I think the main reason you do not see more of them is just the expense. For what you want that being good power and good fuel economy with a budget to support a LS9 it would be a good pick.
It seems to me that most people spending that much money want all out power and go with RHS or LSX blocks.
As to the 6l90 trans the main reason you do not see more of those is that they are far more difficult to tune and are significantly deeper as I recall forcing the engine to be moved higher up for pan clearance.
Your build would be undeniably cool and likely a great driver as the LS9 is very well engineered for reliability while still making 600+hp all with good fuel economy.
That said it seems a little silly to be talking about fuel economy when you are going to be around 35k in engine, trans, swap components, custom headers (going to need custom to get 2" primaries on the 66s unfortunately or even 1 7/8th)...
That is probably 20k more than a used LS2/3/6.0 and 4l80e that would have equivalent fuel economy. Or 15kish over the above with a maggy on it. sure you get better reliability but 15k buys a hell of a lot of gas. (thats an optimistic 400 thousand mile break even point if there ever would be a break even point between a cheep 6.0/4l80 and a LSA/6l90)
Last edited by rfrankb4; 11-04-2011 at 08:04 AM.
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