[Supras] Question about head gasket (hopefully last)

[Supras Ireland Admin]

Just to steer away from the flames il ggo for the last question, the 1jz and
2jz have different coolant passage designs, and the most notable thing is a
metal headgasket from the factory.
Though the 1j and 2j arnt totally amune to headgasket failure - ive seen a
few

Marty
----- Original Message -----
From: <berniek at technicaldevelop.com>
To: "Craig Thommes" <cthommes at adelphia.net>
Cc: <Supras at supras.com>
Sent: Sunday, June 04, 2006 3:24 PM
Subject: [Supras] Question about head gasket (hopefully last)


> Inline 6 cylinder engines are probably the longest which use aluminum
heads and iron blocks.  Other engines have shorter heads, which minimizes
cumulative end to end differential expansion or head warping.  Most 7M
gasket problems happen at the sixth cylinder, apparently due to cumulative
differential expansion.  My JDM engine showed deep grooving in the head and
block around the stock gasket crimped rings, especially at the ends,
presumably from tendencies of the block and head to "walk" with respect to
each other due to thermal cycling.
>
> I do not want to add fuel to a flame war here.  I just want to know what
the consensus is regarding life to be obtained from a 7M with a Cometic
gasket (mine was special ordered as 2 mm thick).  I'll be running 14 PSI
boost and ARP head studs.  I'd like to be able to get 150K miles with
periodic retorquing if needed.  Got that from the stock head gasket with 72
Lb-Ft. retorquing at 8 PSI.
>
> Just out of curiousity, what did Toyota do in the 1J and 2J engines to
eliminate the problem?
>
> Thanks.
>
>         BernieK
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