Help -- L98 aluminum head plug torque - 1989-1990 ??

Factory shop manual (1989) discusses aluminum head considerations (anti-seize etc.) and says 22 Ft-lbs.
Happened to look in Haynes for C4s. It says 22 Ft-lbs for
cast iron heads and 12 Ft-lbs. for aluminum heads. Does not distinguish between L98s and LT-1s.
Misprint in the 1989 Factory Manual ??? Wonder what the 1990 manual says?
The old plugs came out very-very easily. Measured the cold torque on two of the old plugs -- 15 on one, 19 on another.
Ideas? Anyone have a 1990 manual?
--
PJ

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No longer have my '92 manual but the LS1 says 15 Ft-lbs. for a new head and 11 Ft-lbs. for subsequent installations. Cadillac Northstar says 11 Ft-lbs. guessing not many install new heads on their Caddy.
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Dad wrote:

Thanks Dad, I'll go with 12 and consider the 22 in the book as an accidental carry-over from the '88 manual (cast iron figure). Thanks too for the LS-1 figure -- couple of years away for plugs on that one.
--
PJ

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