Nigel the flow sheet you posted is from the heads i sold to jamie. you must have found the picture of it in that for sale thread. I just realized that or i would have spoken up sooner. the link below has the correct flow numbers. http://www.v8buick.com/showthread.php?t=81330&highlight=critique
And they are still on the car as of 2 hours ago:laugh: I need to fire that thing up this week & post a sound video of it with the open M/T headers:laugh: