Stroke engine 3L - 4L. Is it possible w/o sandwich plates?

[miurasv]

Would it be possible to increase the capacity of a 3 litre 12 cylinder engine with a bore and stroke of 77mm x 53.5mm to 4 litres by increasing the stroke from 53.5mm to 71mm without using some form of spacer/sandwich plates and still using the same block? The compression ratio is 11.8/1. I read that somebody has done this but without some kind of spacer between the head and block wouldn't the piston hit the valves? If a sandwich plate is needed would it go in between the cylinder head and block or the sump and block? Actually would a sandwich plate work? How would you increase the length of the bore with a sandwich plate? Thanks very much in advance for any replies.