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Ben · 10-18-2006, 01:38 PM

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 · 08-23-2007, 04:50 PM

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

2000Si · 08-23-2007, 06:16 PM

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 · 08-23-2007, 06:23 PM

GSR has smaller combustion chambers than the b16/itr head

2000Si · 08-23-2007, 07:38 PM

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 · 08-26-2007, 11:36 PM

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.

10-18-2006, 01:38 PM	#1
Ben Junior Member Join Date: Aug 2006 Posts: 26 iTrader: 0 / 0% Rep Power: 7	B16 Head w/ B20 Block VS. B18 Head w/ B20 Block 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.

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08-23-2007, 04:50 PM	#2
Draven488 Junior Member Join Date: Sep 2006 Age: 25 Posts: 1 iTrader: 0 / 0% Rep Power: 0	Im working on A B18 head gsr with a b20 block, any one have any edvice or tips onthe swap or any Spec.

08-26-2007, 11:36 PM	#6
dtob Senior Member Join Date: Mar 2007 Posts: 578 iTrader: 0 / 0% Rep Power: 11	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.

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