Originally Posted by an8sec70cuda
Just a few things I can think of right now that I've seen from running my own stuff...

1. A vacuum pump only helps w/ oil leaks on a mid 9 sec NA 572. Saw zero performance difference, but it did stop the little annoying oil leaks. Had low tension rings in it too. Might work better on other combos, but I certainly don't think it's worth it.


Chip,
Everyone's experience can be different on this.

On my 700 hp 346 inch small block the higher you crank the vacuum the more horsepower you get. My memory fails me on the specifics but I think at 10" its worth about 10 HP and if I went to Pro Stock territory over 15.

My biggest issue has been getting the engine really sealed up to hold vacuum. I ended up getting a cheap smoke system to test for leaks to prevent the dreaded dyno embarrassment.

That all being said I have seen many knowledgeable folks like yourself with experiences exactly like yours. However I think its something anyone serious should at least try, especially if they have a light ring pack.

Bill