Old post from 2014 from Steve.
"My 577" is a '59 389 with a .315" over stock bore and stroked 1.050"! This was done around 20 years back in an effort to have the largest Pontiac ever. The problem with boring out the stock cylinders is that the deck is not strong enough to support it. I learned this from Ken Crocie, he had told me he had tried it years earlier and the decks lost so much strength, it would not work.
The way I made mine work was to use deck plates that raised the deck and added the support needed for integrity. I ordered custom extra long sleeves to accomplish this. Again, this was very expensive and time consuming and before the aftermarket blocks were available.
If you can access a boring bar to use as I did, you can try all sorts of things but, as others said, you are better off seeking a 400 block."
I know he showed pics and all but I cannot find it right now. Hopefully he weighs in. Ahead of his time here.
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79 Trans Am WS6
71 Formula
72 Formula
71 Firebird
69 Firebird
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