I believe you to be a man of action, so you have probably already started working on this.
The two things I remember from the article were:
1) Check clearances without the head gasket installed (even the old crushed one). This will give you just a little more PtV clearance as insurance.
2) Don't cut too much out. Just what you need, as any cutting weakens the pistons.
I will dig at the office tomorrow. The tool they used looked a lot like a cutoff wheel for a die grinder. You slid it through the valve stem hole and used it during your measurments. When things don't clear, you attach either a die grinder or a held drill (don't remember which) and grind.
The other thing I remember is that is it a lot of work, time wise. The other option is to pay someone else to do it. Lots of labor = lots of bill.
Well, didn't find the magazine at the office, which is making me seriously doubt my filing system . A quick net search shows that the tool described in the article is most likely an Isky piston notching tool, which you should be able to find here. The network at work is being uncooperative this morning, so their website is not loading (NMCI, if you know what that is -- if not, count yourself amongst the lucky).
Here is a discussion about doing it your self. They strongly recommend re-balancing the engine after you are done cutting, as it is not humanly likely you will take the exact same amount of material from each piston.
Just did this to my 351, used a home made oversized valve with welded on blades.
are you doning this with an assembled short block?
I put tape all around the slug and the ports to keep the shavings confined. Shop vac handy.
I also used the same head champer on all my pistons
Don't forget radial clearnce too
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