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I don’t mean to sound like a prick, but a headshop or shop that’s doing heads and don’t know or can’t find the clearances for said heads, probably shouldn’t be doing the job... instead of asking the customer for answers. Sent from my iPhone using Tapatalk

Unless you have a non-linear spring, in my brain changing the preload doesn't change a thing? If a spring is, say, 10kg/mm, it's 10kg/mm whether it's 0% compressed or 50% compressed, so compressing the spring more doesn't require any difference in force? It does mean the spring pushes against the perch a bit harder though.

@wrcfan21 if you are still looking to get your engine done bring it in and we'll get it sorted for you. I know it is a fair distance but it's well worth it for a solid engine that will give you no troubles. If you have any more questions flick me a message or give us a call again. Can arrange to get car or engine picked up as well. Thanks Pat

As a side note just re-reading this thread, is it even important to have each corner of the car react the same to a bump? I dare say it's almost an impossible thing to achieve outside the confines of something like Formula 1, just the distribution of weight in the car, different stiffness, and the frankly probably enormous variance in the tolerances and construction of the car means you're never going to get even close. But it's all moot anyway, because when is your car ever going to experience exactly the same "bump" on all four wheels?

+1 Shop should not be asking you for those kinds of answers, one it leaves you open for all kinds of grief if they do it wrong and something unfortunate happens and secondly... if you knew then you would probably be capable of doing the job yourself haha

Another random question. The shop doing the heads has asked what the valve clearance should be. He recons it is different for this model compared to older STi's. I can only find the EJ257 manual online. Will the clearance be the same?