170 psi = compression?

Thanks and I not so patiently waiting for my quote to come in on a 408 stroker with his recommendations.I do know he is recommending aluminum heads.He can get a kit right now for 1600 cdn and we will see what the rest is lol. The hardest part I am dealing with is the 1500 for just the machine work, although 20 years ago I paid 800 so I guess not too bad