Whats the Difference?

[T-Type S10]

Whats the Difference between the 84-85 Engines and the 86-87 Engines, other than the intercooler... I.E. are the any internal engine changes, ect???


Thanks,
Jeff.

 

[Rob B]

Yes, differences are present. I do believe that the 86 blocks had been beefed up in the side skirts. The 87 blocks had even more. I don't think the heads were different, but I am not 100% sure. Please correct me if I'm wrong on any point.

Check out www.gnttype.org for some good information.

 

[jastrckl]

throttle body/plenum/etc changed, from what I know. the plenum definitely did but I think the throttle body is different, not just repositioned for the intercooled cars. Another big difference was the programming in the chip to take advantage of the intercooler.

 

[bruce]

Originally posted by T-Type S10
Whats the Difference between the 84-85 Engines and the 86-87 Engines, other than the intercooler... I.E. are the any internal engine changes, ect???

Heads bolts and the top of the block is different.
The 86-87s have the head bolt threads recessed into the deck surface, supposedly to help headgasket like. I've been using a 85 block in my car without any problems, and I run lots of boost.