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Discussion Starter #1
Hi!

I have a Ford FE 390 with a broken crankshaft and I could get a new 428 crank with bearings. What should I do with the adittional parts: pistons, rods.
Which can I use from my 390 FE?
I know that I have to have internally balanced the 428 crank.
Can I use the 390's rods with new 410 Mercury pistons?
Can I just cut some material from the top of the 390's pistons to use with the 428 crankshaft?
Thanks!
 

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The 410 is a 390 with a 428 crank. You shoud have no problem using that crank. If the crank came out of a 410 then the piston sizes are the same, 4.05 . If you use the flywheel and damper that the 428 crank originally used, you don't have to balance it. If you use a different flywheel and damper then you will have to balance the crank to the new hardware.
You can use the 390/410 pistons on the 428 crank, just check your piston to deck height clearances. i wouln't cut the pistons down to fit....you should have no problem with clearance. I don't know what size cam your using but if it's bigger than stock ie: .600 lift or more clay the pistons to make sure the valves don't hit the pistons.
 

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Discussion Starter #3
Thank you for the info!
Why do you think I can use the original 390 pistons with the 428 crank?
The 428 crank has more stroke than the 390. I thought with that crank my pistons would hit the heads.

The 410 is a 390 with a 428 crank. You shoud have no problem using that crank. If the crank came out of a 410 then the piston sizes are the same, 4.05 . If you use the flywheel and damper that the 428 crank originally used, you don't have to balance it. If you use a different flywheel and damper then you will have to balance the crank to the new hardware.
You can use the 390/410 pistons on the 428 crank, just check your piston to deck height clearances. i wouln't cut the pistons down to fit....you should have no problem with clearance. I don't know what size cam your using but if it's bigger than stock ie: .600 lift or more clay the pistons to make sure the valves don't hit the pistons.
 

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The 390 and the 410 have the same bore 4.050. The pistons will fit in the bore just fine, you might have to use the 390 rods. install one piston with the 428 crank and if the piston is below the deck at .200 or more then I would use the 428 rods. The .200 is the difference between the 390 carnk and the 428 crank.
 

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You can not use a piston from a 390 in a 410. The rods are the same lenght, but the pistons have a differnt compression heihgt, that is from the center of the wrist pin to the top of the piston. You MUST find the 410 pistons.
 
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