Hey, my shortblock is stamped d15b1, but the valvecover says 16valve. what does this mean?

i searched but am still not sure

 

All 88-91 Civics had the 16v head.

d15b2 = dx
d16a6 = Si

Not too sure about the 1, but I assume a HF motor.

 

isnt the HF an 8 valve motor?

 

the HF, otherwise known as D15B6, is an 8 valve engine with flat top pistons that have 2 valve reliefs per piston (MPFI). the D15B1/D15B2 are 16 valve DPI engines with 16 valve-valve reliefs. an interesting fact however, is that the D15B8 (92-95 CX) has an 8 valve head, but with 16 valve valve reliefs on the pistons, leading to the slightly lower compression its rated at. If someone were to confirm that a VTEC head's valves would clear the HF's pistons with missing valve reliefs, you could slap a VTEC head on a D15B6 block and have even higher compression than with a normal flat-topped D15 mini-me

 

I think it has been confirmed that 16V heads (at least the B2/A6 ones) will not clear the flat top pistons.

-Dustin

 

Z6/Y8 heads will clear the D15B1/B2/B8 flat top pistons....and i've "heard" of HF mini-me's.. but that is not yet confirmed..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by skud_dusty &raquo;</TD></TR><TR><TD CLASS="quote">isnt the HF an 8 valve motor?</TD></TR></TABLE>

Yes. But it was never available on an actual Civic. Only a CRX.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91civicDXdude &raquo;</TD></TR><TR><TD CLASS="quote">and i've "heard" of HF mini-me's.. but that is not yet confirmed..</TD></TR></TABLE>

It is entirely possible that someone may have Dremelled valve cutouts on HF pistons.