I don't have much luck with growing large tomatoes, even though I am facinated by them ;I stick with the Romas and cherry types, Marion always does well for me even though they are never very large. I am inserting some links to some sites that have info on growing the big boys. Good luck and let me know they turn out.

http://www.geocities.com/giantveggies/main.html

Here is a link that might be useful: Growing giant tomatoes

Here is a good address for all types of tomatoes and unusual peppers. They have a great variety and also have the large type tomatoes like 'Morgage Lifter',Giant Belgium, etc. The name is Tomato Growers Supply Co. and their web address is
www.tomatogrowers.com

Here is a link that might be useful: Tomato Growers Supply Company

The world record is held by an heirloom - Delicious.
Jim