brocks install, i think i goofed?

[hemi]

just silicone'd my megaphone pipe to the collector pipe bc it was leaking a little, problem solved. Got to thinking about it when i did the install. I applied silicone to the spigots of the head pipes that bolt to the block. The directions weren't all that great, but i think i was supposed to remove the spigots and silicone the head pipes, then slip them over the spigots. Have about 500 miles on the system so far and don't hear any leaks, think i should be worried about it? I would hate to pull the system back off