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-   -   .030 over 390 (http://www.clubcobra.com/forums/contemporary-classic-forums/106504-030-over-390-a.html)

seeda 09-01-2010 07:48 PM
.030 over 390
 
just a question....found the build sheet for my engine and said its .030 over. what does that mean for the ci size of my engine? not a lot of other info for internals. its a 390. is it a 427 or a 428 now? forgive me for my questions but just trying to learn about my car and you guys have forgotten more than i will know about cobras!

redmt 09-01-2010 08:18 PM
Quote:
Originally Posted by seeda (Post 1075450)
just a question....found the build sheet for my engine and said its .030 over. what does that mean for the ci size of my engine? not a lot of other info for internals. its a 390. is it a 427 or a 428 now? forgive me for my questions but just trying to learn about my car and you guys have forgotten more than i will know about cobras!
I forget the exact calculations but you picked up about 2 cubic inches.

Dwight 09-01-2010 08:20 PM
if I calculated correctly you have a 395.359 ci FE.

http://www.avenger-valkyrie.org/tech...alculators.htm

a 390 has a 4.05 bore and a 3.78 stroke
a 428 has a 4.13 bore and a 3.98 stroke
a 427 has a 4.23 bore and a 3.78 stroke


Dwight

a good book on Ford motors
HIGH PERFORMANCE FORD ENGINE PARTS INTERCHANGE by George Reid
ISBN 1-884089-33-X

redmt 09-01-2010 08:23 PM
OK , so can about 2 be 5 and 5/16 ?

1985 CCX 09-01-2010 10:07 PM
Isn't this now a 406?

Rick Parker 09-01-2010 10:30 PM
About 396 CU IN

Excaliber 09-01-2010 11:25 PM
396??? Oh, thats a bad number, sounds to "GM" for my liking. Lets call it a 406, yeah, much better. :)

Dwight 09-02-2010 07:32 AM
406
 
a 406 has a 4.13" bore and a 3.78" stroke

Dwight

redmt 09-02-2010 08:10 AM
Quote:
Originally Posted by Excaliber (Post 1075502)
396??? Oh, thats a bad number, sounds to "GM" for my liking. Lets call it a 406, yeah, much better. :)
Call it what it is,,,, a 390 bored .030 oversized. Nothing more than a clean up bore.

Excaliber 09-02-2010 08:57 AM
Quote:
a 406 has a 4.13" bore and a 3.78" stroke
Eh, close enough, what the heck, let's call it a 427, no one is going to whip out the micrometers at the local cruise in. :)

rustyBob 09-02-2010 09:44 AM
Im with redmt........call it what it is........030 390 or one mean FE.......


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