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I am doing a build up on my cobra block. I wan to know if it is safe to go .030 over on the stock sleeves. or should I just do .020 over? I am going to be running a Vortech blower on 10-12 psi. all forged internals, main girdle, ARP everything....no shortcuts here. Chris
 

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I would recommed .020 , you can go .030 but to me its not favored on the aluminum blocks. It is the limit though and you would probably be fine. PS the main girdle is a waste of cash for your HP range. I make over 600 and have seen many 03 cobras making more that that. The caps are not going to walk at our levels. Not a shortcut....just saving money ...not pizz it away you know.
 
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