caddy 800 cfm?

[msc66]

Would a '70 Caddy with a 500 have come with a 800 cfm (7040230) q-jet?
All the sites I have found only give the application not the cfm rating.

Thanks

[Smartin]

You need to look for the 800 cfm "bump"....

There is a good picture of hte bump in this thread:

http://www.v8buick.com/showthread.php?t=63419&highlight=800+cfm+bump

[msc66]

Yeh Adam, I'm familiar with the bump but I don't have the carb in my posession. Thought someone might know this off the top of their head.

Thanks

[LARRY70GS]

Yeh Adam, I'm familiar with the bump but I don't have the carb in my posession. Thought someone might know this off the top of their head.

Thanks

Mike,
I think they started using the 800's in 1971 on certain engines, so I would guess that even a 70 Caddilac would have a 750. If you know anyone with a 70 Caddilac chassis manual, or can lay your hands on one, take a look in the carb section. They have the specs for the different carbs by part #. Look at the outer (Large) venturi size, 1 3/32", for the 750, 1 7/32" for the 800, thats a 1/8" difference.

[TORQUED455]

The only Qjets, to the best of my knowledge, that are 800 cfm are 71-73 455 Buicks and some 73 Pontiac 455's.

[Nicholas Sloop]

The only Qjets, to the best of my knowledge, that are 800 cfm are 71-73 455 Buicks and some 73 Pontiac 455's.

74 Buick 455 7044240 is deffinitely 800cfm (I've got one and I'm well versed in the difference.)

[msc66]

We've determined that the Caddy carb is a 750. Its always been my understanding that the Buicks had 800s from '71 thru '76.