bigsnorlax

Now i have an h23 intake manifold, plenum, runners, the whole deal and i was planning on port matchin my head to match the intake. Now iv heard it is dangerous to open up the f22a ports that big and i lose enough material to seal with the gasket. My question is what is the differnce between the f22a6 dual runner intake and hte h23? Besides ports, does anyone know how runner length, throttle body diameter, and plenum volume compare? I might just get a f22a6 intake if its not to much different.. but i would think the gains would be less....

bigsnorlax

meh... anyone?

Nocture

Almost the same from the runner down. They say A6 runners are shorter (good for torque) by how much.... don't know.
H23 has a bigger plenum
H23 has a bigger TB

I suggest staying with the H23 IM. You can get bigger aftermarket TBs if you like.

Now a question for you. You swapped the A6 head onto the B2 block?

bigsnorlax

Hmmm alright thank you. i might just take the time and get the H23 on there. Ha and no i havent yet. Im currently doin some DIY port and polishing, and since ill probly go h23 now i gotta port match. Im waiting on new bisimoto pro valve springs for my new cam so i can get all the parts and then just get it all done in a weekend or so. Are you thinking about doin the swap though?

Nocture

Yeah, I would like to attempt to do this head swap. But I'm stuck on which head gasket to use and which distributor to use. I have a 272 cam, H23 TB and Plenum bored and port matched, and the A6 head. I also have the water pipe and thermostat housing.

bigsnorlax

Niceee, yeah im still prepping and gettin my performance mods/ parts ready to go for install day (whenever that is ) I havent really looked much into how the insall goes yet haha which is probly bad, but im doing the costly fun things first that will make it go zoom zoom. So with your plenum and TB form the h23 i take it you have the A6 dual runner intake your puttin this on? AS far as the head swap goes like i said i havent done too much research yet, i was under the impression is almost a straight bolt on with the distributor cap and even wires/plugs being interchangable. But who knows, Ill Pm u if i find any info, we can help eachother out a bit if u like as we are doing very similar mods

Nocture

Yeah I have the A6 runner with the H23 upper plenum.

Another thing I forgot, the iab's. I don't know how well it would work through vacuum, if the ecu is not connected to them. I have the PT6 ecu as well, but I think I have to switch two or three wires around.

Maybe you're right about the distributors. I'm pretty sure the distributor can bolt up, but what about the connectors. Being that a 4th gen head is going onto a 5th gen block.

bigsnorlax

as far as the IAB's i plan on just removing their butterfly valves and filling in the holes, then boring out the runners' openings at the plenum so its just all the way open all of the time, not sure if ill lose some on the low end.. but i dont see too much harm in this...

Nocture

I do mind! lol I city drive most of the time, so low end is a need for me.

bigsnorlax

haha yeah same for me, but i really dont know if you would really lose much... cus below ~4500 Rpms only 2 of the larger runners are open, above on all four open up. I wouldnt be surprised if honda does this for emissions and gas mileage, But im just removing them... hah

Nocture

I don't know what you mean, but below that rpm the four (square) runners are open, after that then the butterflies open for the other four.

bigsnorlax

Are you sure? I know the smaller square runners are always open. But i dont 4th gen accord so i dont know for sure, but from what i have read 2 of the larger runners are open during low rpms (6 total runners), but all of the larger runners open at higher ones ( 8 total runners open), thats just what i have heard. Either way im just keeping them open, im sure the throttle response from haveing them all open would be a huggggeee plus

Nocture

1000% sure!

The four main runner have nothing covering them. The other four runner have the butterflies contolled by one main shaft. 4 open all the time, 4 open by butterflies.

I van pictures tonight if you like, when get home

bigsnorlax

yeaah i know how it works ha. uhh yeah let see those head comparisons!!

Nocture

ok some nice comparison pics of the A6 head and B2 head.

A6 Head


B2 Head


A6 head (left)and B2 head (right) showing the B2 is wider


Now to the problem.
A6 head gasket on the B2 head

See it?

A6 head gasket on B2 head problem area


Now if I'm thinking correctly. That hole is coolant. which means, how the hell we cover that up on the block side? Even if you get the B2 head gasket, that hole will be there. Everything else is lined up perfect, its just that one damn spot!

Hmmmm...........

Nocture

Pictures were taken with the exhaust side up

bigsnorlax

interesting, you think that could be the hole that guy was talkign aout? He claims its a hole from casting or some deal.... maybe try pourin water in it and see if it can exit anywhere... ha idk

Nocture

Ok but for what? That's the B2 head. It looks like it can be plugged in the block itself. Unless when placing the A6 on the B2 block, it blocks that passage. But if it's blocked what kind of cooling issues might arise. Now, how to plug that hole. I have to measure when I get home. Maybe someone can come in and give ideas.

bigsnorlax

Well by pouring water or someting into that hole on the b2 head we could see if it leaves the head via another hole or port. If it looks like it goes right in that hole and out of another one then i would think its safe to assume its for coolant and then we'd have a problem ha. If it is just a hole from casting like the FAQ said, thaid i dont see why we couldnt just use the b2 gasket and not worry about it being sealed off on the block

bigsnorlax

ehhh?

Nocture

eh? nothing... I haven't touched the heads since those pictures.

bigsnorlax

oh ha well alrighty then

Nocture

I posted in cb7tuner, hopefully they can give some insight on this.

bigsnorlax

worddd