What size is the 2004 5.7 hemi
what size is it, the 345 or the 347

I think it's a 345 .
The first generation 5.7 liter Hemi produced roughly (it varies by car/truck) 345 horsepower (5,600 rpm) and 375 lbft of torque (4,400 rpm) from 5.7 liters (345 cid*) when used in the Dodge Ram  one horsepower per cubic inch. In the Charger, 300C, and Magnum RT, it produced 340 horsepower but 390 lbft of torque. [Exact LX figures: 340 horsepower (254 kW) @ 5000 rpm and 390 lb.ft. torque (525 N•m) @ 4000 rpm. The Charger Daytona R/T squeezed out 350 horsepower.] Power and gas mileage boosts arrived for the 2009 model year. 
I think IM likin them 345`s lol they got more hp and torque than a 360

From what I can tell, it's the 345. Allpar.com has a good breakdown on the different engines uesd.

5.7 litre = 347.835341 cubic inch

x2..it's 347 cubic inch's

:smiledown:Well this thread was VERY helpful!!! NOT:4dontknow:
(I know this thread is old, but I had to comment. This didn't help at all.) 
From allpar
Different Dodge listings mentioned 345, 348, 353, and 354 cubic inches as the engine size; possibly different people at Chrysler used different formulas to get at the cubic inches. Gaymon Wright's window sticker lists the Hemi as being 348 cid! Jack pointed out that the bore and stroke times pi times the number of cylinders = 353  perhaps someone at Chrysler incorrectly used that formula. The 354 was probably a simple typo. Derek wrote "the correct formula is pi x (bore/2) squared x stroke. This is because bore is a circle and area of a circle is pi x r squared! Try it and you will find 3.92/2 = 1.96; 1.962 (3.8416) x pi= 12.0687 x 3.58 stroke =43.20 x 8 cylinders = 345.6." (Mark Strode noted that if you use millimeters to avoid rounding error, you get 345.06). 
Quote:

i was always taught liters * 61 gets you your cubic inches

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