Jerry thanks for your idea but that was the first thing it did----- Please remember that AFR is looking to making a sale a new heads not suggesting taking used heads to a locals machine shop and have then refurbished, I am in sales and I always go for the new sale. I was looking to get some opinions on the flow characteristics and overall performance of AFR 210 old heads versus new AFR 195 heads. Will I lose a ton of lower end performance, will I have stalling issues, will I have to wind it up to 7200 Rpms to get it to come to life? This is a street rod. I don't care about losing 3/10 of a second from stop sign to stop sign. Just trying to keep a good pull from 2500 too 3000 Rpms on.