Originally Posted by
Toreyjw1
im confused as to the reference to the b20z head. if you're saying you're planning on slapping it on top of your b18b, then im willing to bet your compression is going to drop. its counterintuitive to place a head with larger head displacement such as a 2 liter head on a 1.8 liter block despite its better flow. you'll end up breaking even on power, and your power will just roll in a little higher and carry for a longer amount of time hence better drivability. and ITR pistons wont work unless you alter the rods. now civic si pistons would work and that will give you much higher compression if you still ran the stock LS head in terms of compression due to head capacity differences. with the b20z head and say a higher compression piston setup, your power differences wont be significant. in combination with say 403's or 404's, you may make a decent amount of power with the proper tuning. ive ran both 403's and 404's in a b18b and a higher compression jdm b20b and my personal preference is the 404's. peoples acclaimed preference on the 404's in terms of drivability are skewed considering most people who seem to have an input haven't ran them or driven a car dd with them.
ive driven down the road of attempting to build a b18b and ive done MUCH research in terms of its capability and now, in the end, im wishing id just gone turbo considering the minimal power gains in comparison to the money ive put in it. and for the record, ive seen multiple b18b setups with essentially all the same head work (cams, springs, retainers, guides, valves, multi angled valve jobs, and polishing) with bolt ons galore and they can all range as much as 25whp all based on tuning. it comes down to depicting the correct a/f thats safe in terms internal combustion heat (too lean) and the revs or where the power comes in. again, it all depends on what your plans are for the car. slap some tall cams in it and arp rod bolts (properly installed and torqued) and make power to 8 grand all day safely. it wont be super fast but will track well in terms of its power and where you can expect to get it.
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