I did allot of research and can't seem to find an answer. I picked up fast 90 for $300 and figured its cheap might as well port it..... Anyway ported it out to 29mm, stock it 24ish and allot of the guy's I am seeing only went to 27mm. Was wondering if I went too much and if this will hurt performance vs stock ls1 intake? I plan on port matching my 243 heads when I put the intake on

 

ported fast 90 is not too much for a 346 with #243s and cam

 

A ported FAST 102 is NOT too much for a 346, so I think you're good with the 90, LOL..... Also, kudos to you on finding a 300 dollar FAST 90

 

ok thanks for imput was scared I went too far on it, looking at tony's port jobs and I went almost double what he does. Ill put pics up sometime soon... And it was great buy, was running with a few people and setting up races and someone shouted anyone want this intake $300, thought they were joking.

 

Wow wish I could find one for $300. Good buy!!

 

you ******* stole that intake!!!! im jealous as all hell

 

don't port the the intake runner too much ,unless you match it up to the head intake port.

 

What in the world did you open the ports up for? Youve possibly just ruined it, intake manifolds have a specific shape, size and taper. Youve just taken an area where it tapers down to keep velocity and opened it up. So just before the air get to the head it goes into this wide open area and loses it velocity. Not to mention, if its bigger than your heads intake port, its now going to hit a wall and tumble like crazy.

Unless you reallly know what your doing, like tony does......Do you know what size your heads are?

 

Wow $300 that's a steal. Where was this a month ago when I bought mine haha

 

I'm jelly.

 

I know right now it's bigger than my heads, going to port match them when I install the intake so it will be smooth transition... running 241 heads but planning for 243's and a ms3 cam next spring.

 

how big did you port your 243's im looking to get a pair to run with a ms3 cam as well. i think im going to get them cnc ported by a buddy. just wasn't sure if you had specs?

 

There is always power gains to be had when the porting is done correctly. matching the ports is the best way eliminate the turbulence involved when they are not matched. only go as far a 2 inches into the ports and keep it uniform. The closer you are to the scribe marks change to a less abrasive tool. Make a little steel measure device so you can use it to check uniformity and deppth as you go along. If you take your time and don't get in a hurry you can do it. It will be good experience. Remove as little material as it takes to match them but use the gauge periodically to check you are still on track..

 

its better to have the intake port smaller and inside the head port then bigger then or missed matched to the head runner port.

 

In for results and pics!!!