Newbee here, I'm trying to settle a disagreement, I say No they didn't, he says yes they did, that they made a 400 BB & a 402 BB, i said NO, The only "true" 400 ci CHEVY was a SB, the 402 was a bore out "detuned" 396, Am i right or wrong? He is going off what chiltons said, but i think is was a bit confusing at the time of the crossover in these yrs. as to what was truely what. If they did, I would like to know the rundown on bore & stroke.

 

i dont believe chevy made a 400 big block.. but i just thought.. doesnt ponitiac have a 400 big block?? its all GM made.. i know chevy did have the 396 and the 409

 

I must be on the wrong forum lol, alot of veiwers & only 1 reply.

 

this forum is more slower then most others..you'll get ur answer but it might take a day or 3...

 

the actual displacement on the chevy trucks which had the 400 emblem on the fender that were big block was 402 cubic inches.Which were used in 1970-1972 chevy trucks