Webers on a 289 from Shelby Engine

[Earl J]

I run a 289 +.030 (292 and change) with an Original set of Italian 48 IDA’s circa 1964-65 (not IDA-1’s or IDA-4’s)carrying serial numbers; 983, 985, 1031 & 1035. A true early set. Mine are not drilled for the 3rd progression holes and they do have the screw down type accelerator pump jet nozzles, not the modern push-in type. No issues. I drive this car regularly (it is a GT350 not a Cobra) This motor is still in the car. I did consult with Jim Inglese 4-5 years ago for a base line for jetting but I have since modified it accordingly. I did this past year build a new engine; an 8.2 deck 4 bolt main block, steel 3.25 stroke big bore (I won’t call it a 331 though) which was designed for these Webers. I have yet to install and run it. The 289 on the other hand is still fairly running strong and trouble free (tuning wise). So we’ll see possibly later this spring for an engine swap.

Earl J