My take on the oiling system crossover tube for the small block

Alex5280 said

Wanted to say Thanks for posting the videos. I am doing most the the GJ oil mods now and seeing you drill bit "walk" and ruin the block is concerning. I had planned to drill the mains to the oil galley with a 9/32" bit....is there a way to keep it straight to avoid drilling offline??? Is it better to have a machine shop drill these??? Thanks Guys!

Click to expand...

As for the shop vs. at home, I guess it depends on your tools and experience.

The main thing for getting the drill to follow the existing passage is getting the hole started straight, and the tricky part is the fact that the oil passage does not go at a 90 degree angle to the web surface. We had success doing as described in the 1st paragraph of post #110.