'67 Imp with a '68 nose

[dardal@xxxxxxxxxxxxxxx]

Quoting Edmund Villasana <edmundv@xxxxxxxxx>:

> I'll check the heads when we pull them, but I have a question.  What are
> 915
> heads and why  would it  be good that I had them?  (sorry, like I said,
> I am
> new to the  world of  Imperials and big  blocks)
>                                                                 Eddie
> Villasana
> 
As Dick B. said, the later (906) heads had larger diameter exhaust valves (1.74 
from 1.60, significant increase) and the intake ports may have been enlarged a 
bit more.  As a result, the 906 should be better for upper end performance at 
the possible expense of some low speed throttle response.
D^2