from the looks of it it is a 4 bolt machined area just missing the second set of holes. wish i had a before and after of my block as far as the mains are concerned. and the engine builder sed aside from the caps i bought 4 bolt mains weakens the blocks ALOT. only thing it help with is cap walk. and if you just add studs it fixes that issue and is a stronger setup then any 4 bolt Besides the Bow Tie caps i have from the SB2.2.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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