390 to a 427?

[dadstan76]

My nephew is trying to tell me that he built up the 390 in his truck up to a 427. I think he is full of it. How would that even be possible?

[kernel-panic]

Only way I'd know of is to swap engines or blocks, unless a 390 block can be bored out to 4.230" from 4.050" (.18") I don't know of a stroker kit for a 390

[85e150six4mtod]

You can make a 410 out of a 390 with a 428 crank. That is pretty much what Ford did in '67 & '68.

You can use other stroker cranks to get the 4.05 bore out to 445 or so, with an .030 overbore. Read the FAQ's at the top of the FE forums and you will find a .060 overbore is questionable in some blocks. A .180 overbore is not possible. I doubt he sleeved it for that bore.

Then there is the matter of the mains. 427s got cross-bolted mains, 390s did not.

Then there are heads, and the valve train, starting with solid lifters for one.

You can make a 390 into a 400+ engine, but it is not a "427" as Ford built them, and won't be no matter what you do to it.

So, find out what he did, and then you'll know what he's got, but it isn't a "427" as issued by Ford.

[393STROKER]

4.050 x 4.050 x 4.150 (Eagle crank) x 8 x .7854 = 427.6
4.130 x 4.130 x 3.98 x 8 x .7854 = 426.5 It`s possible if you juggle the numbers just like your income tax

[guitarnik]

anything is possible. i think someone on here has a 420 stroked 351. dont quote me on that but its close to that.

[Homemade]

you can almost get a 430 ci 351 winsor but there are aftermarket blocks and other factors so its hard to say who has what nowadays.

[RapidRuss]

One way to tell if he's stroked it...is pull a plug..and measure it with with a dowel in the hole with the piston at BDC and again at TDC....Mark it in both positions...and see what the stroke is..

[Smasher O'Brannan]

gee wiz.......a 351w can be stroked over 427c.i..in fact the 427/351w is a very popular stroker kit. I have one in a 66' mustang coupe (wifes car)...big block power...small block weight!......Hers dynoed at over 500 hp. 430lbs tq. Not bad!......I have a stroked 390fe also in a 49' hudson sedan that specs out at 445c.i also..(mine!)......and theres my 73' mustang coupe that i drag with......552 cubic inches from a factory ford 460 block.....wanna learn a little more?

[RapidRuss]

O'Brannon,

Whatcha doin Slummin over here ?? LOL.. Dont give all our secrets away !!

BTW Reps too Ya !!

[kenjh]

Originally Posted by Smasher O'Brannan

gee wiz.......a 351w can be stroked over 427c.i..in fact the 427/351w is a very popular stroker kit. I have one in a 66' mustang coupe (wifes car)...big block power...small block weight!......Hers dynoed at over 500 hp. 430lbs tq. Not bad!......I have a stroked 390fe also in a 49' hudson sedan that specs out at 445c.i also..(mine!)......and theres my 73' mustang coupe that i drag with......552 cubic inches from a factory ford 460 block.....wanna learn a little more?

so your 445 how is it holding together??any issues,an' whoes kit?

[78ltd]

428 crank with .030 overbore turns a 390 into a 416.27 ci.