Reading Engine Stamping/markings on Chevy Block

[@boyerohana6629]

What does the 41 next to GM mean?

[@JayFletcher-f4i]

The engine ID# is stamped on the front right side of the block near water pump port

[@markfiddyment1948]

L is November and M is December, the reason for this is the letter I was not used as it could be mistaken for numder 1

[@billybob5171]

Great video man all you other smart @$$ es shovel it least he is trying to help people

[@davidcollis4758]

D=Dayshift N=Nightshift 3 is possibly 3rd shift.

[@kblopp]

Night shift is 3rd shift

[@kevinevans4367]

There was only 2, 10 hour shifts

[@cardinalRG]

@@kevinevans4367 --What was the reasoning for denoting the time-of-day shift on the block?

[@chicanou-turn5056]

It could be a 302 a 327 or 350 That number hits for three different numbers for three different kind of motors that ranges from 69 I want to say through 72 but it’s not just a 350. It all depends on the front numbers the back numbers on some of these engines will hit to only one motor if it hits to more than three it could be one of the three and you have to decode it from the front

[@Llothedon1]

Where do I look for numbers on front of engine I’m trying to figure out which engine I have

[@chicanou-turn5056]

@@Llothedon1 On the front of the passenger side head There should be numbers on the block in the front

[@Llothedon1]

Casting number back of block is 3932386 front of block is 9y00190822fb

[@chicanou-turn5056]

@@Llothedon1 The one on the back matches a 302 a 327 and a 350 The number you gave me in the front doesn’t even match or you sure you’re looking at the right number because there are two sets of numbers the first it will tell you what year the engine block with made the second set will tell you exactly what kind of car and which one exactly motor it is

[@Llothedon1]

@@chicanou-turn5056 yes those are the numbers in front of block

[@ggraven1]

Passenger front extended lip underneath head gives the actual block information. Tells what it is and what kind of vehicle it was. Car Truck

[@phillipthethird42]

Cool, this helps me with my block.

[@davidquirozelojo]

I bought a 85 C10 and it does not have the original engine. Is there any way I can determine which engine is in there?

[@ggraven1]

It actually could be a 302 Z28 or 327 or 350 2or 4 bolt main. 3970010

[@100amps]

3 might be shift # if they were running three 8 hour shifts /day.

[@2HacksGarage]

Subbed, great video 👍🏻

[@syzygy9]

N stands for Night shift and the D is for Day shift.

[@darrenveit7065]

The d and the n part is day or night shift

[@MichaelHayward-ym8ht]

Hay i have this sbc block 3970010 k0309t5b t04515098 any one know what i got here.

[@rickwilson8354]

I have a small block Chevy came out of a 69 Corvette the front passenger side on the ledge number is V is Victor 091 ocla can you help me out

[@larrywilson9966]

D means DAY--N means Night

[@jeffhenry7306]

Is this Block 2 or 4 bolt Main?

[@picklesgarage]

4 bolt main. I've been fortunate even my mystery blocks have all been 4

[@masonmcnair1580]

My motor date says G 257 what year is mine

[@ClownPatrolOU812]

It depends on the characteristics of the block & what era or decade it was made in. That date code is July 25 of 1967, 1977, 1987 or 1997. Having a casting number to go along with this would help as some casting numbers were only made in certain years or for a certain period of time but you can exclude the 90's right off the bat if it is a two-piece seal and not a one piece seal. Other information like suffix codes from the stamp pad in front of the passenger side head or like the casting number of the heads that were on it as well as the intake manifold as well as some other little characteristics that were unique to certain castings or years. See where I'm going with this? Good luck and happy hunting 🫡😀

[@chrisjarvis4449]

weak video d and n with a clock ya like the one poster was saying how about day or night ya and like the other poster was also saying up at the front of the block on the head surface that's were all the real info is as to what it came from and what it is but if it has been decked then it may be gone but the ol acid trick will let you know but be aware there are some out there that re stamp no.'s and some are better then other at it when its worth money then its worth faking

[@dannystutts3453]

G.j y

[@jameshester1450]

Don't take a genius for that