906 Head shop

Oh how I agree with the comment above!

This is by no means the best overall 906 head we have ever produce, but it is the only one that I have with a record on the same flowbench, same head, same port, with a progression from stock valve through larger valves, stock untouched port through ported. These are all flows are at .500" lift. The first two are benchmarks so that we have something to compare the other flows to.

275 cfm..........Box stock Edelbrock Performer RPM 440 2.14 intake
224 cfm..........Stock unported 906 with the stock 2.08 valve
280 cfm..........Ported 906 with the 2.08 factory intake valve, same port as above, the #1 or #8, 280/224=25% increase from stock.
299 cfm..........Ported 906 with 2.14 intake valve, same port as above, 299/224=33% increase from stock.
302 cfm..........Ported 906 with 2.20 intake valve, same port as above, 302/224=35% increase from stock.

This is the most recent set of 906 heads (2.25 intake) we flowed: 91 cfm @ .100, 165 cfm @ .200", 219 cfm @ .300", 277 cfm @ .400", 299 cfm @ .500", 325 cfm @ .600", 335 cfm @ .700" and 339 cfm @ .800".

On 7/23/2011, those heads made 694 HP @ 6,900 rpm from a 451ci B-engine with 9.7:1 compression and a single 1050 cfm 4150 4bbl, 91 octane, all motor....no bottle, no boost.