I was just wondering cuz i was talking to my friend and he said that some guys are running b16 heads on there b18c's cuz the head flows better then the stock head. From what i have been reading i thought the gsr head flows better then most honda heads. Anyways if you guys have any experience wiht this or have any facts to lay down that would be awsome thx. LATE!!

 

yea i have heard of people doing this, im pretty sure its just a direct bolt on. the main reason people swap the heads is due to better flow then the b18c1. the best head to swap would be the b18c5, but it also costs more money.

 

i do not believe it has been proven, but there's been a lot of debate on which one is better.

 

there have been many debates about this. And both have their advantages...so its really up to the owner.

 

Thx for the info guys but do you know where i can find some info on the heads, and where i could get the b16 or c5 head?

Cuz i should be getting my swap done in my 91 civic hb si soon and i would like to know which would be better.

THx!!!

 

I believe the B18C1 head is slightly better, and here is why.
The combustion chamber "CB" gives the engine higher compression.
The B16/B18C5 heads share the exact same casting. The difference is the Type R's lighter intake valves since the type R's have reduded radious at certain areas, while the B16's keep the same diameter all the way. Also the type R uses dual springs on both the intake and exhaust.
Type R intake valve on the left and B16 intake valve on the right.
The B16 has a smaller taper while the B18C5 has a larger taper radious, better flowing. also notice the material removed on the valve shaft just above the dish on the type R.


Now getting back to the heads, the B18C5 CB is round, not as good at preventing detonation since it has large quench areas that the piston does not fill at TDC.
the B18C1 CB is not round. It has extra material at the intake and exhaust sides of the CB. It is better at preventing detonation since the quench areas are much smaller and they are almost eliminated when the piston is at TDC.
Also the higher compression you get with a B18C1 head means a bit more HP.
I have seen the port and polish Honda claims on the B18C5 head, not worth it if you ask me. It's amazing how much promo they get out of such a sissy PP job.

I would also use a Skunk2 intake manifold rather than the sual intake runner in the C1.

 

if any1 cares i have researched the gsr head is the best head to use if your looking to bump up c.r. it flows the best , the b16 and type r heads r the same the only difference is the more aggressive cams and a higher reving valve train and of course the intake manifold

 

A stock GSR head only out flows at high and low lift and its not by very much. The GSR head does not whip the B16a. The GSR gets outflowed at certain valve lifts. The B16 and ITR ports are the same except the ITRs are hand ported from the factory.




[Modified by Phat_Optimo, 10:35 PM 3/11/2003]

 

The gsr head should flow a tad bit better, but not that noticable difference. The biggest different between the heads is the cumbustion chamber shape, a GSR head is squared shaped (if I remember correctly) and will yield higher compression compaired to the b16 rounded cumbustion chamber which will yield lower compression on a GSR block. The ITR head is the same as a B16 except the runners are slightly ported but not fully. I am not taking in to account each head has different parts ie valves, springs, cams ect......
I believe the b16 head is put on a GSR block due to the cost and the fact that a ITR manifold can be bolted on.