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Old 20 July 2004, 08:36 PM
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Mark A
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Default Head Identification help
Please can anybody able to tell me how I can identify STi version 2 & 3 heads. The heads are off the car with no cam covers.

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Old 21 July 2004, 01:54 PM
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Anybody ?
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Old 21 July 2004, 07:35 PM
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I needed to know this a while ago. iirc it was to measure the cams profile.
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Old 21 July 2004, 07:40 PM
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Big Bear
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STI 2 heads are hydraulic lifters and the 3's are solid lifters with shims
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Old 22 July 2004, 10:14 AM
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How can I tell if they are hydraulic lifters ?

Can you compress them ?

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Old 22 July 2004, 06:38 PM
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If they are Hydraulic there will be a gap between the follower and the camshaft (I think)
Non-hydraulic lifters are shimmed, so no gap


If you take a follower out it will have a groove around the middle if it's hydraulic
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Old 22 July 2004, 08:20 PM
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Originally Posted by Dyney
If they are Hydraulic there will be a gap between the follower and the camshaft (I think)
Non-hydraulic lifters are shimmed, so no gap


No, says it's not true
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Old 22 July 2004, 08:24 PM
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How do you measure the cam profile?
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Old 22 July 2004, 09:16 PM
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Also around the plug area the version 2 is shaped like a head with horns , the version 3 has a diamond shaped are . Hydraulic lifters have a hole in the sides to allow oil into the lifter
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