What do they flow? Mine flowed 387 after Indy's CNC and Jeff@Modern did a bowl blend. With 10.4-1 compression, a Bullet solid roller .767/.676, 288/292@.050, tunnel ram and 2 850 thermoquads and about 50 dyno pulls tuning it, it made 853hp&818ftlbs. On my dyno. I have not finished updating the motor yet. A new set of the Indy Hi-Po heads, (they flow 442 corrected) and a couple other goodies. I'm guessing 925-950 If everything works correctly. Dave