well seeing 4-valve 4.6's have never had an iron block (except termi's) i think you should leave that one alone

 

Sound like you have a 2v or a 03-04 cobra block. 99's had italian blocks and 01's had teklids aluminum.

 

 

99s and some 01s had the teksid (Italian foundry) aluminum block, most 01s had the WAP (domestic foundry) block also aluminum. Only iron 4v is the 03/04 and would be easy to tell as it has forged H beam manley rods. All other iron blocks are 2v I believe.

 

 

maybe I am blind, but does those pistons looked dished? If so then it looks like you picked up a 03-04 motor. Pull the oil pan and see if it has H-beam rods. That will be the final answer to you question. And I also don't see knock sensors so I don't think its a GT block.

 

as discussed on SVTP, the lack of 6 bolt mains says it's def not a cobra block...and the termi's were not the only 4v iron block, the navi's had them too, but not likely to confuse that for a cobra shorblock...

 

The navi's are 5.4s but the aviator is a 4.6

 

the aviator also uses an aluminum block, not iron...

 

It's a 2v block, the great guys at svtp did excellent detective work and figured it out.

 

What were the indicators? My understanding is the 4V Iron block was not a 6 bolt main block. I have an '03 Cobra Iron block at home and i'm pretty sure it is 2 bolt main with side bolts.

 

^^ +1
i have one

its a WAP block

 

yea and unless my eyes are decieving me i dont see the center counterwieghts on the crank...
looks GT to me

 

REP short block

Made in Michigan.

If you look on the front right side of the block you will see multiple line of numbers. Those will indicate date the block was machined and piston / crank grades.

 

So it wasn't the block that determined it, it was the obvious lack of a steel crank and Manley rods.

 

So, could a 2V or WAP block be used with 03-04 4V heads?