h2pmr

do GT cylinder heads fit on and work ok on a GTS block?
are there any other differences in the GTS block/pistons/crank which would stop it being a direct replacement to drop into a GT?.
GTS and GT are both ROW versions.
thanks in advance
Phil
90gt

RyanPerrella

Phil,

You could use a GTS crank, rods and pistons in a 5L block and it would work. You could also use an S4 or GT crank, rods and pistons in a GTS block and it would work. But you cant mix a 5.4L crank with 5.0L rods or pistons.

Vilhuer

As long as pistons are correct diameter. Tolerance group has to be same.

It is possible to use S4/GT or any older 928 rods in GTS. All critical dimensions are same. Only difference is weight but thats not a problem if enough mallory is added to GTS crank. Its not cheap but its possible.

h2pmr

thanks for the info gents,
i was mainly wondering if the oil/water ways will match up between gts block and gt heads.
Phil

Vilhuer

Early GTS used ...4R casting number heads which were also used in late S4 and GT. So no problems at all mixing them.

GregBBRD

I think some misunderstood what you were asking.

James Bailey

There is an additional cooling passage/hole near the exhaust ports in GTS heads and matches up to those on the block but S-4 /GT do just fine without it.

h2pmr

thanks gents,i will be stripping the engine over the comming weeks to see if indeed the bore of the block is damaged-spark plug was out when the fire started-,so has been stood for a few months with water/debris sitting in the bore.
still the car itself is looking slightly better than the burnt mess it was.

happy 928 motoring to all

Phil
90GT getting there
88SE 99% there