Hi there!!
I bought 2 quadrajet cores on the internet to build one or both for my '76 chevy pickup driver.
The numbers were almost identical, the Rochester is 7045213 YA and 1605 stamped under.
The Carter is 7045213 with CG YA stamped under. 52009 is stamped on the throttle plate.
This number shows up in my factory manual for Federal use in 1975 or 1976, I don't remember which.
I thought I would use the Carter because it had a 1/4 hose fitting for EFE next to the driver idle screw, which the Rochester doesn't.
The measurements on the Carter are:
idle tube .037
idle channel .075
upper idle air bleed (main body) .085
upper idle air bleed (horn) .046
main air bleed .046
main air bleed (horn) .042
main jet 64C
primary metering rod .044/.026
The bypass air is plugged on both sides
MY rebuild kit came today. 76 mains and 44B rods were provided with an APT screw as well.
I need to know if the idle down tubes are too big, and I'm pretty sure .032 is big enough for the idle tubes.
Please let me know if I should redrill the bypass holes, if I should change the down tubes, and reduce the idle tubes.
I forgot to mention, the engine has an RV cam and Edlebrock manifold with EGR.
Thanks,
Greg Carter