jensenracing77

This is a service replacement carb. 3072 date. I know for sure it is not a restamp. It had a poor stamping. I can not tell if it is an 8 or a 6. It looks mostly like a 6 but in the sun just right it looks like an 8. I found it on a 70 350 4 speed engine that sit in a barn since the late 70s. The engine (not original to the car) was found in a 70 W-30 automatic and removed in the late 70s. Is there any way to tell what it is by rods or hangers? were there much difference between the 0258 and 0256? I do not think this carb was ever apart. If it was they didn't scuff the screw heads.

I had planed to use it on my W-30 but if I can figure out for sure it is a 6 I may try to find an 8 and sell this one.

BlackGold

FWIW, The stamp looks like an 8 to me.

The '258 carb was used on automatic W-30s. If Rochester built the replacement carbs like the originals, it will have .070 primary jets and the 3-step primary metering rods (can't remember what size). The 3-step rods were unique to 1970, so it wouldn't surprise me if they built replacement carbs years later with the 2-step rods.

The '256 carb was used on manual W-30s. It will have .058 primary jets with NO primary metering rods. Smaller jet than the automatic, but nothiing plugging the hole. Obviously built for track use.

stevengerard

looks like an 8 to me as well - another great find

joe_padavano

Pretty easy to tell if it's a 6 or an 8. If it has primary metering rods, it's an 8. No rods, it's a 6.

jensenracing77

I just pulled the top. It is a 7040256.

No primary rods
primary jets are 58
secondary hanger G
secondary rods AU

Now I am faced with a dilemma. Do I find an original? I thought about it and I know I am not going to build this one for the car. If it is not going to be a correct number carburetor I will have Sparky rebuild my 0257 carb for it.