Its a 454!!! not 396

[jimmy'sjimmy]

just looked up the block numbers for what was sold to me as a 396 but it turns out to be a 454!!! anyone have info on blocks w/ #3999289? everywhere i looked on the net said it was a 454 any other way to make sure?

 

[k20]

measure the bore lol, if its 4.25 its a 454, if its barely over 4(I dont remember the exact #), its a 396.

 

[sled_dog]

hes right, the casting number is 454 not 396.

 

[k20]

yeh I got the same thing on a casting number search, but, if his casting #s are anything like mine, they are next to illegible. Also, says it is either a 2 or 4 bolt main, pull off the pan, see whatcha got man...

 

[jimmy'sjimmy]

i'll pick it up in a week or two, its still at the guys house. hes our diesel mechanic, he said it has a steel crank and shorty headers. he was going to put it in his firebird but the firebird already had a beefy motor, so he wants to get it out of the way. when i pick it up ill leave it in the shop so we can go over the whole thing. i cant wait

 

[diesel4me]

extenally balanced...

A 454 will have a "half moon" cutout on the harmonic balancer,and a weight on the flywheel(if you are getting it complete)--the other big blocks use a regular flywheel and non-counterweighted balancer..be sure you put the right one on if its a 454,or it will shake itself off the mounts...
Good score if you got a 454 instad of a 396!!