frame notching

[TXsilverado]

so, I have the tools to do the job, but I'M not experienced in this area at all.

I need to notch the crossmember on my 69 Camaro to make room for the alternator. before anyone asks, no I cannot use different accessories.

the engine is currently bolted down, and it's sitting on the front tires. my questions:

1) do I need to get it off the front tires before I start cutting, or can I cut out the material while it sits on the ground?
2)what thickness metal should I use to box it in after cutting out the material I need out of the way?
3) any pro tips/tricks I should consider before I start hacking at my crossmember?

i'm looking to do something like this:
https://static1.pt-content.com/images/pt/2017/04/ly6swap267JPG-1.jpg

[raustinss]

First question would be why can't you use different accessories...
The engine will probably need to come in and out a few times ...cut... test fit ..cut test fit
10 Guage should be strong enough... or go overkill to 3/16" . As for tips... take your time do it right

[TXsilverado]

First question would be why can't you use different accessories...
The engine will probably need to come in and out a few times ...cut... test fit ..cut test fit
10 Guage should be strong enough... or go overkill to 3/16" . As for tips... take your time do it right

it's a ls swap with a kenne bell blower on top that requires gen 5 Camaro accessories.

I have enough room, and the car is high enough in the air to do all the cutting and welding from underneath with the engine in place unless you guys think the extra weight of the engine/blower might make something move around...

I figure since my motor is bolted in with solid mounts, it may brace everything even more from moving.