1. What is the stock cfm flow number for an 89 305, tpi head(swirl type)?

2. Would you recommend using a 1.6 valve on the exhaust side?

I will be doing a cam swap soon.

Thanks guys.

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89Iroc, 305 TPI, WC T5, 3.08 Posi, Flowtech Headers 1 1/2, Hooker Y-Pipe 2 1/2, 3 inch over the axle, Flowmaster 80, No Cat, Aluminium Driveshaft, Ported Plenum, Air Foil, MAF Screens/Fins removed, K&N, Gutted Air Boxes, AFPR @45 psi, Ram Air, Throttle Body By-pass, Bumped Timing @12, Bosch +4, MSD 8mm wires, HP Rotor, Cap and Fuel Filter, Sensi Trac rear Shocks.

 

I don't know-- I do know that it's tight. I did a 1.5/1.94 combination. Here's what the chamber looks like when you add a 1.94 intake valve to the centerbolt 305 head:



I had to correct the shrouding around the intake valve by opening up the combustion chamber. You might have similar problems if you add a 1.6 exhaust. You'll also need to extensively port the exhaust to take advantage of the bigger valve.


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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.