The driveline on a T-5 manually equipped car will cost the motor about 17% of it's power. Why do you think the tranny fluid, bearings, rear end oil, and all the other components get hot? Friction. There is a lot of it, even with a manual equipped car.
An AOD-E automatic version would cost 22%.
I don't know why I came up with 310rwhp, I just started defending my decision without really looking at it. I wasn't even really paying attention to the amount of flow they'd need to make I guess?
Basically what I would be asking is for the stock heads to flow an additional 67% or 150hp, and like I posted on another topic (just never made it back to this one) for that to happen it would take me a week of calculus, and a bucket of JB weld.
Sorry if I offended any one, I really jumped on
SaleenGTS and
Killercanary without thinking about my post. Guess I got a little automatic ego inflation going or something
so I didn't do the math or analyze the combo from a physics standpoint.
Anyway, what does a set of GT-40 irons go for? Last time I checked I think I saw some for about $200/set used. I'm still thinking it's a lot to ask for sure, especially with iron heads, but I think he should be able to make closer to 300rwhp with that combo.
Also, from what I've heard the GT-40X aluminum heads work great with the F-303. I've done some more research on the F-303 as well, it's a good blower cam, but for the most part, unless it's matched real well to a N/A combo, people don't seem to like it at all.