Comparing Stock 4V Heads

[32icon321]

Are all 4V heads the same? I found a good deal on a lincoln mark VIII longblock with 4V Heads. Will these heads bolt up to a 5.4 shortblock? How are these heads different from navigator heads or 03/04 cobra heads?

 

[mustang50v8]

Are all 4V heads the same? I found a good deal on a lincoln mark VIII longblock with 4V Heads. Will these heads bolt up to a 5.4 shortblock? How are these heads different from navigator heads or 03/04 cobra heads?

mark VIII heads are "b" heads, which are the same as the ones used on the 96-98 cobras. 99-01 cobra heads are "c" heads as are the 03-04 heads, but the 03-04 heads are revised and flow better. FR500 heads are also "c" heads, but they are better for N/A than the cobra heads. "B" heads and "C" heads have different shaped intake ports, so the intake manifolds are not interchangeable.

there is alot more to explain, but those are the basics