I have 540's already. Im buying new rods new pistons for them. Ifiguer with the left over buid a short block and sell it. Im not looking to build another from scratch just put something together to sell.
-Mike

I used to build tall deck 427's for my flatbottom SS race boat and we found on the GM 427 blocks they did not like more than a 4.280 bore and a 4.125 stroke without seriously notching the bottom of the block around the pan rail and cylinder bottoms. This was tricky with early castings with the oil galley down on the pan rail. This gave 475 cubic inches and thats about all you will safely get out of an old 427 tall deck block. Your 502 rotating assembly is sized at a 4" stroke and a 6.135" rod only so your not gonna get anywhere near that 540 doing that way. Sell that tall deck 427 block to someone that needs that particular block.

Best Regards,
ray @ Raylar

Thanks Raylar i didnt get the block yet only located one. All i need is the crank and block to make a decent 540 set up i have the pan rods pistons harmonic and can grab a nice set of heads for the right money also have a decent manifold and rockers to put on it.
-Mike