so i bought this throttle body off ebay that has been ported and polished, before installing i noticed that where the four main bolts that hold it down there is a slight downward slope on the inner side of the bolt hole, so when i set there bolt in the hole there is a slight air gap, other than that i installed it and it performs great just wondering if i should worry about it or what i could do to seal it better. thanks nick

 

Nothing to worry about.

 

I've seen instructions for some modified throttle bodies (Big Gulp I think), and they note that there is a gap between the bottom of the bolt head and where the bore taper starts.
They suggest thumbing some silicone in the gap.

 

cool thankyou for the replies, ill keep an eye on it and possibly put some silicone, any idea what would be a good one to use.

 

Permatex Ultra Black would work well for that.

 

i used to have the big gulp and yes its like that because of the big bore. and yes they say to put a little rtv right there to seal it.

 

cool thank you will do