LT1 intake porting
LT1 intake porting any one has guidelines for porting the LT1 intake manifold? specialy for the roof side of the LT1 intake manifold becuase i was told that the stock LT1 intake manifold has a restriction in the roof area.
thanks.
thanks.
Yea, it is where the fuel line crosses, you cannot so a whole lot, i port my own, i stay on the runners, kina a gasket match to open it up, then i take it in as far as possible, then i will hit it with my stones, from there i use my polishing bits, it is a bit hard with the hardware i use to get the injector dips how i want them till the paper flaps i use ware down a bit, but they fo kina quick at 20,000 rpm, i use allot of them.
Then i was readign on how Lloyd said not to gasket match anything. Iv been following threads about porting the intake and theres a lot of agruments about it so i just didnt do mine. Maby someone can chime in on this cause im wondering myself.
Well, LE heads are opened up from the ones i seen, they might not "port match" but they sure do open them up, sorry i didnt take any pics man, i was just trying to get the bitch back together.
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yeah you dont want to " gasket match" unless you know EXACTLY how to do it correctly. a slight difference in size is ok IF the intake is smaller port then the head, but NOT the other way around. if you open up the intake and the air comes out the intake and smackes the edge of the head cause its not lined up properly, you got a huge loss there. and noone can properly port match if the heads arent torqued down on the block. differences in block height, or milled heads, or thickness of the head gasket will alter the exact placement of the heads/ports. you can use the int. gasket as a template if you open up your heads port to match the gasket. then use the gasket to indicate where the head ports SHOULD be. but only so as you know NOT to go all the way to the line where the head port is. I tried looking for info on th eexact method and couldnt find it along time ago. so I just cleaned up my intke ports, opened up the throttle body holes, smoothed the entrance points behind the tbody holes, and called it a day.
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Id love to see some pics of that thing opened up. so how the hell did you close the intake back up? more pics please. if you got a good way to make a new top (Looks good anways?) and its very functional, then hell yeah, looks like a great idea.
curious, how bad did it look when you "exposed" the runners match (or mismatch?) and what heads do you have?
and where did you get the cold air kit?
curious, how bad did it look when you "exposed" the runners match (or mismatch?) and what heads do you have?
and where did you get the cold air kit?
Joined: Nov 2001
Posts: 10,023
Likes: 6
From: LT1 land...the "409" of the 90s!
Actually there is nothing easy about modifing one of these intakes. Cubic dollars meets strong will.
The runners were not that bad. I had ported it before. Just needed a little up and down machining
The intake? One of ours Cheap effective and easy
The runners were not that bad. I had ported it before. Just needed a little up and down machining
The intake? One of ours
Cheap effective and easy 
On The Tree
Joined: May 2005
Posts: 153
Likes: 1
You add metal on the outside of the intake just above the injector bosses. That way you can safely remove more material from the roof of the ports.
I have an LE ported/welded intake and that is what was done. I believe its called "raising the roof"
I have an LE ported/welded intake and that is what was done. I believe its called "raising the roof"
Joined: Nov 2001
Posts: 10,023
Likes: 6
From: LT1 land...the "409" of the 90s!
Originally Posted by fireman
You add metal on the outside of the intake just above the injector bosses. That way you can safely remove more material from the roof of the ports.
I have an LE ported/welded intake and that is what was done. I believe its called "raising the roof"
I have an LE ported/welded intake and that is what was done. I believe its called "raising the roof"
Hey i know where that phrase came from!
Originally Posted by ks my ss
i am doing the same thing. i cut the entire top off and im redoing it all.
chris
Joined: Nov 2001
Posts: 10,023
Likes: 6
From: LT1 land...the "409" of the 90s!
Originally Posted by Irocss85
so then take some good pics for us, and let us know how you sealed the top again, since 2fast4love doesnt want to share.
chris
chris
Nothing to share? you cut the top off LOL!
Originally Posted by TwoFast4Lv
Nothing to share? you cut the top off LOL!
I understand, cutting the top off would be easy. what did you do to reseal it back up? I can kinda see your alum plate thats been bent to match the top surface, but make it alittle easier for us to see how YOU did it then more people would be wiling to do something like that. I can def. see the benefits of getting it PERFECT.
Joined: Nov 2001
Posts: 10,023
Likes: 6
From: LT1 land...the "409" of the 90s!
Originally Posted by Irocss85
I understand, cutting the top off would be easy. what did you do to reseal it back up? I can kinda see your alum plate thats been bent to match the top surface, but make it alittle easier for us to see how YOU did it then more people would be wiling to do something like that. I can def. see the benefits of getting it PERFECT.
Then look inside
My intake was highly modified and I am about $600 in welding alone. My Guy is good and I can not weld aluminium. there is anouther $500-600 in porting and flow work on and off a flow bench. Plenum volume is about 2/3s more then stock.
the top plate was made that way for porting and flowing purposes only. It is Bolts and siliconed back on.
The attatched pics are from the LT4 intake we did