Quote:
Originally Posted by LateralJeaz
Yes gunner has a slightly modded lt4. Yes the lt5 is very similar to the lt4 but with a bigger blower and a few other minor differences, and yes those are both tweaked supercharged versions of the lt1 (with forged internals, etc).
Even gm says word for word the lt4 is 'based' on the LT1:
http://media.chevrolet.com/media/us/...owerhouse.html
For clarification, I just meant further down the line in the LT evolution as the aftermarket starts to roll, I could see mark possibly even wanting to get his hands on this upgraded blower and collaborate on a custom engine build rather than going full crate lt5.
Carry on 
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Ok.. not arguing that it's the same engine family. The LT5 is to the LT1, as the LS9 was to the LS3.
Where I disagree is the generalization that the LT5 is a LT1 with "tweaks and a big ass blower". To me, there is already enough information out there to suggest it's a little more than that.