I've decided to start a new thread, one of the many LIM porting threads, incase I run into any trouble.

Agrazela hooked me up with an LIM, and here it is:





Pretty good shape, but I'm going to clean it after I do the porting. I figured this way, there can't be any stray metal shavings in there anywhere when I go to install.

So, I've outlined the ports with sharpie, and I'm going to scratch off the area that needs cut out. Problem is, how to you find the center of the port, and accurately measure how much needs cut off each side? How do I know the port isn't off center from the port on the head already?



Also, some of the dimensions already exceed the measurements willwren got from the heads. But I'm assuming that'* typical for that area of the port?





I want to do this perfect so I don't have to waste my time/money working on this AGAIN, and I can devote it to the list of parts I have sitting in my room that need installed.

At it'* widest and tallest, it'* the correct dimensions. Clean out the corners and edges to those points. Smooth out the roughness all the way up after that, including the injector boss, but don't enlarge that.

So then I really don't want to touch the top and bottom lines, other than to smooth them, right? From the looks of it, a lot of material can come off of the top left side.

i thought the end result for a head match was 1.900 by .900?

is that LIM 45 and 23 thousansths over before you started?

That'* what I thought. I haven't touched it yet other than with sharpie.

ive only had time to finish a whole 2 ports on the LIM i am porting, so im far from an expert. but all 6 had about 80 thou to get to "the magic #*" of .9x1.9

so going from those specs ur at, i would just smoothe em out as bill said.

I do have to widen the upper part of the port, as it only measures .823 ish.

That LIM actually went from Boosty to TJ, and it was coming to me, but I sold it to putertopia instead without ever having seen it myself...glad it looks good!

In my experience, there are certain "spots" in the up-down and side-side of the LIM ports that are already larger than the head port dimension. They seems to be right at seams in the casting. There'* nothing you can do about those...just make sure you don't go over 0.9" by 1.9" anywhere else.

As for locating the porting...in my case, I had a set of heads on my bench to mate the LIM to; sans that, I guess you have to take your current LIM off and do ALOT of careful measuring...

(Note, if you want to do this before removing your current LIM, you can usually buy a set of cylinder heads--especially L36 heads--for around $100 shipped on various forums...use them as a guide then resell them, or port and polish those, too and install them )

Yeah, I could buy a set of heads for it... but I think this LIM will be good enough for me. If I ever figure out a way to buy an SSE/SSEi (or a dead se for cheap and drop in l67), I'll consider that. But until then... I'll stick with the areas I'm familiar with, or whenever I get a chance to go to a meet where people are ten years familiar with this motor lol.

Well the porting is done... now I just need to find a bit to smooth it out on the inside. The wire wheel didn't last long...

Here are the pictures:





And... are you sure this is tolerable? This is even before I touched the thing with the bit to smooth it out a little.