[ab_mach1]

The 99's had a cooling issue, I believe. There was something with the coolant circulation on the driver's side head. Your Pop may have already fixed the problem they had. I found this...

The 4.6 two-valve engine coolant fill problem was "fixed" by moving the pressurized reservoir to the fan shroud, where it's at the high point of the system. The 4.6 four-valve engine still has a coolant crossover pipe at the top front of the engine, and you have to remove the plug in that pipe and fill the engine through the opening. If you simply pour coolant into the reservoir, it won't fill the engine. And despite the fact that the reservoir is pressurized, it may take forever to burp. The engine will overheat (and the heater won't work well in winter).

 

[ab_mach1]

Yeah.. thanks everyone. Exhaust does actually add power. Can't believe you said that to an automotive engineer, but whatever. Look, I understand how and what to upgrade lol, I want to know the technical differences. Tolerances, specs, etc. The block differences were good to know. Like I said, I'm very familiar with the 03/04 Cobra. I already know the internals and specs, what I need is the info on the 99 cobra. Thanks.

Well, ya know, we can't see the diploma on your wall. Be more descriptive in your posting and you will get the answers you need, to the best of the communities knowledge.

 

[ab_mach1]

So OP, it appears that you have learned a few things and then some. :good: