I am porting my intake to fit a 58mm throttle body. Has anyone ever removed the entire center section between the front two inlet ports to make it a single opening?

sure... won't hurt... The real trick, IIRC, is removing the bump on the bottom... Or was that on the L98?

I do every one I port in that manner.

There is the IAC passage at the bottom.... don't cut it out.

There are pics of blackharleymans intake in my photobucket. I will link them later when I get off this tablet.
Will

Here is a pic of how I port them.

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If your going to grind on it do the whole thing right. Despite what some think there is alot ot be gained from the runners. Get a cheap set of snap gauges (or inside Mics)and a dial caliper....

You want to put about .125 of taper in the runner width. The runner should be bigger at the plenum tapering smaller at the flange. Since the runners are paired together on a SBC you want the center walls straight and the taper put into the outer walls...

Stay off the floor of the runners! I can not stress this enough.... It is Ok to poilish it up for cosmetics and I do that as most people are not head porters so they don't understand when they paid to have something "ported and polisshed" you leave an area untouched.... Do all your real grinding on the roof and sides of the runner. Keep and eye on how thin the roof of the runner gets just above the injector boss... I generally rais the roof about .150 and that leaves about .080- thickness at the thinnest point.

[URL=http://s50.photobucket.com/user/rklessdriver/media/Noland/DSC00787.jpg.html][/URL]

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Will

Thanks. Hopefully I can get this finished tomorrow.

Used to always remove it also didnt do the latest one just cant see any gain.

Only thing is its easier to get in there to clean things up.
Cleaned this one a million ways from Sunday and stull cant get that oil staining off it.

I run the roof down a little farther like will says watch out for busting through if youre working on that hump about half way.

Took mine out to a 1284 gasket. Have the new AFR gasket but it may pish the boundaries of sealing meaning it would but unles someone had AFRs it would be a waste.

Look whose back! Great to see you posting, Ron!!

I got lost lol

Lifes been super busy

Betw. #1 and 3 poss others there is a bolt boss right in the path of the entry that can be taken down too. Just use some sealer on the bolt.
Having an LT4 flowed tonight hopefully has to keep up with a 318 cfm head, just had an LT1 done see how the #s look.
SO much easier than TPI stuff thats for sure
GM castings sure are soft metal!

Could have sworn there were responses to this thread I can only see post #1 on threads now?

Anyway used to remove it I dont think theres any real gain but wont hurt if you want to. Just leave the EGR bump there.

They are good intakes you can get a LOT of air through them.