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-   -   3999289 bbc block? (https://www.racingjunk.com/forums/showthread.php?t=33884)

robgbar 10-06-2013 09:20 AM

3999289 bbc block?
 
Is ok to use this block in a mild build? Any reasons not to?

oldandtired 10-06-2013 09:23 AM

72 - 79 454 with 2 bolt mains. Some "CE" replacement blocks had 4 bolt mains. I see no problems.

markdunlap 10-06-2013 09:55 AM

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.

robgbar 10-06-2013 10:00 AM

thanks guys, maybe its a go

hink 10-06-2013 11:33 AM

Like with any OEM GM block its best to sonic test for cylinder wall thickness.

oldandtired 10-06-2013 12:12 PM


Originally Posted by hink
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 12:13 PM

2999289
 
Hink

Ever find any early 454 BBC #289 or #959 blocks with enough core shift to matter for over bores .060" or less?

hink 10-06-2013 02:42 PM

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?

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.


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