hey i just want some opinions on what people think.. I know the gsr would be better due to air flow, ect.. but is it worth the extra money? and if I run the gsr head, will i need the IM because I know it uses the secondary butterflies in the IM, and then would that mean a new ecu.. or chip or whutnot? so the 2 questions I need answered..

1) Is it worth the cost difference?

2) Do you have to run the GSR IM, or can I just use the b17 IM I already have?

 

The B16 head is actually better, and it is the same or similiar to the head that came on the B17, do you not have that head anymore? The Type R head is merely a refined B16 head along with a better valvetrain. Also, going with a B16 head simplifies the whole butterfly thing.

 

The B17 head is a PR3 head. Same ****. The B17 intake mani is the same bolt pattern as a B16 IM. Same ****. P72 is where all the differences come into play.

 

ya I still have the b17 head.. this is actually for a friend.. he bent a valve and i told him to just replace the valve(s) cuz it would be cheaper, but another mechanic told him he would be better to replace the whole head just in case. As long as he's fronting the bill, I don't care haha.. i'll prolly get his spare head if he gets the new one

 

Here's something to consider: the B17A is down on compression compared to other B-series motors and could use more for optimum performance. The GSR head would raise your compression from the stock 9.7:1 to around 10:1 without changing pistons or milling the head. With a thinner head gasket, you could raise your compression pretty easily to B16A levels if you use a GSR head. If for no other reason, I would choose the GSR head because of this. As for the manifold, your B17A manifold won't work. You could, however, use an aftermarket single runner manifold like the Skunk2 or Blox. The only possible issue you might have to deal with here would be smog. But if you already have a ref sticker, the Skunk and Blox manifolds look sufficiently stock to pass during biennial smog testing. But even if you don't have a ref sticker, this setup just might pass.

 

isn't the b17 9.1 CR and how would changing the head make any difference on the CR. i know changing to a thinner gasker can cause a difference in the CR. i believe the b16a2 and b18c1 both have a 10.1 CR. my best guess is a b16 head on a b17 block with CTR pistons.

 

I think the difference in c/r is due to pistons and stroke. As far as i know all PR3 heads are the same.