what is a drill mod

[Blackbird WS6]

what is the drill mod and how is it done, im new to this wed site and the ls1, i use to have 1- 1969 and 2- 1979 all 3 were show cars

[Y2KPewterSS]

http://www.installuniversity.com/ins...sity/index.htm

[INMY01TA]

More specifically: http://www.installuniversity.com/ins...r_cylinder.htm

[JwMonE99]

Would all that work the same way with an LT1?

[Wesman]

Would all that work the same way with an LT1?

LT1 cars don't have the line restriction, so therefore the drill mod is not necessary.

[01c5vert]

I still dont get what the purpose of it is?

[Blackbird WS6]

same here, it look like alot of work is it worth doing it