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You can go right ahead and use the B20F head if you wish. Originally it had a little lower compression ratio than the B20B so it would pay to measure the height of the head--engine mating surface to top of valve cover surface--that will give you an idea of its present state--post results (measure it in mm) here and I'll bet someone can give you the answer. You'll get better performance and gas mileage the higher the ratio--no need to stay with the very low 8.7 (I think) to 1 of the B20F. Also check to see if the head is late enough to have original hardened exhaust seats (or if they have been added--a worthwhile mod). -- Dave
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