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PreludePower is the best prelude forum there is.
They are OS, i used to be there like 4 years ago when i had my 3rd gen.
They are correct, no B series engine will easily drop in, and it is easier and more cost efficient to put an h22 in there, and wider support.
You CAN use a b20a or b20a5 or b20a7 block with the b16 head, like Cal said.
It does require a bit of work.
Find the site archiver, or googled cache site of LudeSpeed.com (Tom) and see pics of it done.
He made some INCREDIBLE numbers with a blown headgasket (low spot on block)
I think it was like 130TQ @ 3,xxx rpm not even to the power band yet.
The b20a(5)(7) motor likes to break though,again as Cal mentioned...
I read on PP a long time ago that the t-belt spacing was offset by so many tenths of an inch or something, and that's why alot of 3rd gen preludes snap t-belts like nothin.
I'm sure the motor CAN be built to be 'quality' but it's not a 'good' idea.
I still want to build a b20aV just to do it... and maybe someday i will.
Tom from LudeSpeed was selling a bolt on b16 head kit for around $2,000, came with EVERYTHING YOU NEEDED including the oil pan parts and such... he no longer sells the kits though.
The main problem you will run into is you need to drill the head in _i think_ two places for oil passages, and you need to have the head bolt holes widened up for the bolt pattern to match up correctly.
Then you have to make your own headgasket, since none will work, you HAVE to make it.
Putting a b16 into a 3rd gen prelude would be like swapping a ZC motor into an accord, it's possible, but the lack of torque will just make you want to shit your pants.
Accordingly, putting a b20/z in there would be a waste of money/time/effort also.
It's specs are close to the b20a, but the b20a is alot cheaper to work with.
That is why there is alot more h22+3rd gen support, it's the only swap that makes sense.
It's not that much work really from what i see/read/hear, but i haven't personally done a h22 into a 3rd gen, nor could i afford to.
I think total cost rounds to $4k for the h22 in there.
I would love to see someone with a bunch of hookups to do a b20aV and dyno it.
I also read on PP that b16 pistons/parts fit in the b20a(5/7) without modification, and something something, smaller stroke somethin somethin higher revving somethin somethin getting safer and easier etc.
There's a TON of good info there, and a lot of people who will help you out.
But don't make a request for the b20aVTEC, they just tell you to "ask xxx" or "search for xxx"
I searched and found 100,000 n00bs saying "b16 head fit on here?" just gettin flamed away.
A cheaper alternative is the h23 into there, and still makes decent power for the price ($600-$900) similarly priced b20b/z which will end up costing you more in the end most likely, for less stock form power.