I was looking through the archives of a British Car forum and I came across this in a discussion. Thought it might interest some of you. The author owns/runs http://www.killerbv6.com/. As always take everything you read on the internet with a grain of salt, but his findings seem to make sense. If you want to read the entire thread go here...it's a lively discussion about FWD vs RWD v660 engines:
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It's true that the most HP offered in any V60 GM vehicle is 185 HP. We ran a stock 1999 Chevy Venture test engine with an unfiltered throttle body and 12 inch pipes, one pipe per cylinder into open air and achieved 193 HP on the dyno. We ran it again with a K&N filter attached to the TB and lost 3 HP. We ran the same engine with filter and Jet Hot silver coated headers, tuned for peak performance at 6000 RPM. It produced 221 HP at 6100 RPM and peaked out with a slightly flattened curve out at 6500 RPM because of the stock roller cam, but lost 7 HP@ between 6800 and 7500 RPM.WE USED A 1994 CORSICA HACKED FACTORY ECU WITH NO MODIFICATIONS OTHER THAN A STUB CONNECTOR CHANGE! We have produced an easy 292 HP with a 3.1 with a cam change, honed intake manifold, 10.5:1 pistons, larger stainless valves and an after market throttle body and a Haltech F3 ECU.In other words I am being conservative about the output that I mentioned in the previous columns. By track figures and computer derivations the modern 3400 puts out closer to 215 HP with free flowing filtered intake system and exhaust. I merely said I can GUARANTEE 200+ HP with a good set of headers like the ones we use and on the website.
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It's true that the most HP offered in any V60 GM vehicle is 185 HP. We ran a stock 1999 Chevy Venture test engine with an unfiltered throttle body and 12 inch pipes, one pipe per cylinder into open air and achieved 193 HP on the dyno. We ran it again with a K&N filter attached to the TB and lost 3 HP. We ran the same engine with filter and Jet Hot silver coated headers, tuned for peak performance at 6000 RPM. It produced 221 HP at 6100 RPM and peaked out with a slightly flattened curve out at 6500 RPM because of the stock roller cam, but lost 7 HP@ between 6800 and 7500 RPM.WE USED A 1994 CORSICA HACKED FACTORY ECU WITH NO MODIFICATIONS OTHER THAN A STUB CONNECTOR CHANGE! We have produced an easy 292 HP with a 3.1 with a cam change, honed intake manifold, 10.5:1 pistons, larger stainless valves and an after market throttle body and a Haltech F3 ECU.In other words I am being conservative about the output that I mentioned in the previous columns. By track figures and computer derivations the modern 3400 puts out closer to 215 HP with free flowing filtered intake system and exhaust. I merely said I can GUARANTEE 200+ HP with a good set of headers like the ones we use and on the website.
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He should have said PUSHROD 660. 
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