85-87 Engine Differences

[onequik6]

what is the differences between a stock 85 3.8 turbo engine and a 87 3.8 turbo engine both from a GN . other than the obvious hot air setup.
I noticed the casting number difference from a 440 (85) and a 109 (87) block

My main question is for a build up . just wondering if the block and heads crank rods and pistons were worth it if i use the 85 block . thanks for all info ahead of time.

 

[Boost231]

please do a search. this has been covered/asked ALOT

 

[T- Type Tim]

well i'll be....

 

[novaderrik]

the later engines had a lower deck height and thicker head gaskets, and the blocks were drilled for the turbo oil return line in the front.
i think that's the major stuff, other than the induction and exhaust setups.

 

[tta1240]

here is what i was told about them.
http://www.turbobuick.com/forums/engine-tech/263059-84-85-86-87-109-block.html

 

[charlief1]

There are also differences in the oiling passages. The 109 block is the better choice overall though.

 

[onequik6]

thanks for the info