PSMCDR...new "tech"

[Rowdy Rat]

Ray,

I agree with you completely on this topic. The burden of proof for this combination lies with the owner and currently, I am unaware of any documentation which confirms that any 1968 L-89 Novas were built. I also have my doubts (as it seems you do) about the 311 1969 L-89 Novas supposedly built. I'm afraid it's too much of a coincidence that the exact same number of 1969 L-89 Camaros were built and that the engines carried an identical broadcast code. While rare, you would also think that a few documented examples would have surfaced by now (L-89 Corvettes, Camaros, and Chevelles have); I am not aware of any at the present time. Anyone else know of one?

As far as the L-89 heads (casting 3919842), you are correct again Ray. The heads have a few changes that improve performance over the 840 heads normally used. A pair of 842 heads are typically about 72 pounds lighter than a set of 840 heads which will certainly help with weight distribution. The exhaust valves are 2.19/1.84 (vs. 2.19/1.72 in the 840) and the intake port has been slightly revised to improve port flow. In addition, I believe the chamber volume of the 842 head is a bit less which should bump the compression ratio somewhat (going from memory on this one - will verify this). Obviously, the 842 heads offer several advantages over the 840s.

If anyone has additional information on L-89 Novas, I'd love to hear about it!

Regards,

Stan