I have a 2008 F150 with a 4.6 engine that my brother ran out of oil. I have a screaming deal on a 4.6 out of a 2007 crown vic police car. What are the complications of interchanging them and is it possible?

 

Should be a straightforward swap. You will need to use the truck intake and exhaust manifolds, I'd also look at the oil pan and oil filter mounting.

 

Thanks for the input. I pick it up this weekend.

 

As long as the block is the same, shouldn't be much to worry about. I cannot remember what had Windsor or Romeo blocks, and when. Should be a wiki page on it somewhere. You will need to use your motor mounts.

 

Romeo and Windsor are interchangeable as long as you don't try to swap heads or some internal parts.

Count the bolts on the driver's side valve cover - Romeo has 11, Windsor has 13.

 

Front cover and accessories are different, aren't they?

 

Here are the basic differences in Romeo and Windsor engines:

# Romeo was the only Modular engine plant from '91-'95.
# Windsor came on line for '96 to build 4.6L and 5.4L SOHC engines for trucks and vans
# Although Romeo is primarily a car engine plant, it has produced Modular engines for trucks
# Although Windsor is primarily a truck engine plant, it produced Modular engines for '99-'00 Mustang GT
# Romeo engines employ different blocks, heads, and cranks than Windsor although they look similar
# Most Romeo blocks are marked with an "R" in the casting
# Windsor blocks are all marked with a "W" in the casting in two places
# Romeo heads employ bolt-on cam journal girdles
# Windsor heads don't have cam journal girdles, just individual journals
# Because Romeo and Windsor engines have different timing cover/cam cover bolt hole sizing, it is best to use Romeo heads and blocks together and Windsor heads and blocks together
# Romeo blocks have jackscrew cross-bolted main caps
# Windsor blocks have dowel pin cross-bolted main caps
# Romeo engines have primarily six-bolt flywheel/flexplate flanges
# Windsor engines have eight-bolt flywheel/flexplate flanges
# Oil filter/cooling neck types vary depending on vehicle type
# Timing cover depends on vehicle type
# Romeo cam sprockets are zero-fit and slip right on
# Windsor cam sprockets are pressed on
# Romeo cam covers have 11 bolts
# Windsor cam covers have 13 bolts
# Difference timing covers for SOHC and DOHC
# Same basic timing chain/sprocket system for both SOHC and DOHC
# DOHC engines have secondary timing chains for secondary camshafts
# SOHC has a standard oil pump and DOHC has high volume