No.They are adjusted by shims under the camshaft hence the advice to check before belt as it's a cam out job to adjust.
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Shims are available from the main dealers for not that much money really ( fiver roughly ) and in a wide variety of sizes, having said that you may not get the exact size shim you require and may need to get the nearest closest size to what you need.
I always advise to set the clearances on the larger side of the tolerance as this way you have some leeway for further valve recession and still remain squarely within tolerance as the engine ages further ( future proofing ).
Should you need a shim that isn't available off the shelf it is acceptable to flat a shim off with wet and dry on a flat surface, use a micrometer or good vernier caliper to keep an eye on the size. This is how I do it and it works.
Do take care of the cam bearing caps otherwise it will be a new head needed and always fit a new cam oil seal, don't forget to use sealant under the cap as specified in the manual.
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