View Full Version : 3999289 bbc block?
robgbar
10-06-2013, 08:20 AM
Is ok to use this block in a mild build? Any reasons not to?
oldandtired
10-06-2013, 08:23 AM
72 - 79 454 with 2 bolt mains. Some "CE" replacement blocks had 4 bolt mains. I see no problems.
markdunlap
10-06-2013, 08:55 AM
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.
robgbar
10-06-2013, 09:00 AM
thanks guys, maybe its a go
Like with any OEM GM block its best to sonic test for cylinder wall thickness.
oldandtired
10-06-2013, 11:12 AM
Like with any OEM GM block its best to sonic test for cylinder wall thickness.
x2 I had a K block that tested dead center on the casting. We went +.100 on that one with no heating problems.
markdunlap
10-06-2013, 11:13 AM
Hink
Ever find any early 454 BBC #289 or #959 blocks with enough core shift to matter for over bores .060" or less?
Hink
Ever find any early 454 BBC #289 or #959 blocks with enough core shift to matter for over bores .060" or less?
Core shift really has noting to do with cylinder placement as I have seen many block that one cylinder would not pass a sonic test making the block useless for a performance build.
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.