V3 V4 Heads
#1
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Location: Ellesmere, Shropshire
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V3 V4 Heads
Hiya guys, whats the actual difference between v3 and v4 heads and how can you identify the difference between them?
Cheers Guys
Cheers Guys
#3
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The head Castings/valvetrain/and cams are the same, although some of the late Version 4 engines came with the later single bolt cam belt tensioner(not head related though) - the difference is between the WRX and STi Version 3 and 4 heads.
It has been said that the Vers. 4 STi heads came with milder cams(lift & duration) but i have never seen any difference in the cams TBH.
WRX/UK Version 3 + 4
Composite Head Gaskets.
IDN/EDN Valves.
48mm Orange Coded Valve Springs.
Outer Shim Buckets 33mm OD.
LHB/RHB Head Codes.
STi Version 3 + 4
Thick MLS Head Gaskets.
IH/EH Valves.
56mm White Coded Valve Springs.
Inner Shim Buckets 33mm OD.
LHB/RHB Head Codes.
Hope this helps you scoobycraig.
Mick
#6
Scooby Regular
LOL I swear there is nothing Mick doesn't know about v3/4 engines. I've lost count of the amount of times I've had to ask him something. But having had a set of WRX4 and a set of STi3 and STi4 heads apart, the two STi versions looked the same to me.
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