Leaving it along porting wise I'd agree as well, but for air atomization purposes, polishing would be a great benefit, inlet and outlet.
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02-17-2012
Leaving it along porting wise I'd agree as well, but for air atomization purposes, polishing would be a great benefit, inlet and outlet.
02-17-2012
LIM was ported and smoothed/polished up, wasn't it?
02-17-2012
Secret race mods.
Just like the intake side of the heads, you want the LIM to be a little rough.
02-17-2012
The LIM hasn't been polished or ported in any way.
02-17-2012
Thought that was the one you got off me.
02-17-2012
It's the LIM that was In my original motor. I gave the other LIM to Ed to give back to you.
02-17-2012
Oh..odd, I thought I had given you the one with the temp sensor in it. Looked like the same position I had it in.
02-17-2012
You tapped the hole for the temp sensor into my LIM when it was off the motor.
02-17-2012
Lim should be polished. Injectors aren't in the lim, but the head.
02-17-2012
How much power is a polished inlet and LIM really worth?
02-17-2012
Too many factors.
02-17-2012
With that being the only variable.
02-17-2012
Your blower might not respond to polishing. In theory it should help.
But that's just theory.
02-18-2012
I would assume a ported LIM would make a big difference. I can't comprehend why gm would leave that much material in the runner to the gasket. The only thing I can think of is that they wanted to insure in the most underkill nature to have the air go into the heads with no interference from the edge of them. However it lookied like you could port the LIM a 1/4 of an inch all around the runners and still not worry about porting the heads to match.
02-18-2012
Keeping costs down.
Cast pieces are less expensive than polished or cnc by far.
There isn't that much room for opening up the lim.
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