Hi folks, I'll try not to waste to much of your time.
I'm helping a friend work on his '74 GTO. It was built in California. We have pulled the engine and ran the casting numbers 488986= 400ci, The numbers stamped in the front right of the block are 186905 ys = 400ci. Pulled the heads, measured the bore, 3.875 = 350ci. Obviously the bore is boss but why is there a difference of external info? The car was built in September. Is this a 400 block cast with 350 internal moulds? Anyone shed any light on this anomaly?
Thanks in advance.
I'm helping a friend work on his '74 GTO. It was built in California. We have pulled the engine and ran the casting numbers 488986= 400ci, The numbers stamped in the front right of the block are 186905 ys = 400ci. Pulled the heads, measured the bore, 3.875 = 350ci. Obviously the bore is boss but why is there a difference of external info? The car was built in September. Is this a 400 block cast with 350 internal moulds? Anyone shed any light on this anomaly?
Thanks in advance.