3A vs 3A block

[area53 at validpath.com (Jeff Toomasson)]

I don't know how much difference you'll see between the hydro (HT/RD and later)
vs. solid (JH) head, if any, in a street or even medium-modified application. 
But IIRC where the JH distinguishes itself is in the heavily modified (i.e., 
race) applications. The solid lifter valve train is said to be a little more 
stable in the higher revs.

JT
 
> I cannot recall the reason why a 1.8L head is the hot
>setup offhand.
>