Is this the right alternator bracket?

[G A.]

'69 L-71.

The reason I'm asking is when the alternator is mounted to this bracket, the pulley lines up with the #1 groove on the cast iron crank pulley, which I interpret from AIM is for the short water pump belt. Also, the alternator seems to be too far aft and would interfere with the valve cover when attaching the belt.

Might someone have a picture of the correct bracket (of course assuming this one is wrong).

Dan

[Chris H.]

Re: Is this the right alternator bracket?

Dan, here's mine for comparison. 'IMG_6998.jpg69 L71 VIN 10255.

[Joe L.]

Re: Is this the right alternator bracket?

'69 L-71.

The reason I'm asking is when the alternator is mounted to this bracket, the pulley lines up with the #1 groove on the cast iron crank pulley, which I interpret from AIM is for the short water pump belt. Also, the alternator seems to be too far aft and would interfere with the valve cover when attaching the belt.

Might someone have a picture of the correct bracket (of course assuming this one is wrong).

Dan

Dan------


Usually, these brackets have a casting number embossed on them. What's the number on this one?

[G A.]

Re: Is this the right alternator bracket?

Thank you Chris!!

Joe, I just got back to the house. I wil pull it off the motor in the morning and post all of the markings/numbers.

Dan

[G A.]

Re: Is this the right alternator bracket?

Dan------


Usually, these brackets have a casting number embossed on them. What's the number on this one?

Joe, no numbers anywhere. The only marks in the casting are the capital letter E inside of a triangle and in another location the marking "G.M."

[Joe L.]

Re: Is this the right alternator bracket?

Joe, no numbers anywhere. The only marks in the casting are the capital letter E inside of a triangle and in another location the marking "G.M."

Dan-------


My recollection is that the GM #3882810 bracket had the number embossed on it. However, I'm not 100% sure.

[Chris H.]

Re: Is this the right alternator bracket?

Joe, you are correct as seen in the photo. ChrisIMG_7346.jpg

[Ron G.]

Re: Is this the right alternator bracket?

Dan,

It certainly looks like the correct bracket. Need to check the number on it to be sure it is not a replacement, but the factory installed.

- Ron

[G A.]

Re: Is this the right alternator bracket?

Just curious, but the bracket that Chris shows in his photo looks different. The two arms that support the lower boss on the alternator look like they are moved forward in comparison to the one I have.

[Joe L.]

Re: Is this the right alternator bracket?

Just curious, but the bracket that Chris shows in his photo looks different. The two arms that support the lower boss on the alternator look like they are moved forward in comparison to the one I have.

Dan------


My guess is that yours is for a different, non-Corvette big block application. I can't confirm that without a part number, though, as I am not familiar with all of these brackets.

[Patrick B.]

Re: Is this the right alternator bracket?

The 65 396 bracket has GM on it but not the part number. Also it holds the alternator in a different fore-aft position. I think the idler belt and the alternator belt are swapped on a 396 relative to a 427 with the 3882810 bracket.

[Joe L.]

Re: Is this the right alternator bracket?

The 65 396 bracket has GM on it but not the part number. Also it holds the alternator in a different fore-aft position. I think the idler belt and the alternator belt are swapped on a 396 relative to a 427 with the 3882810 bracket.

Patrick-----


It could be the 1965 L-78 bracket. That bracket was GM #3863138. It was discontinued without supercession more than 30 years ago. The 3882810 "lived on" much longer and the fact that GM chose not to replace the 3863138 with the 3882810 for SERVICE implies that they did not consider it a suitable replacement.

[G A.]

Re: Is this the right alternator bracket?

The 65 396 bracket has GM on it but not the part number. Also it holds the alternator in a different fore-aft position. I think the idler belt and the alternator belt are swapped on a 396 relative to a 427 with the 3882810 bracket.

Well that's interesting. What should I do with this thing?

I'm starting my search for the bracket that Chris was kind enough post a pic of.

Thank you gentlemen for your help.

Dan

[Patrick B.]

Re: Is this the right alternator bracket?

Well that's interesting. What should I do with this thing?

I'm starting my search for the bracket that Chris was kind enough post a pic of.

Thank you gentlemen for your help.

Dan

Dan;
The 65 396 bracket is quite rare, and is probably worth a lot more than the 427 bracket. I'm sure parts sellers that have a 427 bracket would be very happy to trade for yours.

[Joe L.]

Re: Is this the right alternator bracket?

Dan;
The 65 396 bracket is quite rare, and is probably worth a lot more than the 427 bracket. I'm sure parts sellers that have a 427 bracket would be very happy to trade for yours.

Patrick------


Yes, but we have to keep in mind that this may be a bracket for a non-Corvette application. I think that some of the pre-1969 other Chevrolet brackets were similar.