Hello all. I have a buddy who was just given a complete running big block. We were told it was a 454 but after running the numbers I can’t tell if it’s a 396 or 402, some info I found even said 427.

casting number is 3969854
number on the passenger front is T0503TKB

Any help would be greatly appreciated.

 

1971 truck 10-30, 402 cu in, 310 hp, 400 trans
1972 truck 10-20, 402 cu in, 210 hp, 400 trans

Year of truck can be determined by the casting dates

 

Thanks, that’s what we were leaning towards. what does the “10-30” mean? I saw that listed on the chart I found but no explanation.

 

Series 10 is 1/2 ton
20 is 3/4 ton
30 is 1 ton

 

That makes perfect sense now. I don’t know why I didn’t think of that.

 

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