hot_XD_falcon

Hey guys, just wondering if anyone has heard of or has experiance with using an EL-EF crank with 3.9L or 4.0L rods and pistons fom an EA-EB falc in a 250 crossflow..?

I have heard that the EF crank and EB pistons and rods are stronger than the stock 250 parts, but what mods are required to use them to make a stronger 250 donk....

Also I think ive heard of this combination being used in turbo applications for the extra strength..? Any truth to this..?

Any advice would be great

Cheers...

oldwagon

I am told an EF crank will fit the LAST of the XF blocks (87DA----). Have a look around fordsix.com (the aussie 6 section).

ebs_4l

ive heard of the swap going the otherway, using the 200 crank in a 4l, making a shorter stroke for more rpm.... so im only guessing it does fit backwards

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eb6, t5, stg3 crow, chip, ceramic button clutch, pacemakers, 2.5in stainless, unifilter pod, ported head, thermos, pedders s/low, LSD.... 144.5rwkw so far

meethed

guess nobody really knows - I'VE heard you need an EL crank because it has different counterweights to the EF (and before that EA-D they were the same as a 250), and you use the 3.2 / 3.3 rods so it'll rev like a muther. I'm not even sure if they have a different stroke??

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MLS

You will need an 84DA block or later from a late XE or XF due to the type of rear main seal used.

Use an EF crank as they have 12 counterweights, compared to the 9 weighted cranks from the late x-flows.

Get a set of 200ci rods from a 3.3 XE, these are longer than the 4.1 rods

A set of pistons to suit the longer rods, you can order ACL brand through Repco or Bursons.

Just make sure you get it all balanced properly and you shouldn't have a problem with revving to 6500 reliably.

As for strength, I have personally seen this simple combination used for 250 rwkw and 7000 rpm so for your streeter it should be up to the task I'd say.