i know that the stock base is the most restictive component after the throttle body, so that definatly has to go.
but what about the plenum? if i end up getting a 383 w/ a big cam and aftermarket heads would it really make a difference if i just keep the stock plenum and heavily port it. this is keeping in mind that i will get siamese runners and a better base.

 

DEFINATELY port the plenum!! Knock out the EGR walls just behind the TB entrance, and port match the plenum to the new runners since the plenum holes hardly match up to the stock runners correctly, I can imagine how bad it is with some nice SLP runners. You won't regret it.

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Kevin Irving
85 Trans Am WS-6, 305 TPI, custom burned '86 PROM with '87 "165"ECM, Accel Supercoil & 8.8 Wires, MSD 6AL, Aluminum Driveshaft, Wonderbar, TB Coolant Bypass, Ported Plenum, Modified MAF, Syclone Fuel Pump, JET Airfoil

15.556 @ 86.65mph, Nov 10, 2000.... I know it sucks.. but it will get better!

http://www.geocities.com/transam85tpi/

Member - The Tidewater Trans Am Club, Norfolk VA http://www.geocities.com/ttacva/

 

89,

Here's a good starting point:

Plenum Porting.pdf

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Later,
Vader
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"I'm'a do Things My Way - It's My way or the Highway."
Adobe Acrobat Reader

 

Vader,

Everytime I see your stuff I swear that you were born to be a technical writer. Why isn't this circulated more often?

BTW, I just finished "detuning" someone's SLP system just this weekend!


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Daniel Burk
http://www.isthq.com/~dan/fcar.html
'84 Trans Am WS6/L69
KB SFC, Moser axles, Torsen Diff. PST suspension, Braided stainless brake lines, Koni struts, 11-inch rear disks,Spohn Adj. torque arm,
Ported 305 heads w/1.94"intake valves, Comp Cams XE262H, Griffen alum. radiator,
Turbine Technologies 2500 stall converter, underdrive pulleys, Crane Hi-6 & more.
1.05g skidpad verified.
New best E/T! 14.039 at 100.82 MPH in 41 degree air at Stanton, Michigan.

 

thanks Vader!
those instructions will help alot

 

Hey Vader.... the page referenced in that url is no longer available, is there anyway I can get this file another way? e-mail me please nblanchard@cogeco.ca



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1988 Pontiac Trans Am GTA L98 5.7L, Black on Black with 114,000kms.

Best ET 14.559 @ 95.25MPH
Custom 3" Stainless Exhaust Y-Pipe back (High flow Cat and Flowmaster Mufler)