Stage 1 2 3 factory upgrades for the GN

[Big Poppa Bear]

Is this true? Are there Stage upgrades that are straight from GN? And if so... Are these parts still in stock anywhere? :drive:

[Keller]

I'm not sure I understand the question. :ugh:

GM made Stage I blocks, as well as Stage II blocks, heads, cranks, etc. These parts are not really exchangeable "bolt-ons" that you can just quickly swap into a TR.

The Stage I blocks are pretty close to stock blocks.

There are enough differences between the Stage II blocks/heads and the stock items that they really aren't able to be swapped directly. The Stage II heads have more bolt holes so that more bolts may be used for more clamping force. The cranks will not exchange with stock blocks. The heads use different types of rockers. Different main caps with more bolts. Etc, etc, etc.

See our Photo Guides and "History of the V6" article for more info.