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Old 08-01-2002, 12:08 AM   #1 (permalink)
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390 to 428 stroker?

I've gotten some mixed info on whether this can be done or not. Wondering if it's possible here, and also wondering where I could get a stroker kit for the job.

Thanks in advance.

Ron
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Old 08-01-2002, 01:12 AM   #2 (permalink)
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390 to 428 stroker?

Are you talkin FE engines? If so, some 390's can be made into 428's, but not all. The 390 has a 4.05'' bore and a 3.78'' stroke. The 428 is a 4.13'' bore and a 3.98 stroke.

If you wanna upgrade to more cubes, you actually have 3 options.

First being a 410, which can be made from any 390. Uses the same 4.05 bore, but uses the 428's 3.98 stroke.

The second is a 406. Thats where if you have a block that is capable of being bored to the 4.13 of the 428 piston but still uses the 390 crank. 406 was the predesessor to the 427, and was available in 63 galaxies as a factory tri-power. Awesome cars to see one fixed up.

Anyhow... The final step is of course the 428. you will need to bore your block .080 over, and locate a 428 crank. To see if your block is able to take the bore, you need to look for a casting mark below the driver side cylinder head on the front of the motor that is a mirror image of a 105. That indicates it was cast as an FT (ford truck) block, and as such, has more meat in the cyl. walls, and also has the extra main webbing found in the 428 blocks.

If you don't have that block, and are close to vegas, or dont mind the shipping, I have 5 of em. Gimme a shout!

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[ This Message was edited by: Luv70sFords on 8/1/02 1:14pm ]
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Old 08-01-2002, 01:46 AM   #3 (permalink)
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390 to 428 stroker?

Boring the 4.05 bore to 4.13 is a very touchy subject.The block should be sonic checked to see if theres enough meat to do this as there is really no other way to tell.A couple of cylinders might be ok and then one will be too thin.Personally I'd just put the 428 crank in the 390 block and build a 410.This will give you the torque of the 428 and the cheap availability of the 390 block.
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Old 08-01-2002, 09:45 PM   #4 (permalink)
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390 to 428 stroker?

www.flatlanderracing.com

they make a 430 stroker kit for the 390. its about $1800. This is the best way to get the size you want.
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Old 08-02-2002, 08:53 PM   #5 (permalink)
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390 to 428 stroker?

or you can get a 443" stroke crank for a 390 from http://www.dscmotorsport.com/crankshafts.htm for $375
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Old 08-03-2002, 02:50 AM   #6 (permalink)
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390 to 428 stroker?

I see they have 428 cranks for around $450 ready to go.If you bore the block .030 which is standard in most rebuilds you will end up with a 416 so your only losing about 10 cubes (428s were actually 425 cu.in I believe).This will enable you to use all ford parts and not have to search for custom pistons and stuff now or down the road.
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Old 08-03-2002, 03:20 PM   #7 (permalink)
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390 to 428 stroker?

By the way the flatlander kit depends on a crankshaft that doesn't even exist, SCAT has been saying they will cast the crank in 60 days for the last two years, SCAT also hasn't even set a price for the crank yet, it's a long way off IF they even deliver seeing as so far they haven't cast a single crank for delivery yet


http://www.network54.com/Forum/messa...eid=1028307688
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