Lotus 907 vs 340 Buick

[roverman]

Hi, Perhaps someone out there has cfm. flow specs for these two heads. In standard form or up-sized.? 1 mm. oversized int./exh. valves for 907 are readily available. Have not flowed this set-up yet. Looking at 1.89" int. and 1.5" exh. on 340" head.  Thanks, Art. G.