Could a blown gasket or cracked head cause my xj to overheat at highway speeds? I've changed just about everything on the cooling system and it has not made a difference. Once the temp gets over 210 the oil presure drops below 20 when idling. This has happened ever since it over heated when driving up a very long mountain road.
I noticed that the head number on my 97 is 0630 I'm guessing that is better than having the 0331.
I noticed that the head number on my 97 is 0630 I'm guessing that is better than having the 0331.