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09-25-2008, 10:09 AM
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#1
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Join Date: Jul 2005
Location: Williamstown NJ
Posts: 479
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LT1 Intake Manifold porting...
Hey everyone,
I just recieved a ported intake manifold that I bought on E-Bay. The listing said that it was a fully ported manifold that was matched to a 58mm throttle body. Measurning the manifold, the TB openings are anywhere from 48mm-55mm & the holes arent even round. Looks like he opened them up with a hand tool. I have never used or purchased a ported manifold before. I am thinking that the piece I got is a hack job, but I want to make sure that this isnt normal before I start complaining.
Thanks,
Mark B
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F-Bodyless 
01 GMC Sierra C3 6.0L, AWD, Westers Tune, K&N, Hella LED Tails
03 Pontiac Grand Prix GT, GMPP Handling Kit, LS1 F-Body Brakes
Last edited by Mark B; 09-25-2008 at 10:10 AM.
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09-25-2008, 11:03 AM
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#2
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,938
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Thats not good, did the "porter" touch any of the runners?
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Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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09-25-2008, 11:30 AM
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#3
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Join Date: Jul 2005
Location: Williamstown NJ
Posts: 479
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Yes. All of the runners were worked. Although, to my untrained eye, they look pretty good.
__________________
F-Bodyless
01 GMC Sierra C3 6.0L, AWD, Westers Tune, K&N, Hella LED Tails
03 Pontiac Grand Prix GT, GMPP Handling Kit, LS1 F-Body Brakes
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09-25-2008, 11:43 AM
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#4
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,938
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Well thats good, but you should def clean up those two main circles. If you have a dremel get a nice aluminum router type bit and clean up to the full 58mm.
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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09-25-2008, 02:27 PM
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#5
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Sliderule / Moderator
Join Date: Oct 2004
Location: Catawissa PA
Posts: 2,294
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What other mods do you have. The stock intake flows well for the RPMs the LT1 run at ( below 7,000. Portnig the plenum/runners will have very little gains.
Can you post pics?
The front should be opened to match the throttle plates. Internally the runners should be opened up to match the heads. I have stage III porting on my intake and heads, they match Felpro race ports (mine match the Felpro 1207 I think ). Stock the plenum and runners have a semi ruff finish, when ported they would be smoothed.
The key to better flow in the LT1 intake isn't really the runner cc, the plenum isn't that big that it will support excess runner size. What you want is to rework the leading and inward edges of the runners to promote better air flow into the runners. Also the area under the injectors should be opened up to ensure the gas is being sprayed onto the valve and not onto the intake which could cause fuel drops to form (or puddling).
but with all the above said, The only thing you really need to worry about is that the a 58MM throttle body gasket matches the porting is correct, if the holes aren't right you could be close to the gasket edge which could cause vacuum leaks. There isn't allot of gasket surface.
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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09-25-2008, 03:42 PM
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#6
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,938
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Quote:
Originally Posted by Pampered-Z
What other mods do you have. The stock intake flows well for the RPMs the LT1 run at ( below 7,000. Portnig the plenum/runners will have very little gains.
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Well at least he didn't go out and buy the edelbrock intake....
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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09-26-2008, 08:47 AM
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#7
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Sliderule / Moderator
Join Date: Oct 2004
Location: Catawissa PA
Posts: 2,294
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Quote:
Originally Posted by Shownomercy
Well at least he didn't go out and buy the edelbrock intake....
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LOL!
__________________
93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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09-26-2008, 11:26 AM
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#8
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Join Date: Jul 2005
Location: Williamstown NJ
Posts: 479
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So what should I do? Return it?
__________________
F-Bodyless
01 GMC Sierra C3 6.0L, AWD, Westers Tune, K&N, Hella LED Tails
03 Pontiac Grand Prix GT, GMPP Handling Kit, LS1 F-Body Brakes
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09-26-2008, 11:29 AM
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#9
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,938
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Clean up the intake holes, and slap it on your car. It can't hurt.
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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