GM’s LS7, the engine that came in Z06 Corvettes, was factory equipped with a dry sump style oiling system. I say dry sump style because the system they use isn’t exactly the same as a race style dry sump, but does give improved oiling in high G road race scenarios. Because the factory system still picks up oil in the bottom of the pan, with a standard pickup, and has only that one suction stage, it isn’t quite up to snuff compared to your typical 3+ stages of suction on a standard dry sump. But what if you get your hands on one and don’t want to have to figure out the packaging and oil tank location in whatever you are swapping it into? Converting an LS7 over to a standard wet sump is as easy and acquiring the right LS3 parts, but there is one thing missing. GM never drilled the hole for the dipstick in an LS7 block because the dipstick is in the oil tank.
Thankfully, the guys at Holley have a new drill guide just for you folks who want to do this conversion.
Not only is it a bolt-on drill guide that allows you to use a hand drill to get the engine ready for a standard dipstick, but it also has a cool groove machined in it that allows for a shop vac to suck out the chips while you drill it!
Check it out.