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It's never just the head gasket on an aluminum engine.
It's usually a warped head and possibly the block too.
Assuming coolant has leaked into those cylinders for thousands of miles they are likely badly tapered. The old engine is a boat anchor.
If you pull the heads off the newer engine you will be able to see how low miles it really is.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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