Matt68
Well-Known Member
My cast iron intake won’t accommodate my ‘72 Thermoquad. What am I missing?
Intake problems
- Thread starter Matt68
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replicaracer43
Grumpy Old Man
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That intake is earlier. AVS carburetor
Square Bore to Spread Bore adapter.
Not missing anything. That intake wasn't designed for a Thermoquad.
Matt68
Well-Known Member
They are both spread bore. I think, as mentioned, I need a Carter AVS
Matt68
Well-Known Member
Thanks for all the help. I just assumed all 340 intakes were the same. I’ll hunt for an AVS.
The adaptor pictured will work pretty decent. Or u could get a spread bore intake. Kim
1406 Square Bore Edelbrock will drop right on there without having to shim it up.
Nice stock 340 non egr manifold you have there.
Nice stock 340 non egr manifold you have there.
Professor Fate
Push the button, Max...
They are NOT both spread bore. A Thermoquad is a spreadbore carburetor, your manifold is a square bore. You need to either get a Carter AVS/AFB or Eddy carb, or change to a spread bore manifold and use your TQ. Or- use the aforementioned carb adapter.
1970 340 Square Bore Intake
Same style as what you have there.
Same style as what you have there.
Matt68
Well-Known Member
Ok. I thought the larger rear and smaller front openings made it a spread bore. My bad.
This is a spread bore intake. Kim
OldmanRick
Well-Known Member
If you have a good TQ, just look for a decent TQ intake used. Probably can find one local or at a pick & pull for a reasonable price. Heck, you can sell that one and probably come out ahead.
Or put a wanted thread up. You now know what you need for a intake.
This is the normal description given for what is and is not. But this is not accurate and leads people to think what you thought. The “Spreadbore” is a big offset in the butterfly sizes. The square bore carbs can be off set in size a little bit.
Look in the for sale section here for a TQ spreadbore intake for sale. I’m pretty sure there is a few there.
Semantics....Primaries smaller than the secondaries? Yes they are.
That certainly beats changing the intake. Kim
lemondana
BlackDart
This is a Quadrajet adapter, The TQ adapter has more sealing surface on the rear base. If you use this adapter, you can have a vacuum leak in the rear.
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