TO421HC

Don't know if thats an O or a zero. Also, can't read the guys writing so well so I'm not a hundred percent sure thats an H. Can anyone enlighten me?
Thanks

T = Tonawanda engine plant
0421 = April 21st build date
HC = 1969 350, manual tranny, 2V carb, 250hp, L65

Thanks Steve. The guy that has this engine I'm looking at swears it has a 327 crank in it and was told himself that the engine was a 66 or 67 327. Have to do alittle more research I guess.

Jeff, The 66/67 327 block will have the hole in the back of the block for the down draft tube.
It could be a 68/69 350 block with a 68 327 crank.
In 68, 302's 327's and 350 all used the same bore, Just a dif stroke.
Bob J.

I show other uses for the code HC besides the 69 350

65 Impala 327/250 L-30
66-68 Impala 327/275 L-30

Check the casting date ,small raised code top rear of engine, could be either side.Letter for month and numbers for day and last digit of year. (Should look something like D226, Apr 22nd '66)
Also the 68-69 blocks may have a partial vin on the front pad.
The 66-67 327 used the old down draft connector as new connection for in-line pcv valve to carb. Not sure about the 65.

Hey Shooter'
Thanks for the extra info. Just might solve this puzzle. Want to put it my 67 and I would prefer it to be a 66-67.
Jeff

JEFF - MARK HERE / wrencheadblues have that same HC 327 at my house also , it has a/c pulleys and is a double hump heads blk if your looking for one , spokane too. I decoded mine and it is a 66 327 with small journal crank , blk not tore down , but its a builder , not a fresh motor, all tin and a q-jet cast intake. let me know , look forward to meeting you for coffee maybe at dennys on the gieger exit

Jeff, I too have a 66 vette block and heads, If I can help just drop a line. If you want to take a look at that's fine too. Brad

hello - brad , another spokane chevelle guy !!!! DON'T THINK WEV'E MEET YET , look forward to getting together to see each others cars before winter slips in . mark 455-6685