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#1
March 4th 07, 08:44 PM
posted to alt.autos.corvette
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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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#2
March 4th 07, 09:51 PM
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Help -- L98 aluminum head plug torque - 1989-1990 ??
"PJ" > wrote in message ... > 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 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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#3
March 5th 07, 07:20 AM
posted to alt.autos.corvette
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Help -- L98 aluminum head plug torque - 1989-1990 ??
Dad wrote:
> > "PJ" > wrote in message > ... >> 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 > > 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. > 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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