engine ID help
 

She's a small block not sure on the numbers but we'll see. VO223TXB C6F399213 it might be an old crate engine olmost sure its a 350. but could it be a 400? would a 400 take a different flywheel or would any old small block work? any help would be very appreciated

If I remember correctly, the 400 is internally balanced so you have to use the 400 fly wheel. Other SB fly wheels won't work.

:gmc: :flag:

You have that backwards, all small blocks are internally ballanced, except for the 400. it requires a special harmonic ballancer and flywheel/flexplate.

YUP, I JUST SOLD A 67 WITH ONE IN IT. ;)

Thanks Longhorn, guess thats another brain fart for the day for me. :)
I knew that but didn't think about it before I posted.

so, whats mine then that might be my problem but I dont know if its a 400

she is a 350
1975 TXB 350 conv.cab L LS9 165 4 C-20 to 3500

thanks Ill try a new flywheel in it then.