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Australian Falcons Discuss the australian born and bred models here. Includes the 80's 90's and present day Falcons offered by Ford Oz.

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Old 06-17-2003, 08:17   #1 (permalink)
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Join Date: May 2002
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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.

Cheers

Daniel
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Old 06-17-2003, 17:02   #2 (permalink)
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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
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