Need Help Decoding Engine #'s - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dave3156 · 02-19-2005, 01:17 PM

Looking at doing it again - pulling out a perfectly good built 350 for a big block. If anybody has a book, it would be greatly appreciated if they could give me the year and description of this 396 motor. The #'s I was given are: Block - 3902406 Date E 18 7 Hi Perf block. Head - 3909802 Date D 6 7 Thanks.

**John Fabris** · 02-19-2005, 01:45 PM

block is a 1967 396, HP range (325, 350, 375) and can be 2 or 4 bolt.
heads are for 66-67 396 (hp 325 or 350), OVAL PORT - Valve size 2.06 intake, 1.72 exhaust.

If you can find a number that is located just in front of the passenger side head, where the head and block meet, that number will give you a good idea what this engine was in from the factory.

dave3156 · 02-19-2005, 01:49 PM

The guy I'm getting if from said it came from a Chevelle. Thanks for the help!

02-19-2005, 01:17 PM	#1
dave3156 Registered User Join Date: Mar 2004 Location: St. Louis, MO Posts: 336	Need Help Decoding Engine #'s Looking at doing it again - pulling out a perfectly good built 350 for a big block. If anybody has a book, it would be greatly appreciated if they could give me the year and description of this 396 motor. The #'s I was given are: Block - 3902406 Date E 18 7 Hi Perf block. Head - 3909802 Date D 6 7 Thanks.

02-19-2005, 01:45 PM	#2
John Fabris TOTY 2006 Join Date: Dec 1999 Location: Magalia CA USA Posts: 2,270	block is a 1967 396, HP range (325, 350, 375) and can be 2 or 4 bolt. heads are for 66-67 396 (hp 325 or 350), OVAL PORT - Valve size 2.06 intake, 1.72 exhaust. If you can find a number that is located just in front of the passenger side head, where the head and block meet, that number will give you a good idea what this engine was in from the factory. __________________ John Fabris 67 C10 SWB

02-19-2005, 01:49 PM	#3
dave3156 Registered User Join Date: Mar 2004 Location: St. Louis, MO Posts: 336	The guy I'm getting if from said it came from a Chevelle. Thanks for the help!



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