ls/vtec

[yeaiwonder88]

Which Builds more power out of a stock motor.....

Is it the

b18c1 head
b18c5 head
b16a2 head

On a stock ls block get back looking to do an ls/vtec soon so hurry need to know what to get

[Negrodamus]

My guess is the b16

[D16Civic]

^^thats what ive seen used the most

[yeaiwonder88]

Yea but most people only go with the b16 because its cheaper i know it gets better are flow than the gsr but im also talking about the ITR head also

[yeaiwonder88]

8. Heads. There are many heads you can use and there are little differences between them.

First off there is the GSR head which give you a higher compression than the other b-series heads because of its 41.6cc combustion chamber. The smaller combustion chamber makes .2 more compression. Then there is the b16/17a head which are the same the only difference is that the b17a has a p61 stamped on the back of the intake manifold the b16/17a head is a better flowing head 5.25% in fact and a larger combustion chamber 42.7cc's. Then there is the type r which flows even better than the b16a head and has the same combustion chamber. To put this in perspective the b18a/b has a 45cc combustion chamber.



9. GSR Block Girdle. You can use the GSR block girdle on the ls. This will reinforce the bottom end and keep the moving parts in its place. All you need to get is the 3 main caps in the middle, bolts, windage, oil pan and oil pick.



10. Pistons. You can use any b-series vtec piston in your ls block. Any 1.6 b-series piston will be raised by about one full point in the ls block like the b16a(pr3 pistons will raise it from the stock 10.2 comp in the b16a to 11.2ish in the ls block so keep this in mind when building the ls block. Also keep in mind about the combustion chamber size (See heads) when building the motor. . With a GSR, add .2 comp to the stock ratio. (Warning: these are all estimates: they could be off a little).

B16a head and pr3 pistons 11.2

B16a head and p30 pistons 11.4

B16a head and p72 (ao) pistons 9.9

B16a head and p72 (00) pistons 10.5

B16a head and p73 (ao) pistons 10.7

B16a head and p73 (00) pistons 11.2

B16a head and p61 pistons 10.4

B16a head and pct (CTR) pistons 12.2-3ish

B16a head and pr4 pistons 9.5

Add .2 to all to calculate the GSR head with all of these.

Type r and b17a heads have the same combustion chamber so calculates the same.

[yeaiwonder88]

yea umm just wondering cause everywhere i look it says the gsr gives higher compression and was just wondering

[Vteckidd]

if your doing a BONE STOCK LS bottom end, use the GSR head so your compression will be higher. i think a LS bottom end with GSR head is 10:1. i would change the valves out to some flat faced Omnipowers to get it around 10.3:1 if you are staying all motor.

GSR head is a Better head than the B16. the old excuse "b16 head" flows better than a GSR is BULLSHIT. dont belive any of it

[JDMracer16]

why would the b18c give higher compression when the b16 head is a small displacement head.

[Vteckidd]

cause the GSR head has a Square Combustion chamber with quench pads compared to the B16 head which has a round combustion chamber.

Discplecement comes from the Block and Bore/Stroke, not the head. the fact that a B16 head is on a "smaller" motor just means that (in this case) the B16 has a smaller stroke vs the 87mm GSR crank.

[LS2ner]

alot of people say "use the b16a1 because u can make a poor mans ITR!" but from what i have read and heard the GSR makes a better combo. b16a and b18c/5 heads ive heard have the same spec's basically but who knows.