Re: More 840 head questions...
I get the impression that Colvin is saying that the 291 head replaced the 840 head in production at X date and also became the service replacement for the 840 when that occurred. From the information on the 840 head, Colvin leads you to believe that this date was around May 1969. If that was the case, you should start seeing 291 heads in cars built July-August 1969 as the stock of 840 heads was depleted. Terry's observations from his own L-71 roadster tends to support that...
Fact is that I haven't seen too many solid lifter 1969 Chevys that were built after July 1969... I know that they're out there, I just haven't seen them. This is definitely something that I plan to research. I did find it odd that the late build Corvette that I looked at still had 840s in mid-December 1969. You would tend to think that any 840 heads left in inventory would have been used long before this. I have e-mails out to a few other people on this topic; perhaps they can shed some light when they reply.
By the way, how goes the buildup for the PSMCDR? As I said before, I'm impressed that you've decided to go with the AMA specs for the certified stock class of this event... I hope that you do well!
Regards,
Stan
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