield 15-25HP. You will need new pushrods with the change. Mopar Performance has both of them but if you wanted to save a few dollars you might consider buying them from Crane. If you decide to go with the 1.6 ones make sure you have the proper clearances. (piston to valve) Good luck.
Reply With Quote
  #3  
Old 11-07-2000, 11:07 PM
rumblefish360's Avatar
rumblefish360 rumblefish360 is offline
Moparchat Bronze member
 
Join Date: May 2000
Location: C
Age: 57
Posts: 11,120
Post

68charger440HP:

Why would you have to change pushrods?
Reply With Quote
  #4  
Old 11-07-2000, 11:28 PM
ChristianCuda ChristianCuda is offline
Moparchat Barracuda Owner
 
Join Date: Mar 1999
Location: Edinburg, TX 78539
Age: 49
Posts: 784
Post

Most 1.6 Rockers are adjustables which require a cupped pushrod. Most likely his 318 has a Hydraulic cam, lifters and rockers and such they are not adjustable.

I have thought about doing the 1.6 adjustables on my Hydraulic cam and know that I will have to change pushrods and will go with a make your own set. I will be buying the crane Iron 1.6 or 1.7 Rockers. Not the rollers although I would like to get the steel rollers but thats out of my prce range at the moment.

Christian

------------------
Http://ThunderRacing.Knudstrup.net/

68 'Cuda 383 Best of 8.363@83.78 in the 1/8mile which is a mid 12 with a 1.89 60ft
Formula S recreation not original but making like they should have at the factory) Working on adding EFI
69 'Cuda Race Parts Car
76 Duster 273 recent transplant
95 Neon 2.0 SOHC best of 16.96
84 Dodge Ram D50 transplanting 360
Reply With Quote
  #5  
Old 11-08-2000, 01:26 AM
68Charger 440HP 68Charger 440HP is offline
Member
 
Join Date: May 2000
Location: California
Posts: 120
Lightbulb

Rumblefish360, the need to change push rods when migrating to an adjustable rocker can be due to multiple factors. One such factor is that the basic ductile iron rocker arm requires a cup style on the end of the push rod. Another reason is that some adjustable rockers are aluminum roller style where the
manufacturer suggests using a heat treated, or chrome moly, or even thicker diameter push rod. Certain roller rockers (especially those of non-stock ratio) require different length push rods to ensure that the preload is able to be adjusted properly. Hope that explains it.
Reply With Quote
  #6  
Old 11-08-2000, 02:50 AM
DAVE JONES DAVE JONES is offline
Senior Member
 
Join Date: Nov 1999
Location: Webster NY
Posts: 395
Post

Great advice from all. I'd just like to add to watch out for the clearence gremlins where the pushrod goes thru the head. Its usually not a problem butttttttttt.,,,,dj

------------------
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Rocker Ratio 1.6 vs 1.5 rrunnertexas Performance Talk 18 09-15-2006 08:23 PM
rocker ratio biggerhammer Ram Truck Chat 0 05-13-2004 10:30 PM
which ratio rocker do i need for my 440? 73_RoadRunner Performance Talk 5 07-02-2003 05:37 PM
Know rocker arm ratio of 4.0 I6 ? HankL Jeep Chat (Wrangler, Cherokee, etc...) 4 08-15-2002 05:29 PM
Rocker Arm ratio JVMopar Performance Talk 1 02-20-2001 01:57 AM




All times are GMT -4. The time now is 01:20 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
. . . . .