ok i'm going to port my heads but i would like to port my tpi setup while i have it off. what do i need to port? pics would be helpfull. what do i need to watch out for? like hitting any coolant or sensor stuff.
thanks for the help
Andrew
p.s.
could this get me into the 13's with me possibly adding 3.73 gears (i have 3.08's now)

------------------
Andrew Peery
1987 IROC, 305 TPI, T5
Hooker Competetion Ceramic Coated Headers, Flowmaster, Ported Plenum, Accell plugs, Wires, Cap, and Rotor
All smog equipment gone and no cat
before headers
192hp and 265tq (at rear wheels SAE corrected)
15.20 @ 92.5 mph with a 2.4 60ft
after headers
14.48 @ 95 with a 2.19 60 ft time

 

anyone?

 

If you're running 14.48 now, porting the intake and heads wont give you 5 tenths, more like 1 or 2 tenths.

Check out http://www.sa-motorsports.com/ for pics of head porting. The same things apply to TPI porting. There really isnt anything in the way of porting the intake, so just be careful and dont port too far. Dont make the intake larger than the head opening, as that will create a ledge and kill airflow into the heads.


------------------
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

http://www.tribal-treasures.com/cars...-port/port.htm

 

thanks guys,
well today my clutch went bad and i think it probably costed me a couple tenths as well because its the stock clutch with 114k miles on it. hopefully i'll get it all done in a week or so. then i think with all the porting and a new clutch and maybe some gears i can hit a 13

 

You probably already know this, but do only one change at a time if you can help it. That way you know what the change did.

My 2¢

 

I was wondering what size headers you have --5/8 or 3/4? I'm going to get headers for my 305 and I was not sure if the 3/4 headers would be too much. I've posted before and people recommended the 5/8s. Thanks.

 

I don't know about 305 heads, but I got 30%+ flow imporvement on my AL Vette heads through porting. A generic head porting may only get you 5 -10% more power, but have a pro do it and it'll be like driving a different car. It's all about the shape of the ports and runners, not the size.

 

I ported my own 305 heads, and I've ported about ten TPI plenums, various runners, and an intake. There's pictures and suggestions on my website for both:

http://www.isthq.com/~dan/fcar.html



------------------
Daniel Burk
http://www.isthq.com/~dan/fcar.html
'84 Trans Am WS6/L69
KB SFC, Moser axles, Torsen Diff., 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.
Best of 14.039 at 100.82 MPH in Stanton, MI
New! 275-40-ZR17 tires on ROH ZS 17 x 9.5's

 

i have 1 and 5/8th primarys
Andrew

------------------
Andrew Peery
1987 IROC, 305 TPI, T5
Hooker Competetion Ceramic Coated Headers, Flowmaster, Ported Plenum, Accell plugs, Wires, Cap, and Rotor
All smog equipment gone and no cat
before headers
192hp and 265tq (at rear wheels SAE corrected)
15.20 @ 92.5 mph with a 2.4 60ft
after headers
14.48 @ 95 with a 2.19 60 ft time