Workmonster Racing Engines     |   home                      Porting 30 Well, there you have it. I do not like to quote air flow numbers, 'cause they are too subjective, and too easy to fudge. I have tested many sets of heads from big time porting shops, and many do not come close to the figures quoted in their ads. The particular set of heads shown in this site had an average increase in intake flow of over 30%, and exhaust was over 50% better than stock. I would be glad to answer any questions you may have, although it may take me a while to get back to you. Thanks for looking!