Carter AVS - Square Bore Models - Non Emission

Yes, upper screw in post #5 is an air bleed......& LH thread.
The 340, 383 & 440 low perf AVS were all 625 cfm. My understanding is only the 440 magnum had the 750.
These AVS models were 750: 4428,9. 4617,8. 4637. 4640. 4737-41. 4967,8.