3999289 bbc block?
#3
Senior Member
DYNO OPERATOR
Join Date: Jan 2004
Location: central Illinois
Posts: 459
3999289
Best 454 block other than 4 bolt #289 and #512 which are too expensive to buy usually.
I use 2 bolt #289 blocks for 750+ HP 496 bracket engines without issues.
Suggest ARP main studs and line hone for drag race use.
I still have about 6 complete 454 1970s engines saved back just for 496 engines.
About any MARK 4 454 block will work good.
I use 2 bolt #289 blocks for 750+ HP 496 bracket engines without issues.
Suggest ARP main studs and line hone for drag race use.
I still have about 6 complete 454 1970s engines saved back just for 496 engines.
About any MARK 4 454 block will work good.
#6
Originally Posted by hink
Like with any OEM GM block its best to sonic test for cylinder wall thickness.
#8
Senior Member
EXPERT BUILDER
Join Date: Nov 2003
Location: NORTHEAST
Posts: 290
Re: 2999289
Originally Posted by markdunlap
Hink
Ever find any early 454 BBC #289 or #959 blocks with enough core shift to matter for over bores .060" or less?
Ever find any early 454 BBC #289 or #959 blocks with enough core shift to matter for over bores .060" or less?
I have seen a lot of blocks that show a lot of core shift if your going by the front cam journal and the cylinders sonic test fine. On the other hand I have seem many blocks that show perfect core shift and fail a sonic test.
496 seem to be pretty common and I have seen early and late blocks fail for a 060 over bore.
Being a production block they all have to be checked before any work is done.