428 crank in 390 Need info.

[brents 67]

I recently got offered a 428 crank to put in my 390 . I need some info on the pros and cons of this. And tips on what to do or not do if I go this route.

[ok68crewcab]

I believe the 428 crankshaft is externally balanced where as the 390 is internally balanced so you will have to address that. A 390 with a 428 crank, is that basically a 406 or a 410 cubic FE?

[court1100f]

Actually I was doing calculations to this effect last night and a 406 is a 428 block with a 390s 3.78" stroke Crank and a 410 is a 390 with a 428s 3.98" stroke Crank so you would have to get the right Pistons BUT a 410 is a BAD ASS engine and would definitely be worth it

[390F100]

I'll take it if you dont want it...

[BobbyFord]

You'll need the externally balanced flywheel and harmonic balancer if going with the 428 crank.

[convincor]

the 428 crank can and should be internally balanced same as the 390 crank when used to make a 410.
and if your replacing pistons this should be done reguardless. It will cost a little more than std. balanceing because they will need to use heavy metal(mallory) to get enough weight.
more on the subject-
http://www.fordification.com/forum/view ... =428+crank

[mrtleavitt]

Go for the crank swap!!! You will need to adress the flywheel balancing issue. The harmonic balancer is the same as any balancer on a 390, 360, 428, 352, etc. They are all neutrally balanced. You can either get a externally balanced flywheel (autozone has them available for around $100) or get the crank balanced. If you can find someone to balance the crank go that route but I know that many shops don't like to do that on the 428's so they might suggest the off-set flywheel.