Hey i was wondering if i was to port polish a head for high compression, which head would be better for NA applications? any thing helpful would be very much appreciated thanx

 

Depend on type of engine you have. The b18c1 has the smallest combustion chamber volume out of the B Series heads in stock form. So it's your best bet.
Port and polish will not increase compression ratio. you must mill the head

For example. if you have a b16 engine, its anywhere from 10.2:1 or 10.4:1 compression ratio. simply putting on the B18c1 head will increase ratio to 10.44:1 or 10.65:1

b16 obd0 10.2:1
b16 obd1 10.4:1

 

oh my bad, i meant i'm going NA and i have USDM ITR pistons in a b18c1 block and my friend said that if i wanted to trade my gsr head for a SI head, he'll trade me. I was just wondering which one would make the most overall power after i port and polished it. and is it a good trade

 

I like quench.

 

stick with the gsr head. .. .

http://www.importreview.com/re....html



blue lines are gsr, red lines are b16. . .

B16A has:
port flow port/polish (mild)
Civic Type-R intake cam
ITR exhaust cam
Comp valve springs/retainers
Type-R intake manifold

GS-R head has:
Stock head
Stock valvetrain
Stock intake manifold
ITR cams, intake and exhaust.

 

Whoa, Thanks for the help, any one else?

 

Well I would say stick with the B18C head unless you can get yourself a B16 TypeR head or just the 16 TypeR cams and put that in your current head.

If will result in a better head flow.
And no, I'm not making this up.

 

I believe that in the ls vtec, the ls's crankshaft's stroke is much higher than the gsr's. But i am using the GSR block w/ the gsr crankshaft. so this is why i'm still wondering whether or not the b16 is stronger than the b18. Do they have a diagram on a gsr block? between the b16a and the b18c? the b16 block could have a longer stroke like the ls, so i was wondering on the maybe just the on the b18c

 

BuMp!