how to tell :hot air conversion or diff engine

[Madmustard]

So how can I tell if this 84 gn has the stock engine with the intercooled conversion added or was a 86-87 style engine swapped into it?

 

[gunslinger]

86-87 blocks are 109 castings with an oil return plumbed into the front of the block just above the timing chain cover. HA blocks are 329 castings an don't even have a boss cast into the block for turbo oil return.

IIRC, they also have different oil pans. A 109 has 20? bolts and a HA has 14?

 

[BRAD_PADGETT]

IIRC, they also have different oil pans. A 109 has 20? bolts and a HA has 14?[/QUOTE]

Clarify here. 84 and some 85 hot airs have 14 bolt pans. Most 85 hot airs have 20 bolt pans. Go by block casting number. Brad

 

[hesermon]

Brad is right, my 85 is 20 bolt pan. very easy to look at front of motor where turbo oil return line is (or should be), the 86/87 has a raised flat portion where the return line plumbs in, the HA don't.

 

[UncleDave]

As others have said, if you '84 has the original block, it will be a 14-bolt pan. AFAIK all '84's were 14-bolt.