Originally Posted by blacksleeper
I was trying to think outside the box. If a person wanted to use the stock block,and money and time invested in clearancing weren't an issue, what kind of crazy sh#t could a person accomplish. How about a 4.375" I've always heard only 4.250" also, but I wanted to see if anyone has pushed the envelope.
I have a 4.5 stroke in a stock GM block. Made 900 hp on alcohol. There is some grinding invovled but then again your saving 2500.00. I personally think the purchase of a Dart block is money well spent. If you do decide to go with a stock GM block use a tall deck. That way you can use a longer rod. 4.5 stroke 4.375 bore is a 540. My block has no sleeves. I did fill the block with cement though. Ill probably go to a Dart block next year and 4.625 bore. One other small gain to a GM block is I think there about 100lb lighter than a Dart block.