[CentOS] is there an apache limit on submit size for centos 4 and 5

Is there a limit to the size of the form that apache will accept?

I have a small import utility (not php - just straight cgi and C program).
It will import smaller files. 350 Meg is the largest I successfully did.
But a 6.5G file it will not do. Seems like the form does even submit.

Is there a config option in apache that doesnt even accept it?
I looked at /var/log/httpd/ error and access and nothing is there.

Any ideas?

Jerry