B16 Head w/ B20 Block VS. B18 Head w/ B20 Block

[Ben]

Which one performs best, most power, most reliability, etc.? I have heard a lot about them recently, and I have done much seaching and have come up sorta short. Has anyone done these swaps (I know have done b16 w/ b20 block). what about with a b18 head? Power wise and bolt-on upgrades wise would I be better getting a k20? I think that would be more $$$! Thanks very much.

 

[Draven488]

Im working on A B18 head gsr with a b20 block, any one have any edvice or tips onthe swap or any Spec.

 

[jamesA]

From what I've seen a GSR head vs a b16a head (example: a2 and a3) will flow roughly the same from the factory. It's all in the build really, cams, do you plan on a port and polish? 3 angle valve job?

IMO go for either one, shop around to find the best deal on either or.

 

[eg6sir]

GSR has smaller combustion chambers than the b16/itr head

 

[jamesA]

Isn't it like a .2-.4 CR difference between the two on the same block? My opinion still says shop around for the cheaper one and build it.

 

[dtob]

Ya shop around and get the best deal. The b16 head will have more top end power because of the port shapes which are a little more straight on the B16 but the GSR has smaller combustion chambers which is nice for a little more compression. My pick would be (which is what I am doing) GSR head with S2 vavle train and good PNP.