I got 92 hatch b16 block p72 gsr head woundering why thay went this way

 

The magic 8-ball says they bought the block cheap from someone that did a ls/vtec.Then bought a head from someone who blew up their gsr.

 

maybe they wanted a poor mans type r

 

This would what was lelt from a poor mans type r.

 

Maybe he was on the receiving end of a bad deal, worse things have happened.

 

nothing wrong with a b16 running a p72 head. It just wont be as good as the b16 running a b16 head because the casting of the b16 is the same as the type r minus the mild pnp from the factory. P72 heads are great for forced induction, ive heard they offer better fuel atomization but i cant confirm.

 

P72 heads are the worst flowing, so I can't imagine that being so.

 

No there not, people just hate the GSR stock manifold, The GSR head gives more compression, and every time i've seen 2 similar set up's it's the one with the GSR head that almost always has more power. If I remember right @.500 lift at the valve the GSR flows 153.14 cfm and the B16 flows 151.29 cfm. I think that the GSR head has more potential, but the stock manifold does suck.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by superls92 &raquo;</TD></TR><TR><TD CLASS="quote">The GSR head gives more compression</TD></TR></TABLE>

There is your answer, k20rex. The pr3 head will have a 42.7 cc combustion chamber while a p72 will have a 41.6 cc combustion chamber.

This is the route I am taking with my build. The casting is it though. I won't be using the IM, LMAs, valvtrain, cams, etc.

 

Maybe because they wanted to take advantage of having dual runners in a b16, which would help mid range torque.
both heads have their advantages; pr3 has little better exhaust ports, p72 has more quench and personally its intake port is preferred.