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my cousin was asking which head to recommend on his LS block, b16a or b18c1, and i have no clue what to tell him. or does it even matter. he has the LS block and his ek hatch ready to go but we're just waiting for a vtec head.

 
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B16A

 
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People say that the b16 head flows better cuz of the intake port angle, but the b18c head will give you more compression thats a fact. Best scenario is to get the b16 head and install ITR pistons on it= better flow and good compression.

 
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the B16A head does work the best, but the compression is all relative to what your plans are with the engine. if u just want GOOD OL streetability, than leave it alone, or get new internals that wont raise your compression past 10.0:1. if you want to go turbo, then your gonna wanna get aftermarket internals that are stronger/more durable, but dont increase the compression. and if you want to go all motor, youd wanna get all new aftermarket internals that are much stronger, and increase the compression ratio somewhere in between 12-14:1... i think? be VERY careful though runnin high compression ratios....easy to blow up the engine if not taken care of properly.

 
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I'd also upgrade the pistons and rods to be able to rev safely. You can get away with not doing it, but I personally would change them out.

You're going to have the engine out and the head off, so why not?

And I'd do a B16A head for flow and compression, unless you port the B18C head.