~what the hell is this inside my LSX 90mm intake?
~what the hell is this inside my LSX 90mm intake? 
what was FAST thinking? now granid, its flowing OVER this ridge and not into it, but STILL why is it there? every single port has this 3/16" ridge...what purpose does it serve other than disturb the airflow and restrict?
i did....... but i just wonder why the F##K did they make the mold with that in there? i bet thats where the "whistle" some people get is from...
(in progress)
http://img104.imageshack.us/img104/8...moothed5pu.jpg
(in progress)
http://img104.imageshack.us/img104/8...moothed5pu.jpg
Everybody that I know, myself included, has had their FAST 90s ported to remove those ridges. It's really not that big of a deal, but it does make you wonder why in the hell the ridges are there in the first place. 
so, befopre installing it, i should port those ridges smooth.
Wat about port matching the intake to the heads? I have 6.0L heads and the fast 90mm intake...any suggestions on the witness depths?
Wat about port matching the intake to the heads? I have 6.0L heads and the fast 90mm intake...any suggestions on the witness depths?
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Originally Posted by CRL 01 SS
Everybody that I know, myself included, has had their FAST 90s ported to remove those ridges. It's really not that big of a deal, but it does make you wonder why in the hell the ridges are there in the first place.
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Originally Posted by obZidian
so, befopre installing it, i should port those ridges smooth.
Wat about port matching the intake to the heads? I have 6.0L heads and the fast 90mm intake...any suggestions on the witness depths?
Wat about port matching the intake to the heads? I have 6.0L heads and the fast 90mm intake...any suggestions on the witness depths?
TTT. Interested to hear more opinions on this subject.
Originally Posted by STANG KILLA SS 2
yeah it wasnt hard, but yeah thats my point, why did they make the mold that way on a $800 intake thats claiming to be the best on the market?
that is a guage for the maximum amount of allowable port matching, if a shop ports it for you, they dial set the machine to that depth and away you go. also it is in the instructions that came with your manifold, if they were looked at
Originally Posted by daryl2cb@yahoo.com
that is a guage for the maximum amount of allowable port matching, if a shop ports it for you, they dial set the machine to that depth and away you go. also it is in the instructions that came with your manifold, if they were looked at
Ummm, I think you're looking at those grooves, not the "ridge" (ski jump). There's no mention whatsoever about that ridge in the instructions.
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Joined: Oct 2005
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The little grooves top and bottom of each runner exit are porting guides. The "wedge" is just a PITA.
Here's some more on the subject:https://ls1tech.com/forums/advanced-engineering-tech/457394-manifold-test-afr-225-a.html
Here's some more on the subject:https://ls1tech.com/forums/advanced-engineering-tech/457394-manifold-test-afr-225-a.html
