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yenkogreg Feb 11th, 08, 06:48 PM I have a 386 block and the cylinders measure 4.006. Could anyone tell me the measurement for standard bore. Also the date is M-27. Which month is M? The stamp pad is: V0924DZ and has a VIN for an 1969 Norwood car. The M is confusing me. Looking for help. Thanks in advance! RamAirDave Feb 11th, 08, 06:52 PM Casting dates can be difficult to read. It could be an "H", which would make sense. Std. bore is 4.000" Edit: apparently there is an M code I knew nothing about :thumbsup: Kurt S Feb 11th, 08, 06:56 PM http://www.camaros.org/drivetrain.shtml#BlockCast Read the M-coded block section..... yenkogreg Feb 11th, 08, 07:04 PM Very interesting. Thanks! "M"-Coded Blocks There is one exception to the normal block casting date convention that has been observed: some blocks have been seen with "M" cast codes. Research by the Saginaw Metal Casting Operations of GM Powertrain Division has found that these "M" codes are not date codes, but actually a foundry code used to indentify parts that were made to evaluate a casting process change. After evaluating the parts, the blocks would either be destroyed or released into production. There is no way to determine the date an "M"-coded block was poured. 69CamaroRT Feb 11th, 08, 11:49 PM yenkogreg, is there a vin stamp on the block? im looking for my original block and was just curious to see. thanks Kurt S Feb 12th, 08, 07:02 AM Can I get a picture of the engine pad? Thanks! yenkogreg Feb 12th, 08, 09:16 AM 19N515235. I am selling the block on Ebay with lots of pics. It would be great if this was your block. Good Luck! 69CamaroRT Feb 12th, 08, 10:25 AM only about 1100 from mine. here's the link:http://cgi.ebay.com/ebaymotors/1969-386-DZ-Block-Chevrolet-Camaro-Z28-302-4-Speed_W0QQitemZ270211388886QQihZ017QQcategoryZ1406 82QQssPageNameZWDVWQQrdZ1QQcmdZViewItem thanks greg Kurt S Feb 12th, 08, 11:30 AM Greg, That VIN is not in the database. Sent you a PM. gene_sc Feb 13th, 08, 03:12 PM http://www.camaros.org/drivetrain.shtml#BlockCast Read the M-coded block section..... Kurt I was reading 'Camaro Restoration Guide' by Jason Scott pg 160 and it says that 'M' = dec and that 'I' was skipped as a month code??? I seem to remember from another casting number book 'I' ws skipped due to confusion with '1'? are the casting number books incorrect??? Jonesy Feb 13th, 08, 03:57 PM That book needs to be updated. M code is as stated above by Kurt. "I" was used and is Sept. Kurt S Feb 14th, 08, 02:03 AM Lot's of guesswork out there about M-coded blocks. The books are wrong..... | ||