1972 402 BB ID - experts chime in!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**JQ-72** · 03-05-2011, 06:54 PM

I posted this a while back, but I can't find the thread - plus I've discovered more info about it. I bought a complete 402 (disassembled) and everything matches except the block. The heads, intake, ex. manifolds all have similar dates. The block, however, has a 1973 date. Here's the info : casting number - 3999290, casting date - Oct. 1973, suffix code is basically non-existent - I can barely make out a "4". Maybe block was decked?? OK, all the websites I've checked say that casting 3999290 is 70-72 (some say just 72) light duty truck. Here's where I'm lost - date is 1973. I do not believe that the 402 was made after 1972. My 1st thought was the something happened to the original engine when the truck was a year or two old and this may have been a replacement block?? I know I'm being over analytical about this, but what do you guys think?? Here's some pics.

Joshua

03-05-2011, 06:54 PM	#1
JQ-72 Senior Member Join Date: Feb 2001 Location: Killen, Alabama USA Posts: 3,632	1972 402 BB ID - experts chime in!! I posted this a while back, but I can't find the thread - plus I've discovered more info about it. I bought a complete 402 (disassembled) and everything matches except the block. The heads, intake, ex. manifolds all have similar dates. The block, however, has a 1973 date. Here's the info : casting number - 3999290, casting date - Oct. 1973, suffix code is basically non-existent - I can barely make out a "4". Maybe block was decked?? OK, all the websites I've checked say that casting 3999290 is 70-72 (some say just 72) light duty truck. Here's where I'm lost - date is 1973. I do not believe that the 402 was made after 1972. My 1st thought was the something happened to the original engine when the truck was a year or two old and this may have been a replacement block?? I know I'm being over analytical about this, but what do you guys think?? Here's some pics. Joshua Attached Images __________________ 72 Cheyenne Super swb. Factory 402/400,tach,posi,AM/FM, A/C. Adding cruise, 8-track 72 Cheyenne Super swb. 350/350 A/C, bucket seats 72 Cheyenne swb. Factory 402/400, tilt, posi, A/C 72 Cheyenne Super K-10. 350/4 spd., posi. 72 Suburban 350/350 tilt, tach, AM/FM, A/C, luggage rack 72 GMC Sierra lwb. 350/350, A/C. medium green/olive interior



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