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I have had some issue with the head gasket losing the seal between cylinders 3 and 4. I have also purchased some parts motors and they had the same issue. The last time I rebuilt my 180 I bought the best head studs I could from ARP and resurfaced the head and deck. I got about 20,000 before the head gasket failed. Looks to me like a heat issue almost like the coolant flow is not enough to carry the heat away in the back. Has anyone else seen/solved this problem?

I think people usually have problems between 2/3 where the gap is narrowest. I had an issue with one head i had blowing bwtween 2/3, had a spare machined and it lasted quite a while until i got bored of the 1.8. Maybe check the water jackets for a clog or look for a kinked/crushed coolant line, not sure what else could be a problem in the back of the block

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Luvless
1980 Mikado-Sold.

1993 Lexus SC400 my Daily
2004 Yamaha WR250F my new love in life
2016 Toyota Camry my girls ride

Be sure to re torque head bolts after several thousand miles. And definitely after any over heating.