5.4 swap

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03-04-2009, 09:28 PM

#11

stevland

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Join Date: Mar 2009

Location: NJ

Posts: 23

from what i read the bottom end of the 4.6 wont hold up if you decide to run boost. and the 5.4 will, because the 5.4 is forged. something like that

03-05-2009, 11:37 AM

#12

Fobra

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Join Date: May 2007

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Posts: 4,064

Quote:

Originally Posted by mustangcat

I was under the impression that the 5.4 and 4.6 had the same power tolerances? Around 450 RWHP.

Even if you do drop in a 5.4, have you considered upgrading your suspension in the front, brakes, transmission, and rear end?

you dont need to do that, not anymore than you would need to with a 4.6 the weight difference is not that much, but motors use the same bore, but only the 5.4 is worth the trouble for the extra cubes, even going to a 302 (5.0 4.6) is only a gain 20 cubes, yes the rods for both motors are the same, so 450 rwhp will be the power limited, but the 5.4 makes more torque - and makes it across the entire rpm band. a nice motor would be the 5.4 and the new trick flow heads with a port job.