I are dumb. Random 390 question.. - 460 Ford Forum
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post #1 of 8 (permalink) Old 09-08-2009, 09:01 PM Thread Starter
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I are dumb. Random 390 question..

One of the cars that I am looking at has a 390 engine. It has a bunch of modifications, including a 427 crank. My question is this: Does that 427 crank (and I'm assuming matching rods) make it a 427? Or would it have to be bored out to accomplish that? I'm not familiar with the 390/427 engines, so I don't know if they share the same bore. TIA
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post #2 of 8 (permalink) Old 09-08-2009, 09:05 PM
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One of the cars that I am looking at has a 390 engine. It has a bunch of modifications, including a 427 crank. My question is this: Does that 427 crank (and I'm assuming matching rods) make it a 427? Or would it have to be bored out to accomplish that? I'm not familiar with the 390/427 engines, so I don't know if they share the same bore. TIA
No 427 crank does not make a 390 a 427, 427 bore is much larger
390 stroke is same as 427
Block on a 427 has more material to allow for the 427 bore

67 mustang street car, 1977 460, 212 degree cam, 2500 converter, 3.50 gears, RHP Edelbrock heads
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post #3 of 8 (permalink) Old 09-08-2009, 09:09 PM Thread Starter
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Ah. So what the hell does adding a 427 crank accomplish? Is it stronger or something?
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post #4 of 8 (permalink) Old 09-08-2009, 09:25 PM
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Ah. So what the hell does adding a 427 crank accomplish? Is it stronger or something?
If I remember right, don't quote me, but I think they're steel.
I'm not sure if they're all steel or just some.

67 mustang street car, 1977 460, 212 degree cam, 2500 converter, 3.50 gears, RHP Edelbrock heads
best ET 12.01, mph 112.98, 60ft 1.69

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post #5 of 8 (permalink) Old 09-08-2009, 09:36 PM Thread Starter
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Alright
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post #6 of 8 (permalink) Old 09-08-2009, 09:57 PM
 
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I think the 427 had steel cranks from 1965-67 and the others were nodular iron for 1963, 64 and 68. Also some 360/390 truck had steel cranks.

The 427 & 390 both had a 3.78" stoke and bores were 4.23" and 4.05".

The nodular crank is good for 6000+ rpm with a good tune and balance.

I had two and they saw 6000 many times back in the days. Most important is rods and rod bolts.

I am not an engine builder like the good guys on this sight but have put together a couple 427 center oilers engines.

Mike
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post #7 of 8 (permalink) Old 09-08-2009, 10:08 PM
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Good write up on building a "427"

http://www.fordification.com/poormans427.htm

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post #8 of 8 (permalink) Old 09-09-2009, 03:24 AM
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Quote:
Originally Posted by 545 87LX View Post
I think the 427 had steel cranks from 1965-67 and the others were nodular iron for 1963, 64 and 68. Also some 360/390 truck had steel cranks.

The 427 & 390 both had a 3.78" stoke and bores were 4.23" and 4.05".

The nodular crank is good for 6000+ rpm with a good tune and balance.

I had two and they saw 6000 many times back in the days. Most important is rods and rod bolts.

I am not an engine builder like the good guys on this sight but have put together a couple 427 center oilers engines.

Mike
Mike has pretty much nailed it, except that the 360-390 cranks were all cast, however the 361 &391 FT engines used in the larger trucks (Louisville, COE, and F500-600 etc) had steel cranks. However the361-391 truck cranks have a much larger front crank snout and pilot bearing flange, which need to be machined down to fit a car timing cover and crank gear, and car sized torque convertor or pilot bushing/bearing. The factory cast cranks are pretty stout, I run a .010-.010 cast 428 1U crank in my Fairmont, 14 years of low 10 second 1/4 miles, 66-6700RPM thru the traps, and it still always passes Magnaflux testing. A couple of buddys with 454`s (427 block with a 428 crank) have been running the stock cranks for years as well, trapping 7500 RPM!

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