I've started to fill out the two charts in the attachmets below.
if anyone can help fill in the blanks it would be a big help.

any side by side photos would be a help too.

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EF Forged TRW rod on the left, XF (late forged) on right



the XF one 'looks' good in the photo. It is how ever lighter the EF rod, the XF rod is lacking metal in the beam and has a lot of weight in the balancing pads compared the EF rod.
the little end of the EF rod is some 20grams heavier despite having a smaller balancing 'pad'
I don't have scales here that will take the weight of the big end or the whole rod. (i'm working on that)

The quality of machining is also very poor on the XF rod

There is alot of talk about the last of the cross flows and the first of the OHC engine being produced side by side, There has also been reports of some of the early 3.9 engine being fitted with rods that have F 250 on the side, denoting the rods as being a crossflow rod.
The late XF rod is a better rod then the early 250 rods, and may be a result of ford tooling up to start production of the OHC engine.




It looks as though i have scored a free AU VCT engine (over heated) so hopefully i'll have a comparison after xmas.

XF vs EF XF on right EF on left


EF vs BA (lpg) EF on right BA on left

OHC I6 engine with 3.7inch Manley piston and spool 6.060 BA rod

with a 64cc chamber
Zero deck
an AU head gasket
93.98mm bore (3.7inch)
99.31 stroke (stock stroke)
Comp ratio = 11.21:1

as above with pre AU gasket comp ratio = 10.58:1

engine capacity =4.134L / 252.24cui
bore/stroke: 0.946
stroke/rod: 1.550 (6.060inch Spool BA/BF rod)

great thread mate
i always appreciate info like this. cant get enough of it!
would be fantastic to se a comparison of all variations of each model (ie EL hybrid as an example not just EL) as im sure as you have suggested there would be a few bitsa motors getting around.

the above rod/piston combo sounds like a fantastic speedway option (or i guess a few hot street n/a engine lol).
i would love to see someone do an n/a engine running methanol with some stupid high comp. would be very interesting!