[1965velleSS]

I'm trying to get a definitive answer on this big block. If you can help it would be much appreciated. I've been told its a 396/325 hp, 396/425 hp, 427/385 hp....If you need more info, just let me know what. Thanks

casting # 3855961 and engine suffix code T042IEM 153170
2 bolt main

 

[Mike]

Get the date code
EM 66 396 Chevelle 325 L-35 Power Glide 4-Brl A.I.R.
EM 67 396 Chevelle 325 L-35 Power Glide 4-Brl A.I.R.
Someone was thinking that the IE was the code but the I is actually a 1 in the date code
Tonawanda April 12

 

[Dean]

"EM" code was used on 66-67 Chevelle - 396 - 325 hp - 4bbl - automatics


oops, Mike was typing while I was looking it up

 

[Bunz-T]

I think.......

EM.......1966 chevelle with PG Base HP
3855961........Used from 65