Is it a 454 or 427 BBC

[probablecause]

I have a bbc engine with a casting number of 399289 and was told that it was a 427. However, I have been to several engine sites that say that it can also be a 454.
The pistons are TRW forged Part# "L2239NF .30" and the crank has a part # of "6223". Is there a way to tell which one it is?
Paul
Paul407@aol.com
[ July 31, 2002, 07:09 AM: Message edited by: Paul407 ]

[Hotcrusader76]

Paul407:
I have a bbc engine with a casting number of 399289 and was told that it was a 427. However, I have been to several engine sites that say that it can also be a 454. Is there a way to tell which one it is?
Paul
Paul407@aol.comIts definitely not a 454! I bounced the numbers with my sources. Its gotta be a 427

[Jordy]

All depends on the stroke. The bore is the same between the 454 and the 427. Accoring to Mortec.com it is a 454. But if the motor was ever apart, a 427 crank could have been put in to it with no major issues.
427 = 4.250" x 3.76"
454 = 4.250" x 4.00"
Jordy

[Jordy]

Off mortec as well:
399289.....454.......73-79
Mortec
Jordy

[Hotcrusader76]

jordanpaulk:
Off mortec as well:
399289.....454.......73-79
Mortec
Jordy I am going by the casting list index book for BB Chevys.
Note- LOL...it does say that block casting numbers aren't 100% reliable..WTF! Right on the index of the book.....So why did I buy it then???? HHHmmmmm LOL...
But yeah you are right, its the same block, different stroke....Thanks Jordy
-Ty
[ July 30, 2002, 09:29 PM: Message edited by: Hotcrusader76 ]

[Blown Cheyenne Hydro]

is it internally or externally balanced??
internally....427
externally....454