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Hi guys

Just test fitted some Tomei Poncams into my R34 GTT. In the sheet that Tomei supplys it states that I need a 0.45mm clearance between the bottom of the cam, I cant think of the name of the part I'm looking at, and the buckets. Right now I have a 0.30 clearance on the Intake and a 0.33 clearance on the exhaust side. You can see the specs here

My question is, how do I increase the clearance from .30 and .33 to .45. Do I need new buckets or the old ones re-shimmed, as I've been told?

Any help would be great. Thanks

edit: forgot to add they are 260 degree 9.15mm lift type

Edited by muchogarcia34
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if they are fine how they are now, why do tomei specify a clearance of 0.45mm when the standard clearance is meant to be 0.20mm IN and EX ??

im not saying your incorrect, but i would like to know the reason why tomei would want to make a head noisier if it purely doesnt matter?

i was in the same boat a few months ago but we shimmed them to 0.45mm and they have been fine ever since, very smooth engine operation, very chunky midrange, just a tad ticky on idle haha

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if they are fine how they are now, why do tomei specify a clearance of 0.45mm when the standard clearance is meant to be 0.20mm IN and EX ??

im not saying your incorrect, but i would like to know the reason why tomei would want to make a head noisier if it purely doesnt matter?

i was in the same boat a few months ago but we shimmed them to 0.45mm and they have been fine ever since, very smooth engine operation, very chunky midrange, just a tad ticky on idle haha

Its all to do with thermal expansion - obviously higher horsepower cars will have higher EGTS meaning valve stem expansion will be greater. I agree with paul the clearances you have will be fine.

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