So I figured with all this talk of porting a LIM, I'll try it out on my own as well.
This thread is not so much asking for advice, as I can find plenty of it just by using the search feature on this forum, but rather to show people what I've done and how much of a difference it makes. I'll do some 0-60 runs on my Passport G-Timer before and after. While some may a G-Timer is inaccurate, mine so far has been accurate down to .02 seconds in the 1/4 mile, tested and verified when I took the regal to the drag strip last year.
For reference, here are the times i had:
What I've gathered so far is that the last thing you want is to over-port the LIM, as that would cause you to have a lip at the LIM-head transition, and would cause turbulence as a result. IIRC, I need to make my ports marginally smaller than 0.9x1.9, and can use the LIM gaskets as reference point for finding the center of the hole so I know what I can take off. I understand that the concept is basically to port them just marginally smaller than the head openings.
I plan on doing this with a dremel, as I really don't have any other tools. I've been given the impression that using a coarse drum sander would probably work best in this scenario, though i have a few more tools I can use if required, and a small budget for buying a few more dremel attachments.
The thing I do need some advise in is smoothing the runners. Is there much of a gain to this? Also, what would I use to do it?
Thanks for the help. I'll be posting pics of my progress.