After trying to locate a fix a pesky oil leak in a LS7 engine, it was discovered that there is a small crack in the block. I would be sad, any idea what caused the crack in the first place so I can avoid doing that ? I will try and get pictures from a co worker and details of his block that cracked when it froze on the way to a race in Atlanta.
I fixed one about 6 months ago on a ls3, the crack was about 3" long running vertical. Hmm, lots of ways to get that motor from a wrecked vette, insurance, theft, police auction, etc.
This head has been port matched and flowed to make sure it meets or exceeds the original flow.
I picked up a nice clean 3000 watt generator from CL with a small crack in the bottom of the crankcase that allows the oil to drain out slowly (fell off the back of a pickup).
Niper, Not to be rude, but would you be able to braze this for a customer for less than the $62 crankcase replacement?

I used JB Weld once, it was for filling crack on a ford 302 head it was leaking right front corner , It was not only the gasket, the engine has already 300,000KM so i did want to redone the heads, so I use JB weld and telling you I sold the van and the guy still running it with the repair and still not leaking.
This will avoid heat stress in the casting , and repairs can be carried out in which heat is not wanted . This kit offers the right epoxy, fiberglass and fillers to complete repairs to cracks and holes, gelcoat blisters, delaminated cored panels and more. Each Fiberglass Boat Repair Kit contains eight packets of WEST SYSTEM 105 Resin and 205 Hardener, fiberglass fabric, adhesive filler, fairing filler, glue brushes, mixing pots, a mixing stick, an application syringe, three pairs of protective gloves and illustrated instructions for completing a variety of common fiberglass repairs. All components are contained in a sturdy, resealable package that can be easily stowed aboard your boat.
Repair plastic canoes, kayaks and inflatables made from HDPE, LDPE, ABS, PVC or polycarbonate plastic with the contents of this kit.
I got the crankcase open & on first inspection there does not seem to be any cracking on the inside, so it may be going out the drain hole then through the cracks there.
I filled the cracked oil drain hole with JB weld and buttered up the drain plug before screwing it in.

Plus I only have a propane torch so it would take a while to heat such a large mass, if it was possible. Illustrated, detailed instructions explain how to repair leaking seams and rivets in aluminum boats.
Also included are a 2" x 10" piece of 9 oz fiberglass tape (useful for patching, reinforcing or abrasion resistance), an application brush, mixing stick, pipe cleaner, two cleaning pads and complete instructions. We are donating $10 of each blue star subscription to the Blue Ribbon Coalition to ensure that we will have trails to recreate on for years to come. I'm hoping maybe Devcon, JB weld or some metal epoxy?The motor is a clone, Lifan 168F2 196 cc and parts seem to be quite rare. Plus I am too lazy to strip it right down to the casting so I'd be worried about how the heat would affect the other components, bearings & gaskets.

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