Originally Posted by thedak
You hogged out the lower way too much.
Nice way to waste $800.
You can buy a new lower shell and start over without buying an entire new intake.
Originally Posted by 03EBZ06
that looks like a vacuum leak and tuning nightmare. I was thinking about upgrading. Your post has officially ended that plan. What does FAST say about it?
Why, because a non professional over ported an intake and screwed it up? That's not FASTs fault, he should have left it alone or sent it to a professional like Tony, not hack it up with a dremel. (I did the same thing to a set of AFR 195 when I was a teenager, started to port out the CNC lines and the bit caught and cut a hole through the wall of the intake port
Originally Posted by Tony Mamo @ AFR
I agree.....you removed to much material from the base.
Its OK for the manifold to be slightly smaller than the intake port opening.....that's a preferred situation versus the opposite effect.
Good luck and be a little more conservative on the other holes assuming its not too late.
I agree too aggressive on the porting, and if you look at an unported FAST it does exactly what Tony is talking about with the overhang. FAST told me at PRI that they design the manifold so that the runner is slightly in, because that's OK, but the opposite is never good. And that if you really wanted to sand roll them even you can.
More conservative is always good advice, I didnt touch my LS3 102mm LSXR, not even with a sand roll! No issues! Edit:
I remember reading about this in the instructions;