I have 3 Holley Carbs with GM numbers on them. I am trying to figure out what they were from and what years? All 3 carbs have the same part # but the other #'s are different.
The number is 38782610-EH
1) has 3310-A and 753
2) has 3310-A and 644
3) has 3310 and 051
If anyone has any info on what these are from it would be greatly appreciated.
Thanks in advance.

Brent;

The 3310 Holley was originally installed on the `65 Z16 Chevelle with the 396 engine, of which just over 200 were built. As it would turn out, that 3310 carb is one of the most versatile carbs Holley ever produced, and as such it soon made its way into speed shops as an over-the-counter replacement carb.

Your carbs are early "service replacement" dated units, meaning they were either sold over-the-counter at a speed shop or perhaps even a dealership.

Your date codes break down as follows:

753 is the 3rd week of May 1967. 7 being the year of the decade, 5 being the month, and 3 being the week of the month.

644 is the 4th week of April 1966, making this one a pretty early service carb

051 is the 1st week of May 1970.

Fantastic street/strip carbs, but not production dated so there's no value there from a restorers standpoint.

Hope this helps.
Eric

That's great.
At least I know that they are not $1500 carbs that I would end up selling for $150. I appreciate the help. This site rocks!!!!!!