2bbl to 4bbl pictorial

[Triple Pickle]

As someone once said, “ Some people have a way with words. Other people,,not, have way, I guess.”
Here’s what I hope is a self explanatory pictorial of how I deal with throttle/kickdown issues by modifying the factory bracket when replacing a 2bbl with an aftermarket intake and 4bbl.
As we see, the height difference is where the heartache begins....also note how much higher the thermostat is on the aftermarket intake.
This is a 360 2bbl intake and a aluminum Wieand 2p 180 intake side by side comparison. Accessories such as AC compressors may be affected by such modifications as well.

 

[Triple Pickle]

Intakes sitting on a flat surface, measure the difference.,,

 

[Triple Pickle]

This mess will not work. This is a Carter AFB. Different carbs, different issues. Check the carb you’ll be using for different measurements.

 

[Triple Pickle]

Cut the part of the bracket where in bends. Use flat bar of similar dimensions to add the heights you need. In this case it was 1.25”

 

[Triple Pickle]

Using the old intake for a fixture, bolt your new tabs down through the holes where the original bracket bolted. Then clamp the bracket to them and tack weld. Check to see if it lines up with the carb before final welding.

 

[Triple Pickle]

Beat to fit, paint to match!

 

[Triple Pickle]

Also, you’ll have to extend your kickdown rod that goes under the car to the transmission. This is important if you want your transmission to last.
IMPORTANT: ALWAYS MAKE SURE YOUR THROTTLE LINKAGE WORKS FREE AND RETURNS TO IDLE POSITION. Spend more time checking that than anything else in this pictorial!!!

 

[Davea Lux]

Nice clean job.

Dave

 

[Triple Pickle]

Square carb to spread “universal intake” helper.

 

[Triple Pickle]

Nice clean job.

Dave

Thank you, sir. In my short time on this forum I’ve grown to appreciate your knowledge, experience,and patience.

 

[thrashingcows]

Nice custom work there....that will get you where you need to be on the swap. ;)

 

[413]

Good photos and step by step, thanks for doing this post!

 

[CBODY67]

Thanks for the pictures and graphic instructions. Any particular reason you selected the manifold you did? Just curious. It appears to be a "high rise" rather than OEM replacement. The manifolds which have the thermostat housing as the one you have is for the RV-2 OEM compressor as the later Denso compressors have the mounting flange rotated a bit for compressor mount clearance. Or have the dual locations as the Edelbrock Performer LA intakes do.

Thanks,
CBODY67

 

[Trace 300 Hurst]

Similar situation regarding my Performer 440 intake. The carb flange height is about 1 3/4 inch higher than OEM, which necessitated raising the throttle cable mount the same distance. Otherwise, the cable and carb linkage clashed and didn't operate in "harmony".

Kickdown actuation was generally unaffected, but must be carefully studied for correct movement and adjusted accordingly.

OEM bracket height:

Raised, welded bracket height for Eddy 440 Performer intake:

 

[Triple Pickle]

Thanks for the pictures and graphic instructions. Any particular reason you selected the manifold you did? Just curious. It appears to be a "high rise" rather than OEM replacement. The manifolds which have the thermostat housing as the one you have is for the RV-2 OEM compressor as the later Denso compressors have the mounting flange rotated a bit for compressor mount clearance. Or have the dual locations as the Edelbrock Performer LA intakes do.

Thanks,
CBODY67

I already had this intake on a parts vehicle. I wouldn’t call it “high rise” at only 1.25” over a stock 2bbl. I consider a high rise to be a single plane that is 3 or more inches over stock.
I reckon an OEM replacement wouldn’t require the butchery shown here.

 

[CBODY67]

Thanks for the information. To me, a "high rise" is like the old OEM Camaro Z/28 4bbl factory manifold, which was higher than the normal 4bbl intake. Enough higher that the factory air cleaner base pretty much engulfs the 3310 Holley that came on those engines. A fill 1 inch lower than the more common aftermarket knock-offs.