Which spacer for 1965 273

[Stumpy]

I’m putting on a carb spacer on a 1965 hi-po 4bbl 273 with the stock intake manifold and a 1403 Edelbrock. Which spacer should I use for this application?

I’m thinking this one?

Edelbrock 8725 Edelbrock Carburetor Spacers | Summit Racing

 

[RustyRatRod]

I’m putting on a carb spacer on a 1965 hi-po 4bbl 273 with the stock intake manifold and a 1403 Edelbrock. Which spacer should I use for this application?

I’m thinking this one?

Edelbrock 8725 Edelbrock Carburetor Spacers | Summit Racing

I'm stumped trying to figure out why a spacer is needed. Maybe pictures would help? Are you just wanting one to try to cool the carburetor off?

 

[Stumpy]

I'm stumped trying to figure out why a spacer is needed. Maybe pictures would help? Are you just wanting one to try to cool the carburetor off?

To cool the carb. Yes. Also I read on the forum that the secondaries don’t fully open with this setup without a spacer.

 

[RustyRatRod]

To cool the carb. Yes. Also I read on the forum that the secondaries don’t fully open with this setup without a spacer.

Gotchya. I will also add I am unsure if the bolt pattern on those early intakes is the same as the later Edelbrock style carburetors and I believe that's what that spacer is for. Maybe someone a little more in the know will chime in on that.

 

[Stumpy]

Gotchya. I will also add I am unsure if the bolt pattern on those early intakes is the same as the later Edelbrock style carburetors and I believe that's what that spacer is for. Maybe someone a little more in the know will chime in on that.

It currently has a circa late 90s 1405 which fits without the spacer. I’m replacing it with the electric choke 1403. I figured I might as well put a spacer on when I’m doing the swap.

 

[RustyRatRod]

It currently has a circa late 90s 1405 which fits without the spacer. I’m replacing it with the electric choke 1403. I figured I might as well put a spacer on when I’m doing the swap.

Ok, well you just answered THAT question! That spacer should work then. Although, I prefer the thick black insulating gasket......but whatever works!

 

[wheelsport]

The spacer also helps get a better seal for the carb base.

 

[65 Cuda 340]

To cool the carb. Yes. Also I read on the forum that the secondaries don’t fully open with this setup without a spacer.

If you have a die grinder, you can open up the throttle bores to 1 11/16" easily enough. Then the throttle butterflies clear w/o an adapter. The Edelbrock has extra mounting holes and will fit early intakes with the smaller mounting bolt spacing. A Holley doesn't have extra mounting holes and requires a spacer to adapt. Here' a 56 Packard intake that I opened up the throttle bores to run a 650 Holley double pumper on what was originally a WCFB intake - and yeah, I needed the adapter for that setup.

 

[toolmanmike]

Yep! open up those secondaries.