well the 3mm rod lenth make a diffrence on power and torque? d15b block rod lenth 134mm d16z6 block 137mm but im not putting the block in but would that make a diffrence in power or torque with the head on the d15b? well the bore and stork make a diffrence in power and torque? d15b 75mm x 84.5mm (3.0 in x 3.3 in) d16 75mm x 90mm (3.0 in x 3.5 in) like i said tho im just putting the head on the d15 and want to know ? or wut would u recmend cars a 89 honda civic hb?????