1988IROC350

I want to do some porting on all my tpi stuff (plenum, Runners, and base) I need help on porting the base though how do I go about doing that? Can it be done with a dremel? Should I port match the runners to it? Should I port match it to the heads? I need all the help you can give. Any web pages about this? Thanks

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88' IROC-Z
350 TPI
K&N Filters
MSD Ignition
160 Thermostat
B&M Shifter
Modified MAF
Delco Rapidfire Plugs
Accell 8.8 Wires
Accell Supercoil

Randy92Z

iTrader: (3)

Yep, you got it. Just get yourself a intake gasket and a runner gasket and port mach em up. Use your dremel and go about an inch and a half into the port.

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Convertible, L98, Edelbrock intake, runners & TES, SLP cam, Thin Head gaskets, March underdrive pulleys, Fastchips custom chip, Accel 300+ ignition, Relocated MAT sensor, TPIS airfoil & AFPR, K&N airfilters W/ chopped airboxs, Dynomax high flo cat, Flowmaster exhaust, MAC subframe connectors, B&M shift kit & XMSN cooler and NOS!!

Kevin91Z

iTrader: (1)

And be careful when porting, you dont want to go THRU the metal.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

ws6transam

I've fully ported a base. I raised the roof of each passage by .100". There's only about .200" of metal there, so it's really thin now! All up, it was a 16 hour job. This is with a 25,000 RPM die grinder using a six-inch long set of aluminum carbide cutters. I also used sandpaper rolls (60 grit) to finish sand the passage to a brushed aluminum finish.

super chevy

I have ported several intake bases, plenums, and runners. I use a die-grinder with a carbide bit to cut/enlarge the ports to whatever gasket I am matching to, usually a Fel-Pro 1204 or 1205 intake gasket and a set of TPIS large tube runner gaskets. By taking your time and using care, you will be able to not only enlarge the intake/runner ports, but you will be able to radius the ports to give the incoming air a straighter shot at the head, and remove some restrictions/casting flash in each port. I then use an 80 and 120 grit sanding roll to smooth the ports, and finish by hand sanding the ports with a 400 grit to get them as smooth as possible. By utilizing all these elements, the most recent intake I ported (an '86 casting) flowed an impressive 200cfm @ .400 lift (28") on the flow bench. That is only 2cfm less than a TPIS Big Mouth base!
It is my experience that if you port and gasket-match all three TPI induction components (plenum, runners, intake) you will see a signicant increase in horsepower/torque, and peak RPM.
Good luck with your porting!
Super Chevy