right now i have a D15B8 block with a D16Y7 head. I recently got a D16A6 cam for free, and i have a d15b1 head laying around. I am just wondering what anyone has to say about this comparison..

here are some things i know for certain:
The D16Y7 head has larger valves than the D16A6
The D16Y7 head is supposedly the same compression ratio as a d16z6 head, thus higher compression on my engine.

Now the D16Y7 makes more horsepower than the D16A6 in longblock form, but my D16Y7 head seems to float out the valves and run into a wall at about 7000 rpm, regardless of rev limit.

Would swapping to the D16A6 head have any advantages?

 

Bisi told me the A6 head flows the best out of all the NON VTEC SOHC heads.
Smaller valves, but too much valve might shroud flow.

 

so what about the D15B1 head? I was under the impression that all the non-vtec "spark plugs on the back side" heads were from the same casting, and the difference was in the cam?

 

The D16y7 does not make more than the d16a6.

d16y7-106
d16a6-108