Hey All, just a question that some of you might have an opinion on. (there are some opinions here if I recall.) My 340 is pretty well sorted at this point, tuning etc. I have a true 9:1 motor, Lunati solid .526/.546 lift cam, port-matched LD340, big Thermoquad, etc. Cope built 518 OD with 4.10's. My heads were ported/polished and really worked over by Bob Mullen way back in the day. (apparently he designed the W-2 heads?) I've been running 1-5/8" mid length headers that I made from some long tube ones years ago. My question is about what size primaries you guys might suggest. (I expect some differing opinions, but that's fine.) Since I can't do advanced math to figure port area, I took some used header gaskets and carefully formed some wire to the port outlines, then rebent the wire into a circle and it came out at exactly 1-7/8" I.D. I'm thinking that's a lot to try to run into 1-5/8" (...even though I did do some port-matching so there's no sharp edge dam, but it's more of a rounded transition.) Fitment not an issue as I may make my own, or am game to modify some existing ones. Street/strip use. Ideas???