I believe the engine serial numbers ran straight through from the beginning of the 1955 til the end. Big Al's serial number is to high at 326.699 for Chevrolet to have reset the counter in late March when the Second Series trucks were introduced to the public.
The other thing to remember is ALL 6-cylinder engines car and truck came out of the plants together.
Doing a lot of head scratching and research my best guess is there were about 1.133 million 6-cylinders made for the cars and trucks in 1955. If you divide that by 12 months and then divide it again by 2 for the number of plants you end up with about 47,000 6-cylinders per month, per plant. If we assume Big Al's engine was built in late May that's eight months into the model year...8 x 47,000 = 376,000 putting it real close to his 326,699. All of this is assuming both plants did a 50-50 split of the load...if Flint out produced Tonawanda then that numbers could be even closer to Big Al's number!
Mike B
