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Ecotec Heads S1 or S2

Col74

Col74
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Apr 30, 2006
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VS Calais S2 V6
Hi guys, my apologies if the has been asked before. I did a search but could not find anything.
This is for Ecotec only (VS). How do i identify between series 1 heads and series 2 heads. I have heard series 1 heads have spring recession problems and i have a spare set of heads, maybe from series 2 motor.
Thanks guys.
 
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