PSMCDR...new "tech"

[Ray Morrison]

Stan,
I do not have any casting numbers, but looked at production numbers on the 67 L-88 Corvette, and find both the L-88 & L-89 options with production beginning in February, 1967. According to this information, 20 L-88's & 16 L-89's were built with these options? I know this doesn't fully answer your question, but this might be of help?

Concerning the exhaust valve size on the 842 aluminium heads, my reference lists them with 1.84 exhaust, also? These are Closed Chamber Aluminum Heads with 106.8 CC's. While looking for information on the 842 heads, I did come across another aluminum head casting number with no application, I did not know existed, that being 838. Is this the L-89 head? Does anyone have the specs. on these?