Gm block Identification Hlp

[matt80cg]

Heya,

Well just looking to get alittle information on a 350 block that i accuried. Im not sure what the engine came out of but the id numbers i found are "T0209 HI" and "GM 3944660".

 

Im sure that the id "T0209 HI" means Tonawanda, N.Y. feb 9th.... but not sure on what the "HI" means and i cant seem to find and info on the other number.

 

Well let me know if u have any knowledge that ur willing to share.

 

Thx again

[GMstrong]

Be sure that you wrote down the right numbers i only came up with 3914660 which seems to be a 327.is it a 2 or 4 bolt main.

[Z45]

2 digits suffix codes are pre-1970 engines.

 

HI is one of 2 possible engines, 327 or 350.

 

1965 Corvette 327-250HP Base Engine with Carter Carb, A/C

1968 Impala 327-250 HP RPO L73 manual trans, 4-bbl card

1969 Impala 350-250HP RPO L65 manual trans, 2-bbl carb <---------------------

[desrtrat]

try here..

 

http://www.chevy-camaro.com/chevy-camaro-engine-codes.asp

[oldschool327]

Check the bore size that will help narrow which one it is.

[matt80cg]

Ty everyone, it is "GM 3914660". So from looking on afew sites it seems that this cast number works for the 327 and the 350 2 bolt main within the years of 68-79. Now the question is how do i tell which block i have.

Oh yeah pulled afew more cast numbers off the rear of the block :

T16

660

N

H4 638

T

if anybody has any info on id'ing the difference between the 68-79 327ci and the 350ci ..

thx again for the hlp

 

Update : after calling the buddy of mine the engine came from, he told me that it was more than likely a 327 block but if he recalls it has 350 heads and a 350 crank and is bored .30 over. not to sure but is that even possible.

[desrtrat]

if anybody has any info on id'ing the difference between the 68-79 327ci and the 350ci ..

thx again for the hlp

 

Update : after calling the buddy of mine the engine came from, he told me that it was more than likely a 327 block but if he recalls it has 350 heads and a 350 crank and is bored .30 over. not to sure but is that even possible.

 

the difference between the two was the crank stroke on later 327's. the 327 and the 350 both have a 4" bore. the 327 stroke was 3.250" and the 350 is 3.480" so IMO if it had 350 heads, 350 crank then you have a 350 motor..when GM came out with the 350, they still had a boat load of 327 blocks. so saving on recasting new ones it was cheaper to just make new cranks. and the older 327's came factory stock with forged cranks and rods, small main bearings. with a good balancing it was good to over 7500+ rpm