General Category > Quadrajet Carb Talk and Tips

POE changes for a 4-speed

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70GS455:
Would you recommend plugging the secondary POE holes and re-drilling them below the flap for a 4-speed vs the standard flap cutouts?  Seems it would do slightly better

Cliff Ruggles:
Does it have any hesitation/stumble/bog going quickly onto the secondaries?

70GS455:
Well since the engine is not together yet and I haven't sent the carb in to you yet....no lol. Was just trying to plan ahead

Cliff Ruggles:
POE holes below or directly in line with the airflaps is the best scenario, and this was done on many of the factory "high performance" Q-jets including the Stage 1 Buick and most Pontiac carburetors thru 1979.  Pontiac even used slotted flaps for quite a few years, until they discovered that solid flaps with large holes seeing the underside of them was a better deal......Cliff

Dano3500:
Hi Cliff, Dano from v8Buick.com here & my first post on your forum. I don't know much about carbs tbh but have your book & probably need to learn.

As you noted above, Stage 1 carbs (auto & manual) had the POE holes below the flaps. All of the '70 350 4-sp (7040245) carbs I've seen have the holes above the flaps. The 245 does use a different air horn (7038473 for manual 7038474 for auto) than a 350 automatic (244) but I can't imagine that every 245 I've seen (maybe 10 or so - pretty rare carb) has had the air horn changed.

I had my 245 for my '70 GS 350 4-sp rebuilt by Fred Catlin (old Buick racer) and he put on an air horn w/the holes below. I have no idea what it came off of. I am looking to put this carb on a stock "appearing" build, but the internals will be far from stock (higher comp., stroked, big valve ported heads, etc.). What is the functional/performance difference between above/below & is there any reason not to or issues with changing the air horn to one that has the holes below?

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