392 hemi identificayion

[jim d]

getting ready to put a hemi in my 56 studebaker truck,found what looks to be a 392, based on bore size but the stamped sn is Z465??. the heads have bosses for the cross over but the passage is not open or drilled for bolts. anyone hav any idea what this is ?

[George]

There should be a casting # on passenger side between head & valley, near the back usually 6 digit, & a code at front left of block ahead of valley. If it has 4" bore & no water crossover it could be a 354 bored out,or a 392 w/ 331/354 truck heads. many truck heads were made like the pre 54 car heads with no cross over