CR and Valve Clearence - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Australian Falcons Discuss the australian born and bred models here. Includes the 80's 90's and present day Falcons offered by Ford Oz.

LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old 06-17-03, 08:17 AM Thread Starter
Looking in YOUR bathroom.
Join Date: May 2002
Location: Adelaide
Age: 33
Posts: 3,287
CR and Valve Clearence

Does anyone know of the valve to piston clearence for the 4.0L EF motor?

Im looking to put EF pistons/head onto my EAblock (bored to suit 4.0 pistons) and use a lumpy cam to get some power out of the motor.

It will run on straight LPG through a GRA setup and as such i will try to get compression arround 11:1 or possably more (havent discussed it at length with any engine bulders yet).

Im of the opinion that shaving the head and changing to the EF pistons is the best way to increase compression, along with a thinner headgasket. However i dont see how a slight reduction in bowl volume and a shave of the head will get compression above 11:1. Will i need to go for flattop or higher crown pistons? Or is their another method of increasing compression.

With the head being shaved and a bigger cam being installed, im wondering about valve clearence. Does anyone know howmuch clearence i have to play with? With a shaved head piston to valve clearence will be reduced.



Ive been described as a vault of usless random knowledge.

Ill take it as a complement i think.............
Walkinshaw is offline  
Sponsored Links
post #2 of 2 (permalink) Old 06-17-03, 05:02 PM
Registered User
Join Date: Jun 2003
Location: perth
Posts: 18
decking the block will also increase compression (thats a fair bit of compression!) - its not a bad idea because sometimes the heads / blocks can be a fair bit out of square and it might save some head gasket worries later
RMAassisted is offline  
Sponsored Links

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Ford Cars and PAG Vehicles > Australian Ford's Discussion > Australian Falcons

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
BA Falcon Engine Reveal RPO83 Ford Worldwide News 0 09-04-02 07:27 AM
Heater hoses/water valve SPHELL General Tech 3 06-27-02 02:41 AM
Vris Check Valve Question rdhubba Ford Probe Forum | Mazda MX6 Forum 3 01-05-02 06:41 PM
Help me please!! musatangfun641/2 Ford Mustang Forum 4 03-02-01 07:12 PM

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
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome