Originally Posted by homercan2
Got this off a different forum
the B16A head is off either 1st or 2nd gen SiR's and also can be found in some Del sol's known as the B16A3
1 gen B16a1 or B17A(92-93 GSR)
2 gen B16A2
Del sol B16A3
Best used because of better flow through the head
and it will tell you on the head it self it should say above the exhaust ports PR3-1( 1 gen) PR3-2( 2nd gen ) PR3-3 ( 2nd Gen usdm delsol
the GSR head is a B18 head and it will also say above the exhaust ports P72
not good in the flow ports ... too restricted
Type R P73 code
Perfrect flow through the ports
your either better off getting a Type R head.... or if your low on doe get the B16 head and put the type r valvetrain in it, almost like a type R head.... just more affordable
also to get the head to fit right you have to re-locate the dowlpins to the other side .. also tap the oil line and plug it.... get a machine shop to do all this stuff..... there experts in the field or doing that stuff...
go to : www.c-speedracing.com
they have a good article about it
i think they got it from www.diyracing.com??
im not sure if that is the site they got it form... but c-speed has a better way of tell ing you.
hope that helps
I am not sure where this information came from, but all that I have highlighted in BOLD above is completely erroneous and has no factual foundation. The B16A and ITR cylinder heads begin life as identical castings. Where they differ is merely inside the first inch or so from the valve seat... the ITR head has some minor short turn/side bowl work - light hand blend work of the rough casting. The obvious difference between these two heads would be the camshafts, valve springs and "pro-flow" style intake valves.
With respect to the differences between the B16A (PR3 or "30") casting and the B18C1 GSR P72 or "72" casting... the latter has a higher floor on the intake side and thus an easier turn on the short side of the bowl and through the valve. The P72 head out flows the B16A head in stock form. The GSR head will also out perform the ITR head when all ITR parts are installed in it... meaning ITR cams, intake valves and valve springs.
Lastly, ALL VTEC blocks and cylinder heads have the alignment dowels on the same side. The statement above about moving them only applies to building a LS-VTEC or CR-VTEC engine... using a non-vtec block with a VTEC head.