Edelbrock Heads for 318

The intake valve that works the best is the shape of the stock straight stem 84-90 with a backcut, this valve isn't a nail head or a tulip, it is how ever half way in between. I have flowed nail head and tulip valves and undercut ones and I thought that if I could get a valve half way in between that it should and could flow the best. As for the exhaust the valve that works the best here is the early 68-72 valve as it has a slight undercut and not a full undercut as the new valves have, and is also a semi tulip shaped valve and is worth 30+ cfm's on just a valve change in lifts above .500 even at 1.50 and not 1.6 but is better regardless of valve size that is used. The thing that hurts the 1.88 valve is that it's a full tulip shaped valve and reduces the port volume and port flow at low and mid lifts, most people don't run lifts high enough to get any value out of this set up, let alone the port is too small even for the most ported out port in a 318 head. The best that I have ever pulled out of a 318 head with a 1.88 valve is 218 cfm's where as the 1.78 has been as high as 232 cfm's and 220 cfm's at .400. The problem with the 1.88 valve head is that the port isn't as efficent and by useing the 1.78 valve made the port efficent and the velocity was way better and worth 20-30 HP stock and 50+ when ported. IMO