Assuming you can play, write a "massive" sounding guitar part, know how to dial in a "massive" sound on your rig, a massive sounding guitar is the result of:
1.) Expensive amplifiers, usually tube. Think Bogner Uberschall, VHT Pitbull, and other pricey boutique amps.
2.) Expensive, well set up guitars, often vintage. Definately not the lame Schecters they sell at Guitar Center.
3.) Yeah you can get an okay tone with an SM57, but the big dogs are rolling with expensive mics like the Royer R121's, Neumann U87's and the like to record guitars. Usually more than one mic and in an appropriate recording space; i.e. your room doesn't suck.
4.) Expensive preamps. I'm talking at least
UA 2108's, but along the lines of Vintech 473's, Neve 1072/1073 series,
Universal Audio 2610's.
5.) Lots and lots of *PERFECT* takes piled on top of each other. There are albums that have 3 takes left, 3 takes right and 3 takes center. Yeah, it can take a long time to get right.
6.) Really good mix that makes the guitars sound heavy.
7.) Really good master that continues to accomplish the above.