So in order for me to update my heads to the 20mm dowel heads I know i need the stepped dowels, i would assume that now i would want the 20mm gaskets. I heard I would need different injector hold downs. wonder if the hold downs are true and if there is anything else I would need to do the conversion.
You would want the 20mm head gaskets. As far as the injector hold downs. I took this from the Ford Shop manual.
NOTE: Early build cylinder heads, head gaskets, cylinder block, rocker arm carriers and injector hold-down clamps are not interchangeable with late build engines. It is necessary to identify the head style prior to working on the cylinder heads. Early build heads are equipped with injector hold-down clamps with a square end and a T40 Torx® bolt. Late build heads have injector hold-down clamps with a tapered end and a T45 Torx® bolt.
Determine if the cylinder heads are early build (left frame of illustration) or late build (right frame of illustration).
Mine is an early build 06 that has an 18mm block with 20mm heads due to replacement as well. I am nearly positive the differences are in the rocker carrier and not the head itself. all of your stuff should bolt right onto the new heads. I have the square end hold downs and am using them on "new build" heads with no issues.
You should only need the 20mm gaskets and the stepped dowls which comes with the ford gaskets.
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