BT4 swaps are fairly difficult. The engine its self is pretty pricey.
A BT4 swap breaks down as being far more expensive, way more complex for a slight fuel economy gain over a chevy diesel swap.
I have seen one BT4 swap into a 92 or newer suburban over on diesel place and the guy never posted any fuel economy numbers and I got the feeling he wasn't real happy with the end product.
You could always do a duramax swap, cost would be close to the BT4 but the duramax will bolt up to the transmission, motor mount adaptors can be bought off the shelf at a number of retailers.
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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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