|UPDATED|1/29/2017 2:53:51 PM (AZT)|/UPDATED|


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Can't make out the first letter, but if it is an "E", it is May 3, 1968....if it is "F", it is June 3, 1968. As long as the date is BEFORE engine build date, yer golden. 

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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Hey Mike - just doubled checked 3 different sources and they all point towards the 3919840 number I originally posted for a '69 L71. I also see your reference to the NastyZ28 site. Not sure why the descrepency, but welcome to the world of Corvette "matching numbers". I also found reference to your casting number 3964291 on another website that you might want to check out, www.minuit10.net. They show that casting as '69/'70 427 but do not list it as an L71 435hp application. Same rectangular port, big valves as the 840 casting but the size of the combustion chamber is slightly different. Yours might still be correct, like I said I'm certainly not a BB guy, definately worth more research. The casting date you posted is either E or F 3 8, which equates to a May or June 3rd, 1968. Those dates would be correct for a relatively early (Aug thru Dec '68 engine/car build date of a '69 car. Since the head casting numbers are just one piece of the puzzle, have you ever researched your block casting and engine stamp pad info ?? They should give you further clues as to your L71.

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John Sigmund

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Mike, that is a pic of your engine stamp pad and it all looks great !! The first part T0820LR equates to T for Tonawanda engine assembly, 0820 is your engine assembly date of August 20th '68, very early car and the good news is that it lines up well with the May (or June) casting dates on the heads. LR is probably the best news because that is the engine suffix code for 427 cu.in., 435hp, manual transmission !! The second part of the stamp, 19S729961 is the vin dirrivative. 1 is for Chevrolet, 9 is the model year, '69, S is for St. Louis final assembly and the last six digits 729961 should match the last six digits of your VIN. So if indeed your car is that VIN with a manual transmission, your well on your way to a legit L71. The next things to look for if you want to know more of the puzzle is the block casting number and date code. They are located on the back of the block between the cylinder heads and the bell housing. Casting number is on the passenger side of the block and date code is on the drivers side (that may be vise versa on a BB). Post those #'s and we can decode a bit further.

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John Sigmund

3964291(rectangle port, closed chamber, 396, 402, 427, 454, 109cc chambers), comes up for a '70 LS7 in Corvette, but were also used for the 435. 

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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Cool, Thanks for the confirmation Joel !!

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John Sigmund

|UPDATED|1/29/2017 9:04:13 PM (AZT)|/UPDATED|


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Your welcome, glad to help out. Looks like you've got a great car !!

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John Sigmund

|UPDATED|1/30/2017 1:51:01 PM (AZT)|/UPDATED|


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|UPDATED|1/30/2017 3:08:26 PM (AZT)|/UPDATED|


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